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Solar power

December 15, 2023

This article is about the conversion of energy from sunlight into electricity. For a broader range of human uses for sunlight, see Solar energy. For the unit of light from stars and galaxies, see Solar luminosity.
For other uses, see Solar Power.

Solar power, also known as solar electricity, is the conversion of energy from sunlight into electricity, either directly using photovoltaics (PV) or indirectly using concentrated solar power. Photovoltaic cells convert light into an electric current using the photovoltaic effect.[2] Concentrated solar power systems use lenses or mirrors and solar tracking systems to focus a large area of sunlight to a hot spot, often to drive a steam turbine.

A solar photovoltaic system array on a rooftop in Hong Kong
The first three concentrated solar power (CSP) units of Spain's Solnova Solar Power Station in the foreground, with the PS10 and PS20 solar power towers in the background
Estimated solar energy available for power generation. The map shows the average daily/yearly sum of electricity production from a 1 kW-peak grid-connected solar PV power plant covering the period from 1994/1999/2007 (depending on the geographical region) to 2018.[1]

Photovoltaics were initially solely used as a source of electricity for small and medium-sized applications, from the calculator powered by a single solar cell to remote homes powered by an off-grid rooftop PV system. Commercial concentrated solar power plants were first developed in the 1980s. Since then, as the cost of solar electricity has fallen, grid-connected solar PV systems' capacity and production have grown more or less exponentially, doubling about every three years. Millions of installations and gigawatt-scale photovoltaic power stations continue to be built, with half of the new generation capacity being solar in 2021.[3]

In 2022, solar generated 4.5% of the world's electricity,[4] compared to 1% in 2015, when the Paris Agreement to limit climate change was signed.[5] Along with onshore wind, in most countries, the cheapest levelised cost of electricity for new installations is utility-scale solar.[6][7]

Almost half the solar power installed in 2022 was rooftop.[4] Low-carbon power has been recommended as part of a plan to limit climate change. The International Energy Agency said in 2022 that more effort was needed for grid integration and the mitigation of policy, regulation and financing challenges.[8]

Potential

Geography affects solar energy potential because different locations receive different amounts of solar radiation. In particular, with some variations, areas that are closer to the equator generally receive higher amounts of solar radiation. However, the use of photovoltaics that can follow the position of the Sun can significantly increase the solar energy potential in areas that are farther from the equator.[9] Time variation affects the potential of solar energy, because during the night there is little solar radiation on the surface of the Earth for solar panels to absorb. This limits the amount of energy that solar panels can absorb in one day. Cloud cover can affect the potential of solar panels because clouds block incoming light from the Sun and reduce the light available for solar cells.

Besides, land availability has a large effect on the available solar energy because solar panels can only be set up on land that is otherwise unused and suitable for solar panels. Roofs are a suitable place for solar cells, as many people have discovered that they can collect energy directly from their homes this way. Other areas that are suitable for solar cells are lands that are not being used for businesses, where solar plants can be established.[9]

Technologies

Solar power plants use one of two technologies:

Photovoltaic cells

Main articles: Photovoltaics and Solar cell
 
Schematics of a grid-connected residential PV power system[10]

A solar cell, or photovoltaic cell, is a device that converts light into electric current using the photovoltaic effect. The first solar cell was constructed by Charles Fritts in the 1880s.[11] The German industrialist Ernst Werner von Siemens was among those who recognized the importance of this discovery.[12] In 1931, the German engineer Bruno Lange developed a photo cell using silver selenide in place of copper oxide,[13] although the prototype selenium cells converted less than 1% of incident light into electricity. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the silicon solar cell in 1954.[14] These early solar cells cost US$286/watt and reached efficiencies of 4.5–6%.[15] In 1957, Mohamed M. Atalla developed the process of silicon surface passivation by thermal oxidation at Bell Labs.[16][17] The surface passivation process has since been critical to solar cell efficiency.[18]

As of 2022 over 90% of the market is crystalline silicon.[19] The array of a photovoltaic system, or PV system, produces direct current (DC) power which fluctuates with the sunlight's intensity. For practical use this usually requires conversion to alternating current (AC), through the use of inverters.[10] Multiple solar cells are connected inside panels. Panels are wired together to form arrays, then tied to an inverter, which produces power at the desired voltage, and for AC, the desired frequency/phase.[10]

Many residential PV systems are connected to the grid wherever available, especially in developed countries with large markets.[20] In these grid-connected PV systems, use of energy storage is optional. In certain applications such as satellites, lighthouses, or in developing countries, batteries or additional power generators are often added as back-ups. Such stand-alone power systems permit operations at night and at other times of limited sunlight.

Thin-film solar

Main article: Thin-film solar cell

A thin-film solar cell is a second generation solar cell that is made by depositing one or more thin layers, or thin film (TF) of photovoltaic material on a substrate, such as glass, plastic or metal. Thin-film solar cells are commercially used in several technologies, including cadmium telluride (CdTe), copper indium gallium diselenide (CIGS), and amorphous thin-film silicon (a-Si, TF-Si).[21]

Perovskite solar cells

This section is an excerpt from Perovskite solar cell.[edit]

A perovskite solar cell (PSC) is a type of solar cell that includes a perovskite-structured compound, most commonly a hybrid organic–inorganic lead or tin halide-based material as the light-harvesting active layer.[22][23] Perovskite materials, such as methylammonium lead halides and all-inorganic cesium lead halide, are cheap to produce and simple to manufacture.

Solar-cell efficiencies of laboratory-scale devices using these materials have increased from 3.8% in 2009[24] to 25.7% in 2021 in single-junction architectures,[25][26] and, in silicon-based tandem cells, to 29.8%,[25][27] exceeding the maximum efficiency achieved in single-junction silicon solar cells. Perovskite solar cells have therefore been the fastest-advancing solar technology as of 2016.[22] With the potential of achieving even higher efficiencies and very low production costs, perovskite solar cells have become commercially attractive. Core problems and research subjects include their short- and long-term stability.[28]

Concentrated solar power

 
A parabolic collector concentrates sunlight onto a tube in its focal point.
Main article: Concentrated solar power

Concentrated solar power (CSP), also called "concentrated solar thermal", uses lenses or mirrors and tracking systems to concentrate sunlight, then use the resulting heat to generate electricity from conventional steam-driven turbines.[29]

A wide range of concentrating technologies exists among the best known are the parabolic trough, the compact linear Fresnel reflector, the dish Stirling and the solar power tower. Various techniques are used to track the sun and focus light. In all of these systems a working fluid is heated by the concentrated sunlight and is then used for power generation or energy storage.[30] Thermal storage efficiently allows overnight electricity generation,[31] thus complementing PV.[32] CSP generates a very small share of solar power and in 2022 the IEA said that CSP should be better paid for its storage.[33]

As of 2021 the levelized cost of electricity from CSP is over twice that of PV.[34] However, their very high temperatures may prove useful to help decarbonize industries (perhaps via hydrogen) which need to be hotter than electricity can provide.[35]

Hybrid systems

Main article: Hybrid power

A hybrid system combines solar with energy storage and/or one or more other forms of generation. Hydro,[36][37] wind[38][39] and batteries[40] are commonly combined with solar. The combined generation may enable the system to vary power output with demand, or at least smooth the solar power fluctuation.[41][42] There is a lot of hydro worldwide, and adding solar panels on or around existing hydro reservoirs is particularly useful, because hydro is usually more flexible than wind and cheaper at scale than batteries,[43] and existing power lines can sometimes be used.[44][45]

