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Solar power

January 09, 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 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 have grown more or less exponentially. Millions of installations and gigawatt-scale photovoltaic power stations continue to be built, with half of new generation capacity being solar in 2021.[3]

As of 2021, solar generates 4% of the world's electricity, compared to 1% in 2015 when the Paris Agreement to limit climate change was signed.[4] Along with onshore wind, the cheapest levelised cost of electricity is utility-scale solar.[5]

Much more low carbon power, such as solar, is urgently needed to limit climate change, but the International Energy Agency said in 2022 that more effort was needed for grid integration and the mitigation of policy, regulation and financing challenges.[6]

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[7]

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.[8] The German industrialist Ernst Werner von Siemens was among those who recognized the importance of this discovery.[9] In 1931, the German engineer Bruno Lange developed a photo cell using silver selenide in place of copper oxide,[10] 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.[11] These early solar cells cost US$286/watt and reached efficiencies of 4.5–6%.[12] In 1957, Mohamed M. Atalla developed the process of silicon surface passivation by thermal oxidation at Bell Labs.[13][14] The surface passivation process has since been critical to solar cell efficiency.[15]

As of 2022 over 90% of the market is crystalline silicon.[16] 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.[7] 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.[7]

Many residential PV systems are connected to the grid wherever available, especially in developed countries with large markets.[17] 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.

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.[18]

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.[19] Thermal storage efficiently allows overnight electricity generation,[20] thus complementing PV.[21] CSP generates a very small share of solar power and in 2022 the IEA said that CSP should be better paid for its storage.[22]

As of 2021 the LCOE of CSP is over twice that of PV,[23] however their very high temperatures may prove useful to help decarbonize industries (perhaps via hydrogen) which need to be hotter than electricity can provide.[24]

Hybrid systems

Main article: Hybrid power

A hybrid system combines solar with energy storage and/or one or more other forms of generation. Hydro,[25][26] wind[27][28] and batteries[29] 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.[30][31] 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,[32] and existing power lines can sometimes be used.[33][34]

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 evolution of solar power production by region
 
The share of electricity production from solar, 2021[35]
Deployment of Solar Power
Capacity in GW by Technology
100
200
300
400
500
600
700
2007
2010
2013
2016
2019
Worldwide deployment of solar power by technology since 2006[36]

     Solar PV         CSP - Solar thermal

 
The growth of solar PV on a semi-log scale since 1992
 
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.[37] Charles Fritts installed the world's first rooftop photovoltaic solar array, using 1%-efficient selenium cells, on a New York City roof in 1884.[38] 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.[39] The first satellite with solar panels was launched in 1957.[40]

By the 1970s, solar power was being used on satellites, but the cost of solar power was considered to be unrealistic for conventional applications.[41] 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.[42] 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.[43][44]

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).[45] 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.[41] 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.[41][46] 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 then shifted to Asia, especially China and Japan, and to a growing number of countries and regions all over the world. The largest manufacturers were located in China.[47][48] Although concentrated solar power grew more than tenfold it remained a tiny proportion of the total,[49]: 51  because the cost of utility-scale solar PV fell by 85%, to below CSP cost which fell only 68%.[50]

2020s

Despite the rising cost of materials, such as polysilicon, during the 2021–2022 global energy crisis;[51] the cost of some other energy sources, such as natural gas, rose more thus making utility scale solar the cheapest energy source in many countries.[52] 1 TW had been installed by 2022.[53] However growth continued to be hindered by fossil-fuel subsidies.[54]

Current status

About half of installed capacity is utility scale.[55] According to the IEA not enough CSP is being built.[56]

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.[57]: 26  Utility scale is forecast to become the largest capacity in all regions except sub-Saharan Africa.[55]

According to a 2021 study global electricity generation potential of rooftop solar panels is estimated at 27 PWh per year at cost 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.[58]

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 decentralised solar power because they supply power at the utility level, rather than to a local user or users. The generic expression utility-scale solar is sometimes used to describe this type of project.