Development and deployment

See also: Growth of photovoltaics, Timeline of solar cells, Solar power by country, and Concentrated solar power § Deployment around the world
 
The share of electricity production from solar, 2022[46]
 
The evolution of solar power production by region
 
Benefitting from favorable policies and declining costs of modules, photovoltaic solar installation has grown consistently, with China expected to account for 50% of new global solar photovoltaic projects by 2024.[47][48]
 
The growth of solar PV on a semi-log scale since 1996
 
Electricity production by source

Early days

The early development of solar technologies starting in the 1860s was driven by an expectation that coal would soon become scarce, such as experiments by Augustin Mouchot.[49] Charles Fritts installed the world's first rooftop photovoltaic solar array, using 1%-efficient selenium cells, on a New York City roof in 1884.[50] However, development of solar technologies stagnated in the early 20th century in the face of the increasing availability, economy, and utility of coal and petroleum.[51] Bell Telephone Laboratories’ 1950s research used silicon wafers with a very thin coating of boron. The “Bell Solar Battery” was described as 6% efficient, with a square yard of the panels generating 50 watts.[52] The first satellite with solar panels was launched in 1957.[53]

By the 1970s, solar power was being used on satellites, but the cost of solar power was considered to be unrealistic for conventional applications.[54] In 1974 it was estimated that only six private homes in all of North America were entirely heated or cooled by functional solar power systems.[55] However, the 1973 oil embargo and 1979 energy crisis caused a reorganization of energy policies around the world and brought renewed attention to developing solar technologies.[56][57]

Deployment strategies focused on incentive programs such as the Federal Photovoltaic Utilization Program in the US and the Sunshine Program in Japan. Other efforts included the formation of research facilities in the United States (SERI, now NREL), Japan (NEDO), and Germany (Fraunhofer ISE).[58] Between 1970 and 1983 installations of photovoltaic systems grew rapidly. In the United States, President Jimmy Carter set a target of producing 20% of U.S. energy from solar by the year 2000, but his successor, Ronald Reagan, removed the funding for research into renewables.[54] Falling oil prices in the early 1980s moderated the growth of photovoltaics from 1984 to 1996.

Mid-1990s to 2010

In the mid-1990s development of both, residential and commercial rooftop solar as well as utility-scale photovoltaic power stations began to accelerate again due to supply issues with oil and natural gas, global warming concerns, and the improving economic position of PV relative to other energy technologies.[54][59] In the early 2000s, the adoption of feed-in tariffs—a policy mechanism, that gives renewables priority on the grid and defines a fixed price for the generated electricity—led to a high level of investment security and to a soaring number of PV deployments in Europe.

2010s

For several years, worldwide growth of solar PV was driven by European deployment, but it has since shifted to Asia, especially China and Japan, and to a growing number of countries and regions all over the world. The largest manufacturers of solar equipment were based in China.[60][61] Although concentrated solar power capacity grew more than tenfold, it remained a tiny proportion of the total,[62]: 51  because the cost of utility-scale solar PV fell by 85% between 2010 and 2020, while CSP costs have only fallen 68% in the same timeframe.[63]

2020s

Despite the rising cost of materials, such as polysilicon, during the 2021–2022 global energy crisis,[64] utility scale solar was still the cheapest energy source in many countries due to the rising costs of other energy sources, such as natural gas.[65] In 2022, global solar generation capacity exceeded 1 TW for the first time.[66] However, fossil-fuel subsidies have slowed the growth of solar generation capacity.[67]

Current status

About half of installed capacity is utility scale.[68]

Forecasts

 
Actual annual deployments of solar PV vs predictions by the IEA for the period 2002–2016. Predictions have largely and consistently underestimated actual growth.

Most new renewable capacity between 2022 and 2027 is forecast to be solar, surpassing coal as the largest source of installed power capacity.[69]: 26  Utility scale is forecast to become the largest source of electricity in all regions except sub-Saharan Africa by 2050.[68]

According to a 2021 study, global electricity generation potential of rooftop solar panels is estimated at 27 PWh per year at costs ranging from $40 (Asia) to $240 per MWh (US, Europe). Its practical realization will however depend on the availability and cost of scalable electricity storage solutions.[70]

Photovoltaic power stations

See also: List of photovoltaic power stations
This section is an excerpt from Photovoltaic power station.[edit]
 
The 40.5 MW Jännersdorf Solar Park in Prignitz, Germany

A photovoltaic power station, also known as a solar park, solar farm, or solar power plant, is a large-scale grid-connected photovoltaic power system (PV system) designed for the supply of merchant power. They are different from most building-mounted and other decentralized solar power because they supply power at the utility level, rather than to a local user or users. Utility-scale solar is sometimes used to describe this type of project.

This approach differs from concentrated solar power, the other major large-scale solar generation technology, which uses heat to drive a variety of conventional generator systems. Both approaches have their own advantages and disadvantages, but to date, for a variety of reasons, photovoltaic technology has seen much wider use. As of 2019, about 97% of utility-scale solar power capacity was PV.[71][72]

In some countries, the nameplate capacity of photovoltaic power stations is rated in megawatt-peak (MWp), which refers to the solar array's theoretical maximum DC power output. In other countries, the manufacturer states the surface and the efficiency. However, Canada, Japan, Spain, and the United States often specify using the converted lower nominal power output in MWAC, a measure more directly comparable to other forms of power generation. Most solar parks are developed at a scale of at least 1 MWp. As of 2018, the world's largest operating photovoltaic power stations surpassed 1 gigawatt. At the end of 2019, about 9,000 solar farms were larger than 4 MWAC (utility scale), with a combined capacity of over 220 GWAC.[71]

Most of the existing large-scale photovoltaic power stations are owned and operated by independent power producers, but the involvement of community and utility-owned projects is increasing.[73] Previously, almost all were supported at least in part by regulatory incentives such as feed-in tariffs or tax credits, but as levelized costs fell significantly in the 2010s and grid parity has been reached in most markets, external incentives are usually not needed.

Concentrating solar power stations

Main article: List of solar thermal power stations
 
Ivanpah Solar Electric Generating System with all three towers under load during February 2014, with the Clark Mountain Range seen in the distance
 
Part of the 354 MW Solar Energy Generating Systems (SEGS) parabolic trough solar complex in northern San Bernardino County, California

Commercial concentrating solar power (CSP) plants, also called "solar thermal power stations", were first developed in the 1980s. The 377  MW Ivanpah Solar Power Facility, located in California's Mojave Desert, is the world's largest solar thermal power plant project. Other large CSP plants include the Solnova Solar Power Station (150 MW), the Andasol solar power station (150 MW), and Extresol Solar Power Station (150 MW), all in Spain. The principal advantage of CSP is the ability to efficiently add thermal storage, allowing the dispatching of electricity over up to a 24-hour period. Since peak electricity demand typically occurs at about 5 pm, many CSP power plants use 3 to 5 hours of thermal storage.[74]

Economics

See also: Photovoltaic power station § Economics and finance

Cost per watt

The typical cost factors for solar power include the costs of the modules, the frame to hold them, wiring, inverters, labour cost, any land that might be required, the grid connection, maintenance and the solar insolation that location will receive.

Photovoltaic systems use no fuel, and modules typically last 25 to 40 years.[75] Thus upfront capital and financing costs make up 80 to 90% of the cost of solar power.[69]: 165 

Some countries are considering price caps,[76] whereas others prefer contracts for difference.[77]

The large magnitude of solar energy available makes it a highly appealing source of electricity. In 2020, solar energy was the cheapest source of electricity.[78][79] In Saudi Arabia, a power purchase agreement (PPA) was signed in April 2021 for a new solar power plant in Al-Faisaliah. The project has recorded the world's lowest cost for solar PV electricity production of USD 1.04 cents/ kWh.[80]

Installation prices

Expenses of high-power band solar modules has greatly decreased over time. Beginning in 1982, the cost per kW was approximately 27,000 American dollars, and in 2006 the cost dropped to approximately 4,000 American dollars per kW. The PV system in 1992 cost approximately 16,000 American dollars per kW and it dropped to approximately 6,000 American dollars per kW in 2008.[81]

In 2021 in the US, residential solar cost from 2 to 4 dollars/watt (but solar shingles cost much more)[82] and utility solar costs were around $1/watt.[83]

Productivity by location

See also: Solar irradiance

The productivity of solar power in a region depends on solar irradiance, which varies through the day and year and is influenced by latitude and climate. PV system output power also depends on ambient temperature, wind speed, solar spectrum, the local soiling conditions, and other factors.

Onshore wind power tends to be the cheapest source of electricity in Northern Eurasia, Canada, some parts of the United States, and Patagonia in Argentina: whereas in other parts of the world mostly solar power (or less often a combination of wind, solar and other low carbon energy) is thought to be best.[84]: 8  Modelling by Exeter University suggests that by 2030 solar will be cheapest in all countries except for some in north-east Europe.[85]

The locations with highest annual solar irradiance lie in the arid tropics and subtropics. Deserts lying in low latitudes usually have few clouds and can receive sunshine for more than ten hours a day.[86][87] These hot deserts form the Global Sun Belt circling the world. This belt consists of extensive swathes of land in Northern Africa, Southern Africa, Southwest Asia, Middle East, and Australia, as well as the much smaller deserts of North and South America.[88]

So solar is (or is predicted to become) the cheapest source of energy in all of Central America, Africa, the Middle East, India, South-east Asia, Australia, and several other places.[84]: 8 

Different measurements of solar irradiance (direct normal irradiance, global horizontal irradiance) are mapped below:

  •  
    North America
  •  
    South America
  •  
    Europe
  •  
    Africa and Middle East
  •  
    South and South-East Asia
  •  
    Australia
  •  
    World

Self-consumption

In cases of self-consumption of solar energy, the payback time is calculated based on how much electricity is not purchased from the grid.[89] However, in many cases, the patterns of generation and consumption do not coincide, and some or all of the energy is fed back into the grid. The electricity is sold, and at other times when energy is taken from the grid, electricity is bought. The relative costs and prices obtained affect the economics. In many markets, the price paid for sold PV electricity is significantly lower than the price of bought electricity, which incentivizes self-consumption.[90] Moreover, separate self-consumption incentives have been used in e.g., Germany and Italy.[90] Grid interaction regulation has also included limitations of grid feed-in in some regions in Germany with high amounts of installed PV capacity.[90][91] By increasing self-consumption, the grid feed-in can be limited without curtailment, which wastes electricity.[92]

A good match between generation and consumption is key for high self-consumption. The match can be improved with batteries or controllable electricity consumption.[92] However, batteries are expensive, and profitability may require the provision of other services from them besides self-consumption increase,[93] for example avoiding power outages.[94] Hot water storage tanks with electric heating with heat pumps or resistance heaters can provide low-cost storage for self-consumption of solar power.[92] Shiftable loads, such as dishwashers, tumble dryers and washing machines, can provide controllable consumption with only a limited effect on the users, but their effect on self-consumption of solar power may be limited.[92]

Energy pricing, incentives and taxes

Main article: PV financial incentives

The original political purpose of incentive policies for PV was to facilitate an initial small-scale deployment to begin to grow the industry, even where the cost of PV was significantly above grid parity, to allow the industry to achieve the economies of scale necessary to reach grid parity. Since reaching grid parity some policies are implemented to promote national energy independence,[95] high tech job creation[96] and reduction of CO2 emissions.[95]

Financial incentives for photovoltaics differ across countries, including Australia,[97] China,[98] Germany,[99] India,[100] Japan, and the United States and even across states within the US.

Net metering

 
Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional.

In net metering the price of the electricity produced is the same as the price supplied to the consumer, and the consumer is billed on the difference between production and consumption. Net metering can usually be done with no changes to standard electricity meters, which accurately measure power in both directions and automatically report the difference, and because it allows homeowners and businesses to generate electricity at a different time from consumption, effectively using the grid as a giant storage battery. With net metering, deficits are billed each month while surpluses are rolled over to the following month. Best practices call for perpetual roll over of kWh credits.[101] Excess credits upon termination of service are either lost or paid for at a rate ranging from wholesale to retail rate or above, as can be excess annual credits.[102]

Community solar

 
Community solar farm in the town of Wheatland, Wisconsin[103]

A community solar project is a solar power installation that accepts capital from and provides output credit and tax benefits to multiple customers, including individuals, businesses, nonprofits, and other investors. Participants typically invest in or subscribe to a certain kW capacity or kWh generation of remote electrical production.[68]

Taxes

In some countries tariffs (import taxes) are imposed on imported solar panels.[104][105]

Grid integration

Main articles: Energy storage and Grid energy storage
 
Construction of the Salt Tanks which provide efficient thermal energy storage[106] so that output can be provided after sunset, and output can be scheduled to meet demand requirements.[107] The 280 MW Solana Generating Station is designed to provide six hours of energy storage. This allows the plant to generate about 38% of its rated capacity over the course of a year.[108]
 
Thermal energy storage. The Andasol CSP plant uses tanks of molten salt to store solar energy.
 
Pumped-storage hydroelectricity (PSH). This facility in Geesthacht, Germany, also includes a solar array.

Variability

The overwhelming majority of electricity produced worldwide is used immediately because traditional generators can adapt to demand and storage is usually more expensive. Both solar power and wind power are sources of variable renewable power, meaning that all available output must be used locally, carried on transmission lines to be used elsewhere, or stored (e.g., in a battery). Since solar energy is not available at night, storing it so as to have continuous electricity availability is potentially an important issue, particularly in off-grid applications and for future 100% renewable energy scenarios.[109]

Solar electricity is inherently variable but somewhat predictable by time of day, location, and seasons (see solar power forecasting). Solar is intermittent due to the day/night cycles and variable weather conditions. The challenge of integrating solar power in any given electric utility varies significantly. In places with hot summers and mild winters, solar is well matched to daytime cooling demands.[110]

Energy storage

Concentrated solar power plants may use thermal storage to store solar energy, such as in high-temperature molten salts. These salts are an effective storage medium because they are low-cost, have a high specific heat capacity, and can deliver heat at temperatures compatible with conventional power systems. This method of energy storage is used, for example, by the Solar Two power station, allowing it to store 1.44 TJ in its 68 m3 storage tank, enough to provide full output for close to 39 hours, with an efficiency of about 99%.[111]

In stand alone PV systems batteries are traditionally used to store excess electricity. With grid-connected photovoltaic power systems, excess electricity can be sent to the electrical grid. Net metering and feed-in tariff programs give these systems a credit for the electricity they produce. This credit offsets electricity provided from the grid when the system cannot meet demand, effectively trading with the grid instead of storing excess electricity.[112] When wind and solar are a small fraction of the grid power, other generation techniques can adjust their output appropriately, but as these forms of variable power grow, additional balance on the grid is needed. As prices are rapidly declining, PV systems increasingly use rechargeable batteries to store a surplus to be used later at night. Batteries used for grid-storage can stabilize the electrical grid by leveling out peak loads for a few hours. In the future, less expensive batteries could play an important role on the electrical grid, as they can charge during periods when generation exceeds demand and feed their stored energy into the grid when demand is higher than generation.

Common battery technologies used in today's home PV systems include nickel-cadmium, lead-acid, nickel metal hydride, and lithium-ion.[113][114][better source needed]Lithium-ion batteries have the potential to replace lead-acid batteries in the near future, as they are being intensively developed and lower prices are expected due to economies of scale provided by large production facilities such as the Gigafactory 1. In addition, the Li-ion batteries of plug-in electric cars may serve as future storage devices in a vehicle-to-grid system. Since most vehicles are parked an average of 95% of the time, their batteries could be used to let electricity flow from the car to the power lines and back. Other rechargeable batteries used for distributed PV systems include, sodium–sulfur and vanadium redox batteries, two prominent types of a molten salt and a flow battery, respectively.[115][116][117]

 
Seasonal cycle of capacity factors for wind and photovoltaics in Europe under idealized assumptions. The figure illustrates the balancing effects of wind and solar energy at the seasonal scale (Kaspar et al., 2019).[118]

Other technologies

Solar power plants, while they can be curtailed, usually simply output as much power as possible. Therefore in an electricity system without sufficient grid energy storage, generation from other sources (coal, biomass, natural gas, nuclear, hydroelectricity) generally go up and down in reaction to the rise and fall of solar electricity and variations in demand (see load following power plant).

Conventional hydroelectric dams work very well in conjunction with solar power; water can be held back or released from a reservoir as required. Where suitable geography is not available, pumped-storage hydroelectricity can use solar power to pump water to a high reservoir on sunny days, then the energy is recovered at night and in bad weather by releasing water via a hydroelectric plant to a low reservoir where the cycle can begin again.[119]

While hydroelectric and natural gas plants can quickly respond to changes in load; coal, biomass and nuclear plants usually take considerable time to respond to load and can only be scheduled to follow the predictable variation. Depending on local circumstances, beyond about 20–40% of total generation, grid-connected intermittent sources like solar tend to require investment in some combination of grid interconnections, energy storage or demand side management. In countries with high solar generation, such as Australia, electricity prices may become negative in the middle of the day when solar generation is high, thus incentivizing new battery storage.[120][121]

The combination of wind and solar PV has the advantage that the two sources complement each other because the peak operating times for each system occur at different times of the day and year.[122] The power generation of such solar hybrid power systems is therefore more constant and fluctuates less than each of the two component subsystems.[123] Solar power is seasonal, particularly in northern/southern climates, away from the equator, suggesting a need for long term seasonal storage in a medium such as hydrogen or pumped hydroelectric.[124]

Environmental effects

Further information: Concentrated_solar_power § Environmental_effects
 
Greenhouse gas emissions per energy source. Solar power is one of the sources with the least greenhouse gas emissions.
 
Part of the Senftenberg Solarpark, a solar photovoltaic power plant located on former open-pit mining areas close to the city of Senftenberg, in Eastern Germany. The 78 MW Phase 1 of the plant was completed within three months.

Solar power is cleaner than electricity from fossil fuels,[19] so can be good for the environment when it replaces that.[125] Solar power does not lead to any harmful emissions during operation, but the production of the panels leads to some amount of pollution. A 2021 study estimated the carbon footprint of manufacturing monocrystalline panels at 515 g CO2/kWp in the US and 740 g CO2/kWp in China,[126] but this is expected to fall as manufacturers use more clean electricity and recycled materials.[127] Solar power carries an upfront cost to the environment via production with a carbon payback time of several years as of 2022,[127] but offers clean energy for the remainder of their 30-year lifetime.[128]

The life-cycle greenhouse-gas emissions of solar farms are less than 50 gram (g) per kilowatt-hour (kWh),[129][130][131] but with battery storage could be up to 150 g/kWh.[132] In contrast, a combined cycle gas-fired power plant without carbon capture and storage emits around 500 g/kWh, and a coal-fired power plant about 1000 g/kWh.[133] Similar to all energy sources where their total life cycle emissions are mostly from construction, the switch to low carbon power in the manufacturing and transportation of solar devices would further reduce carbon emissions.[131]

Lifecycle surface power density of solar power varies a lot[134] but averages about 7 W/m2, compared to about 240 for nuclear power and 480 for gas.[135] However when the land required for gas extraction and processing is accounted for gas power is estimated to have not much higher power density than solar.[19] PV requires much larger amounts of land surface to produce the same nominal amount of energy as sources[which?] with higher surface power density and capacity factor. According to a 2021 study, obtaining 25 to 80% of electricity from solar farms in their own territory by 2050 would require the panels to cover land ranging from 0.5 to 2.8% of the European Union, 0.3 to 1.4% in India, and 1.2 to 5.2% in Japan and South Korea.[136] Occupation of such large areas for PV farms could drive residential opposition as well as lead to deforestation, removal of vegetation and conversion of farm land.[137] However some countries, such as South Korea and Japan, use land for agriculture under PV,[138][139] or floating solar,[140] together with other low-carbon power sources.[141][142] Worldwide land use has minimal ecological impact.[143] Land use can be reduced to the level of gas power by installing on buildings and other built up areas.[134]

Harmful materials are used in the production of solar panels, but in generally in small amounts.[144] As of 2022 the environmental impact of perovskite is hard to estimate, but there is some concern that lead may become a problem.[19] A 2021 International Energy Agency study projects the demand for copper will double by 2040. The study cautions that supply needs to increase rapidly to match demand from large-scale deployment of solar and required grid upgrades.[145][146] More tellurium and indium may also be needed and recycling may help.[19]

As solar panels are sometimes replaced with more efficient panels, the second-hand panels are sometimes reused in developing countries, for example in Africa.[147] Several countries have specific regulations for the recycling of solar panels.[148][149][150] Although maintenance cost is already low compared to other energy sources,[151] some academics have called for solar power systems to be designed to be more repairable.[152][153]

A very small proportion of solar power is concentrated solar power. Concentrated solar power may use much more water than gas-fired power. This can be a problem, as this type of solar power needs strong sunlight so is often built in deserts.[154]

Politics

 
Acceptance of wind and solar facilities in one's community is stronger among U.S. Democrats (blue), while acceptance of nuclear power plants is stronger among U.S. Republicans (red).[155]

Solar production cannot be cut off by geopolitics once installed, unlike oil and gas, which contributes to energy security.[156]

As of 2022 over 40% of global polysilicon manufacturing capacity is in Xinjiang in China,[157] which raises concerns about human rights violations (Xinjiang internment camps) as well as supply chain dependency.[158]

See also

References

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Bibliography

  • Perlin, John (1999). From space to Earth: the story of solar electricity. Earthscan. p. 50. ISBN 978-0-937948-14-9.

Further reading

  • Sivaram, Varun (2018). Taming the Sun: Innovation to Harness Solar Energy and Power the Planet. Cambridge, MA: MIT Press. ISBN 978-0-262-03768-6.

External links

 
Wikimedia Commons has media related to Solar power.

December 15, 2023
solar, power, this, article, about, conversion, energy, from, sunlight, into, electricity, broader, range, human, uses, sunlight, solar, energy, unit, light, from, stars, galaxies, solar, luminosity, other, uses, solar, power, also, known, solar, electricity, . This article is about the conversion of energy from sunlight into electricity For a broader range of human uses for sunlight see Solar energy For the unit of light from stars and galaxies see Solar luminosity For other uses see Solar Power Solar power also known as solar electricity is the conversion of energy from sunlight into electricity either directly using photovoltaics PV or indirectly using concentrated solar power Photovoltaic cells convert light into an electric current using the photovoltaic effect 2 Concentrated solar power systems use lenses or mirrors and solar tracking systems to focus a large area of sunlight to a hot spot often to drive a steam turbine A solar photovoltaic system array on a rooftop in Hong KongThe first three concentrated solar power CSP units of Spain s Solnova Solar Power Station in the foreground with the PS10 and PS20 solar power towers in the backgroundEstimated solar energy available for power generation The map shows the average daily yearly sum of electricity production from a 1 kW peak grid connected solar PV power plant covering the period from 1994 1999 2007 depending on the geographical region to 2018 1 Photovoltaics were initially solely used as a source of electricity for small and medium sized applications from the calculator powered by a single solar cell to remote homes powered by an off grid rooftop PV system Commercial concentrated solar power plants were first developed in the 1980s Since then as the cost of solar electricity has fallen grid connected solar PV systems capacity and production have grown more or less exponentially doubling about every three years Millions of installations and gigawatt scale photovoltaic power stations continue to be built with half of the new generation capacity being solar in 2021 3 In 2022 solar generated 4 5 of the world s electricity 4 compared to 1 in 2015 when the Paris Agreement to limit climate change was signed 5 Along with onshore wind in most countries the cheapest levelised cost of electricity for new installations is utility scale solar 6 7 Almost half the solar power installed in 2022 was rooftop 4 Low carbon power has been recommended as part of a plan to limit climate change The International Energy Agency said in 2022 that more effort was needed for grid integration and the mitigation of policy regulation and financing challenges 8 Contents 1 Potential 2 Technologies 2 1 Photovoltaic cells 2 1 1 Thin film solar 2 1 2 Perovskite solar cells 2 2 Concentrated solar power 2 3 Hybrid systems 3 Development and deployment 3 1 Early days 3 2 Mid 1990s to 2010 3 3 2010s 3 4 2020s 3 5 Current status 3 6 Forecasts 3 7 Photovoltaic power stations 3 8 Concentrating solar power stations 4 Economics 4 1 Cost per watt 4 2 Installation prices 4 3 Productivity by location 4 4 Self consumption 4 5 Energy pricing incentives and taxes 4 5 1 Net metering 4 5 2 Community solar 4 5 3 Taxes 5 Grid integration 5 1 Variability 5 2 Energy storage 5 3 Other technologies 6 Environmental effects 7 Politics 8 See also 9 References 10 Bibliography 11 Further reading 12 External linksPotentialGeography affects solar energy potential because different locations receive different amounts of solar radiation In particular with some variations areas that are closer to the equator generally receive higher amounts of solar radiation However the use of photovoltaics that can follow the position of the Sun can significantly increase the solar energy potential in areas that are farther from the equator 9 Time variation affects the potential of solar energy because during the night there is little solar radiation on the surface of the Earth for solar panels to absorb This limits the amount of energy that solar panels can absorb in one day Cloud cover can affect the potential of solar panels because clouds block incoming light from the Sun and reduce the light available for solar cells Besides land availability has a large effect on the available solar energy because solar panels can only be set up on land that is otherwise unused and suitable for solar panels Roofs are a suitable place for solar cells as many people have discovered that they can collect energy directly from their homes this way Other areas that are suitable for solar cells are lands that are not being used for businesses where solar plants can be established 9 TechnologiesSolar power plants use one of two technologies Photovoltaic PV systems use solar panels either on rooftops or in ground mounted solar farms converting sunlight directly into electric power Concentrated solar power CSP uses mirrors or lenses to concentrate sunlight to extreme heat to eventually make steam which is converted into electricity by a turbine Photovoltaic cells Main articles Photovoltaics and Solar cell nbsp Schematics of a grid connected residential PV power system 10 A solar cell or photovoltaic cell is a device that converts light into electric current using the photovoltaic effect The first solar cell was constructed by Charles Fritts in the 1880s 11 The German industrialist Ernst Werner von Siemens was among those who recognized the importance of this discovery 12 In 1931 the German engineer Bruno Lange developed a photo cell using silver selenide in place of copper oxide 13 although the prototype selenium cells converted less than 1 of incident light into electricity Following the work of Russell Ohl in the 1940s researchers Gerald Pearson Calvin Fuller and Daryl Chapin created the silicon solar cell in 1954 14 These early solar cells cost US 286 watt and reached efficiencies of 4 5 6 15 In 1957 Mohamed M Atalla developed the process of silicon surface passivation by thermal oxidation at Bell Labs 16 17 The surface passivation process has since been critical to solar cell efficiency 18 As of 2022 update over 90 of the market is crystalline silicon 19 The array of a photovoltaic system or PV system produces direct current DC power which fluctuates with the sunlight s intensity For practical use this usually requires conversion to alternating current AC through the use of inverters 10 Multiple solar cells are connected inside panels Panels are wired together to form arrays then tied to an inverter which produces power at the desired voltage and for AC the desired frequency phase 10 Many residential PV systems are connected to the grid wherever available especially in developed countries with large markets 20 In these grid connected PV systems use of energy storage is optional In certain applications such as satellites lighthouses or in developing countries batteries or additional power generators are often added as back ups Such stand alone power systems permit operations at night and at other times of limited sunlight Thin film solar Main article Thin film solar cell A thin film solar cell is a second generation solar cell that is made by depositing one or more thin layers or thin film TF of photovoltaic material on a substrate such as glass plastic or metal Thin film solar cells are commercially used in several technologies including cadmium telluride CdTe copper indium gallium diselenide CIGS and amorphous thin film silicon a Si TF Si 21 Perovskite solar cells This section is an excerpt from Perovskite solar cell edit A perovskite solar cell PSC is a type of solar cell that includes a perovskite structured compound most commonly a hybrid organic inorganic lead or tin halide based material as the light harvesting active layer 22 23 Perovskite materials such as methylammonium lead halides and all inorganic cesium lead halide are cheap to produce and simple to manufacture Solar cell efficiencies of laboratory scale devices using these materials have increased from 3 8 in 2009 24 to 25 7 in 2021 in single junction architectures 25 26 and in silicon based tandem cells to 29 8 25 27 exceeding the maximum efficiency achieved in single junction silicon solar cells Perovskite solar cells have therefore been the fastest advancing solar technology as of 2016 update 22 With the potential of achieving even higher efficiencies and very low production costs perovskite solar cells have become commercially attractive Core problems and research subjects include their short and long term stability 28 Concentrated solar power nbsp A parabolic collector concentrates sunlight onto a tube in its focal point Main article Concentrated solar power Concentrated solar power CSP also called concentrated solar thermal uses lenses or mirrors and tracking systems to concentrate sunlight then use the resulting heat to generate electricity from conventional steam driven turbines 29 A wide range of concentrating technologies exists among the best known are the parabolic trough the compact linear Fresnel reflector the dish Stirling and the solar power tower Various techniques are used to track the sun and focus light In all of these systems a working fluid is heated by the concentrated sunlight and is then used for power generation or energy storage 30 Thermal storage efficiently allows overnight electricity generation 31 thus complementing PV 32 CSP generates a very small share of solar power and in 2022 the IEA said that CSP should be better paid for its storage 33 As of 2021 update the levelized cost of electricity from CSP is over twice that of PV 34 However their very high temperatures may prove useful to help decarbonize industries perhaps via hydrogen which need to be hotter than electricity can provide 35 Hybrid systems Main article Hybrid power A hybrid system combines solar with energy storage and or one or more other forms of generation Hydro 36 37 wind 38 39 and batteries 40 are commonly combined with solar The combined generation may enable the system to vary power output with demand or at least smooth the solar power fluctuation 41 42 There is a lot of hydro worldwide and adding solar panels on or around existing hydro reservoirs is particularly useful because hydro is usually more flexible than wind and cheaper at scale than batteries 43 and existing power lines can sometimes be used 44 45 Development and deploymentSee also Growth of photovoltaics Timeline of solar cells Solar power by country and Concentrated solar power Deployment around the world nbsp The share of electricity production from solar 2022 46 nbsp The evolution of solar power production by region nbsp Benefitting from favorable policies and declining costs of modules photovoltaic solar installation has grown consistently with China expected to account for 50 of new global solar photovoltaic projects by 2024 47 48 nbsp The growth of solar PV on a semi log scale since 1996 nbsp Electricity production by sourceEarly days The early development of solar technologies starting in the 1860s was driven by an expectation that coal would soon become scarce such as experiments by Augustin Mouchot 49 Charles Fritts installed the world s first rooftop photovoltaic solar array using 1 efficient selenium cells on a New York City roof in 1884 50 However development of solar technologies stagnated in the early 20th century in the face of the increasing availability economy and utility of coal and petroleum 51 Bell Telephone Laboratories 1950s research used silicon wafers with a very thin coating of boron The Bell Solar Battery was described as 6 efficient with a square yard of the panels generating 50 watts 52 The first satellite with solar panels was launched in 1957 53 By the 1970s solar power was being used on satellites but the cost of solar power was considered to be unrealistic for conventional applications 54 In 1974 it was estimated that only six private homes in all of North America were entirely heated or cooled by functional solar power systems 55 However the 1973 oil embargo and 1979 energy crisis caused a reorganization of energy policies around the world and brought renewed attention to developing solar technologies 56 57 Deployment strategies focused on incentive programs such as the Federal Photovoltaic Utilization Program in the US and the Sunshine Program in Japan Other efforts included the formation of research facilities in the United States SERI now NREL Japan NEDO and Germany Fraunhofer ISE 58 Between 1970 and 1983 installations of photovoltaic systems grew rapidly In the United States President Jimmy Carter set a target of producing 20 of U S energy from solar by the year 2000 but his successor Ronald Reagan removed the funding for research into renewables 54 Falling oil prices in the early 1980s moderated the growth of photovoltaics from 1984 to 1996 Mid 1990s to 2010 In the mid 1990s development of both residential and commercial rooftop solar as well as utility scale photovoltaic power stations began to accelerate again due to supply issues with oil and natural gas global warming concerns and the improving economic position of PV relative to other energy technologies 54 59 In the early 2000s the adoption of feed in tariffs a policy mechanism that gives renewables priority on the grid and defines a fixed price for the generated electricity led to a high level of investment security and to a soaring number of PV deployments in Europe 2010s For several years worldwide growth of solar PV was driven by European deployment but it has since shifted to Asia especially China and Japan and to a growing number of countries and regions all over the world The largest manufacturers of solar equipment were based in China 60 61 Although concentrated solar power capacity grew more than tenfold it remained a tiny proportion of the total 62 51 because the cost of utility scale solar PV fell by 85 between 2010 and 2020 while CSP costs have only fallen 68 in the same timeframe 63 2020s Despite the rising cost of materials such as polysilicon during the 2021 2022 global energy crisis 64 utility scale solar was still the cheapest energy source in many countries due to the rising costs of other energy sources such as natural gas 65 In 2022 global solar generation capacity exceeded 1 TW for the first time 66 However fossil fuel subsidies have slowed the growth of solar generation capacity 67 Current status About half of installed capacity is utility scale 68 Forecasts nbsp Actual annual deployments of solar PV vs predictions by the IEA for the period 2002 2016 Predictions have largely and consistently underestimated actual growth Most new renewable capacity between 2022 and 2027 is forecast to be solar surpassing coal as the largest source of installed power capacity 69 26 Utility scale is forecast to become the largest source of electricity in all regions except sub Saharan Africa by 2050 68 According to a 2021 study global electricity generation potential of rooftop solar panels is estimated at 27 PWh per year at costs ranging from 40 Asia to 240 per MWh US Europe Its practical realization will however depend on the availability and cost of scalable electricity storage solutions 70 Photovoltaic power stations See also List of photovoltaic power stations This section is an excerpt from Photovoltaic power station edit nbsp The 40 5 MW Jannersdorf Solar Park in Prignitz GermanyA photovoltaic power station also known as a solar park solar farm or solar power plant is a large scale grid connected photovoltaic power system PV system designed for the supply of merchant power They are different from most building mounted and other decentralized solar power because they supply power at the utility level rather than to a local user or users Utility scale solar is sometimes used to describe this type of project This approach differs from concentrated solar power the other major large scale solar generation technology which uses heat to drive a variety of conventional generator systems Both approaches have their own advantages and disadvantages but to date for a variety of reasons photovoltaic technology has seen much wider use As of 2019 update about 97 of utility scale solar power capacity was PV 71 72 In some countries the nameplate capacity of photovoltaic power stations is rated in megawatt peak MWp which refers to the solar array s theoretical maximum DC power output In other countries the manufacturer states the surface and the efficiency However Canada Japan Spain and the United States often specify using the converted lower nominal power output in MWAC a measure more directly comparable to other forms of power generation Most solar parks are developed at a scale of at least 1 MWp As of 2018 the world s largest operating photovoltaic power stations surpassed 1 gigawatt At the end of 2019 about 9 000 solar farms were larger than 4 MWAC utility scale with a combined capacity of over 220 GWAC 71 Most of the existing large scale photovoltaic power stations are owned and operated by independent power producers but the involvement of community and utility owned projects is increasing 73 Previously almost all were supported at least in part by regulatory incentives such as feed in tariffs or tax credits but as levelized costs fell significantly in the 2010s and grid parity has been reached in most markets external incentives are usually not needed Concentrating solar power stations Main article List of solar thermal power stations nbsp Ivanpah Solar Electric Generating System with all three towers under load during February 2014 with the Clark Mountain Range seen in the distance nbsp Part of the 354 MW Solar Energy Generating Systems SEGS parabolic trough solar complex in northern San Bernardino County CaliforniaCommercial concentrating solar power CSP plants also called solar thermal power stations were first developed in the 1980s The 377 MW Ivanpah Solar Power Facility located in California s Mojave Desert is the world s largest solar thermal power plant project Other large CSP plants include the Solnova Solar Power Station 150 MW the Andasol solar power station 150 MW and Extresol Solar Power Station 150 MW all in Spain The principal advantage of CSP is the ability to efficiently add thermal storage allowing the dispatching of electricity over up to a 24 hour period Since peak electricity demand typically occurs at about 5 pm many CSP power plants use 3 to 5 hours of thermal storage 74 EconomicsSee also Photovoltaic power station Economics and finance Cost per watt The typical cost factors for solar power include the costs of the modules the frame to hold them wiring inverters labour cost any land that might be required the grid connection maintenance and the solar insolation that location will receive Photovoltaic systems use no fuel and modules typically last 25 to 40 years 75 Thus upfront capital and financing costs make up 80 to 90 of the cost of solar power 69 165 Some countries are considering price caps 76 whereas others prefer contracts for difference 77 The large magnitude of solar energy available makes it a highly appealing source of electricity In 2020 solar energy was the cheapest source of electricity 78 79 In Saudi Arabia a power purchase agreement PPA was signed in April 2021 for a new solar power plant in Al Faisaliah The project has recorded the world s lowest cost for solar PV electricity production of USD 1 04 cents kWh 80 Installation prices Expenses of high power band solar modules has greatly decreased over time Beginning in 1982 the cost per kW was approximately 27 000 American dollars and in 2006 the cost dropped to approximately 4 000 American dollars per kW The PV system in 1992 cost approximately 16 000 American dollars per kW and it dropped to approximately 6 000 American dollars per kW in 2008 81 In 2021 in the US residential solar cost from 2 to 4 dollars watt but solar shingles cost much more 82 and utility solar costs were around 1 watt 83 Productivity by location See also Solar irradiance The productivity of solar power in a region depends on solar irradiance which varies through the day and year and is influenced by latitude and climate PV system output power also depends on ambient temperature wind speed solar spectrum the local soiling conditions and other factors Onshore wind power tends to be the cheapest source of electricity in Northern Eurasia Canada some parts of the United States and Patagonia in Argentina whereas in other parts of the world mostly solar power or less often a combination of wind solar and other low carbon energy is thought to be best 84 8 Modelling by Exeter University suggests that by 2030 solar will be cheapest in all countries except for some in north east Europe 85 The locations with highest annual solar irradiance lie in the arid tropics and subtropics Deserts lying in low latitudes usually have few clouds and can receive sunshine for more than ten hours a day 86 87 These hot deserts form the Global Sun Belt circling the world This belt consists of extensive swathes of land in Northern Africa Southern Africa Southwest Asia Middle East and Australia as well as the much smaller deserts of North and South America 88 So solar is or is predicted to become the cheapest source of energy in all of Central America Africa the Middle East India South east Asia Australia and several other places 84 8 Different measurements of solar irradiance direct normal irradiance global horizontal irradiance are mapped below nbsp North America nbsp South America nbsp Europe nbsp Africa and Middle East nbsp South and South East Asia nbsp Australia nbsp WorldSelf consumption In cases of self consumption of solar energy the payback time is calculated based on how much electricity is not purchased from the grid 89 However in many cases the patterns of generation and consumption do not coincide and some or all of the energy is fed back into the grid The electricity is sold and at other times when energy is taken from the grid electricity is bought The relative costs and prices obtained affect the economics In many markets the price paid for sold PV electricity is significantly lower than the price of bought electricity which incentivizes self consumption 90 Moreover separate self consumption incentives have been used in e g Germany and Italy 90 Grid interaction regulation has also included limitations of grid feed in in some regions in Germany with high amounts of installed PV capacity 90 91 By increasing self consumption the grid feed in can be limited without curtailment which wastes electricity 92 A good match between generation and consumption is key for high self consumption The match can be improved with batteries or controllable electricity consumption 92 However batteries are expensive and profitability may require the provision of other services from them besides self consumption increase 93 for example avoiding power outages 94 Hot water storage tanks with electric heating with heat pumps or resistance heaters can provide low cost storage for self consumption of solar power 92 Shiftable loads such as dishwashers tumble dryers and washing machines can provide controllable consumption with only a limited effect on the users but their effect on self consumption of solar power may be limited 92 Energy pricing incentives and taxes Main article PV financial incentives The original political purpose of incentive policies for PV was to facilitate an initial small scale deployment to begin to grow the industry even where the cost of PV was significantly above grid parity to allow the industry to achieve the economies of scale necessary to reach grid parity Since reaching grid parity some policies are implemented to promote national energy independence 95 high tech job creation 96 and reduction of CO2 emissions 95 Financial incentives for photovoltaics differ across countries including Australia 97 China 98 Germany 99 India 100 Japan and the United States and even across states within the US Net metering nbsp Net metering unlike a feed in tariff requires only one meter but it must be bi directional In net metering the price of the electricity produced is the same as the price supplied to the consumer and the consumer is billed on the difference between production and consumption Net metering can usually be done with no changes to standard electricity meters which accurately measure power in both directions and automatically report the difference and because it allows homeowners and businesses to generate electricity at a different time from consumption effectively using the grid as a giant storage battery With net metering deficits are billed each month while surpluses are rolled over to the following month Best practices call for perpetual roll over of kWh credits 101 Excess credits upon termination of service are either lost or paid for at a rate ranging from wholesale to retail rate or above as can be excess annual credits 102 Community solar nbsp Community solar farm in the town of Wheatland Wisconsin 103 A community solar project is a solar power installation that accepts capital from and provides output credit and tax benefits to multiple customers including individuals businesses nonprofits and other investors Participants typically invest in or subscribe to a certain kW capacity or kWh generation of remote electrical production 68 Taxes In some countries tariffs import taxes are imposed on imported solar panels 104 105 Grid integrationMain articles Energy storage and Grid energy storage nbsp Construction of the Salt Tanks which provide efficient thermal energy storage 106 so that output can be provided after sunset and output can be scheduled to meet demand requirements 107 The 280 MW Solana Generating Station is designed to provide six hours of energy storage This allows the plant to generate about 38 of its rated capacity over the course of a year 108 nbsp Thermal energy storage The Andasol CSP plant uses tanks of molten salt to store solar energy nbsp Pumped storage hydroelectricity PSH This facility in Geesthacht Germany also includes a solar array Variability The overwhelming majority of electricity produced worldwide is used immediately because traditional generators can adapt to demand and storage is usually more expensive Both solar power and wind power are sources of variable renewable power meaning that all available output must be used locally carried on transmission lines to be used elsewhere or stored e g in a battery Since solar energy is not available at night storing it so as to have continuous electricity availability is potentially an important issue particularly in off grid applications and for future 100 renewable energy scenarios 109 Solar electricity is inherently variable but somewhat predictable by time of day location and seasons see solar power forecasting Solar is intermittent due to the day night cycles and variable weather conditions The challenge of integrating solar power in any given electric utility varies significantly In places with hot summers and mild winters solar is well matched to daytime cooling demands 110 Energy storage Concentrated solar power plants may use thermal storage to store solar energy such as in high temperature molten salts These salts are an effective storage medium because they are low cost have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems This method of energy storage is used for example by the Solar Two power station allowing it to store 1 44 TJ in its 68 m3 storage tank enough to provide full output for close to 39 hours with an efficiency of about 99 111 In stand alone PV systems batteries are traditionally used to store excess electricity With grid connected photovoltaic power systems excess electricity can be sent to the electrical grid Net metering and feed in tariff programs give these systems a credit for the electricity they produce This credit offsets electricity provided from the grid when the system cannot meet demand effectively trading with the grid instead of storing excess electricity 112 When wind and solar are a small fraction of the grid power other generation techniques can adjust their output appropriately but as these forms of variable power grow additional balance on the grid is needed As prices are rapidly declining PV systems increasingly use rechargeable batteries to store a surplus to be used later at night Batteries used for grid storage can stabilize the electrical grid by leveling out peak loads for a few hours In the future less expensive batteries could play an important role on the electrical grid as they can charge during periods when generation exceeds demand and feed their stored energy into the grid when demand is higher than generation Common battery technologies used in today s home PV systems include nickel cadmium lead acid nickel metal hydride and lithium ion 113 114 better source needed Lithium ion batteries have the potential to replace lead acid batteries in the near future as they are being intensively developed and lower prices are expected due to economies of scale provided by large production facilities such as the Gigafactory 1 In addition the Li ion batteries of plug in electric cars may serve as future storage devices in a vehicle to grid system Since most vehicles are parked an average of 95 of the time their batteries could be used to let electricity flow from the car to the power lines and back Other rechargeable batteries used for distributed PV systems include sodium sulfur and vanadium redox batteries two prominent types of a molten salt and a flow battery respectively 115 116 117 nbsp Seasonal cycle of capacity factors for wind and photovoltaics in Europe under idealized assumptions The figure illustrates the balancing effects of wind and solar energy at the seasonal scale Kaspar et al 2019 118 Other technologies Solar power plants while they can be curtailed usually simply output as much power as possible Therefore in an electricity system without sufficient grid energy storage generation from other sources coal biomass natural gas nuclear hydroelectricity generally go up and down in reaction to the rise and fall of solar electricity and variations in demand see load following power plant Conventional hydroelectric dams work very well in conjunction with solar power water can be held back or released from a reservoir as required Where suitable geography is not available pumped storage hydroelectricity can use solar power to pump water to a high reservoir on sunny days then the energy is recovered at night and in bad weather by releasing water via a hydroelectric plant to a low reservoir where the cycle can begin again 119 While hydroelectric and natural gas plants can quickly respond to changes in load coal biomass and nuclear plants usually take considerable time to respond to load and can only be scheduled to follow the predictable variation Depending on local circumstances beyond about 20 40 of total generation grid connected intermittent sources like solar tend to require investment in some combination of grid interconnections energy storage or demand side management In countries with high solar generation such as Australia electricity prices may become negative in the middle of the day when solar generation is high thus incentivizing new battery storage 120 121 The combination of wind and solar PV has the advantage that the two sources complement each other because the peak operating times for each system occur at different times of the day and year 122 The power generation of such solar hybrid power systems is therefore more constant and fluctuates less than each of the two component subsystems 123 Solar power is seasonal particularly in northern southern climates away from the equator suggesting a need for long term seasonal storage in a medium such as hydrogen or pumped hydroelectric 124 Environmental effectsFurther information Concentrated solar power Environmental effects nbsp Greenhouse gas emissions per energy source Solar power is one of the sources with the least greenhouse gas emissions nbsp Part of the Senftenberg Solarpark a solar photovoltaic power plant located on former open pit mining areas close to the city of Senftenberg in Eastern Germany The 78 MW Phase 1 of the plant was completed within three months Solar power is cleaner than electricity from fossil fuels 19 so can be good for the environment when it replaces that 125 Solar power does not lead to any harmful emissions during operation but the production of the panels leads to some amount of pollution A 2021 study estimated the carbon footprint of manufacturing monocrystalline panels at 515 g CO2 kWp in the US and 740 g CO2 kWp in China 126 but this is expected to fall as manufacturers use more clean electricity and recycled materials 127 Solar power carries an upfront cost to the environment via production with a carbon payback time of several years as of 2022 update 127 but offers clean energy for the remainder of their 30 year lifetime 128 The life cycle greenhouse gas emissions of solar farms are less than 50 gram g per kilowatt hour kWh 129 130 131 but with battery storage could be up to 150 g kWh 132 In contrast a combined cycle gas fired power plant without carbon capture and storage emits around 500 g kWh and a coal fired power plant about 1000 g kWh 133 Similar to all energy sources where their total life cycle emissions are mostly from construction the switch to low carbon power in the manufacturing and transportation of solar devices would further reduce carbon emissions 131 Lifecycle surface power density of solar power varies a lot 134 but averages about 7 W m2 compared to about 240 for nuclear power and 480 for gas 135 However when the land required for gas extraction and processing is accounted for gas power is estimated to have not much higher power density than solar 19 PV requires much larger amounts of land surface to produce the same nominal amount of energy as sources which with higher surface power density and capacity factor According to a 2021 study obtaining 25 to 80 of electricity from solar farms in their own territory by 2050 would require the panels to cover land ranging from 0 5 to 2 8 of the European Union 0 3 to 1 4 in India and 1 2 to 5 2 in Japan and South Korea 136 Occupation of such large areas for PV farms could drive residential opposition as well as lead to deforestation removal of vegetation and conversion of farm land 137 However some countries such as South Korea and Japan use land for agriculture under PV 138 139 or floating solar 140 together with other low carbon power sources 141 142 Worldwide land use has minimal ecological impact 143 Land use can be reduced to the level of gas power by installing on buildings and other built up areas 134 Harmful materials are used in the production of solar panels but in generally in small amounts 144 As of 2022 update the environmental impact of perovskite is hard to estimate but there is some concern that lead may become a problem 19 A 2021 International Energy Agency study projects the demand for copper will double by 2040 The study cautions that supply needs to increase rapidly to match demand from large scale deployment of solar and required grid upgrades 145 146 More tellurium and indium may also be needed and recycling may help 19 As solar panels are sometimes replaced with more efficient panels the second hand panels are sometimes reused in developing countries for example in Africa 147 Several countries have specific regulations for the recycling of solar panels 148 149 150 Although maintenance cost is already low compared to other energy sources 151 some academics have called for solar power systems to be designed to be more repairable 152 153 A very small proportion of solar power is concentrated solar power Concentrated solar power may use much more water than gas fired power This can be a problem as this type of solar power needs strong sunlight so is often built in deserts 154 Politics nbsp Acceptance of wind and solar facilities in one s community is stronger among U S Democrats blue while 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