The solar power source is solar panels that convert light directly to electricity. However, this differs from and should not be confused with 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.[59][60]

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.[59]

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.[61] 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.[62]

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.[63] Thus upfront capital and financing costs make up 80 to 90% of the cost of solar power.[57]: 165 

Some countries are considering price caps,[64] whereas others prefer contracts for difference.[65]

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.[66][67] 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.[68]

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.[69]

In 2021 in the US, residential solar cost from 2 to 4 dollars/watt (but solar shingles cost much more)[70] and utility solar costs were around $1/watt.[71]

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.[72]: 8 

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.[73][74] 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.[75]

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.[72]: 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.[76] 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.[77] Moreover, separate self consumption incentives have been used in e.g. Germany and Italy.[77] Grid interaction regulation has also included limitations of grid feed-in in some regions in Germany with high amounts of installed PV capacity.[77][78] By increasing self consumption, the grid feed-in can be limited without curtailment, which wastes electricity.[79]

A good match between generation and consumption is key for high self-consumption. The match can be improved with batteries or controllable electricity consumption.[79] However, batteries are expensive and profitability may require the provision of other services from them besides self consumption increase.[80] Hot water storage tanks with electric heating with heat pumps or resistance heaters can provide low-cost storage for self consumption of solar power.[79] 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.[79]

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,[81] high tech job creation[82] and reduction of CO2 emissions.[81]

Three incentive mechanisms are often used in combination as investment subsidies: the authorities refund part of the cost of installation of the system, the electricity utility buys PV electricity from the producer under a multiyear contract at a guaranteed rate, and Solar Renewable Energy Certificates (SRECs).[citation needed]

Financial incentives for photovoltaics differ across countries, including Australia,[83] China,[84] Germany,[85] India,[86] 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.[87] 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.[88]

Taxes

In some countries tariffs (import taxes) are imposed on imported solar panels.[89][90]

Grid integration

Main articles: Energy storage and Grid energy storage
 
Construction of the Salt Tanks which provide efficient thermal energy storage[91] so that output can be provided after sunset, and output can be scheduled to meet demand requirements.[92] 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.[93]
 
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.

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 elsewhere to be used, or stored (e.g. in a battery). Since solar energy is not available at night, storing its energy is potentially an important issue particularly in off-grid and for future 100% renewable energy scenarios to have continuous electricity availability.[94]

Solar electricity is inherently variable but somewhat predictable by time of day, location, and seasons. Solar is intermittent due to day/night cycles and unpredictable weather. How much of a special challenge solar power is in any given electric utility varies significantly. In places with hot summers and mild winters, solar is well matched to daytime cooling demands.[95]

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.[96]

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%.[97]

In stand alone PV systems batteries are traditionally used to store excess electricity. With grid-connected photovoltaic power system, 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.[98] 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 later used 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.[99][100][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.[101][102][103]

 
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).[104]

Other technologies

In an electricity system without grid energy storage, generation from stored fuels (coal, biomass, natural gas, nuclear) must go up and down in reaction to the rise and fall of solar electricity (see load following power plant). 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.[105][106]

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.[107] The power generation of such solar hybrid power systems is therefore more constant and fluctuates less than each of the two component subsystems.[108] 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.[109]

Environmental effects

Further information: Concentrated_solar_power § Environmental_effects

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.[110]

 
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:[16] 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,[111] but this is expected to fall as manufacturers use more clean electricity and recycled materials.[112] Solar power carries an upfront cost to the environment via production with a carbon payback time of a few years as of 2022,[112] but offers clean energy for the rest of its 30 year lifetime.[113]

The life-cycle greenhouse-gas emissions of solar farms are less than 50 gram (g) per kilowatt-hour (kWh),[114][115][116] but with battery storage could be up to 150 g/kWh.[117] 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.[118] 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.[116]

Life-cycle surface power density of solar power varies a lot[119] but averages about 7 W/m2, compared to about 240 for nuclear power and 480 for gas.[120] 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.[16] PV requires much larger amounts of land surface to produce the same nominal amount of energy as sources 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.[121] 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.[122] However some countries, such as South Korea and Japan, use land for agriculture under PV,[123][124] or floating solar.[125] Worldwide land use has minimal ecological impact.[126] Land use can be reduced to the level of gas power by installing on buildings and other built up areas.[119]

Harmful materials are used in the production of solar panels, but in generally in small amounts.[127] As of 2022 the environmental impact of perovskite is hard to estimate, but there is some concern that lead may become a problem.[16] 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.[128][129] More tellurium and indium may also be needed and recycling may help.[16]

As solar panels are sometimes replaced with more efficient panels, the second-hand panels are sometimes reused in developing countries, for example in Africa.[130] Several countries have specific regulations for the recycling of solar panels.[131][132][133] Although maintenance cost is already low compared to other energy sources,[134] some academics have called for solar power systems to be designed to be more repairable.[135][136]

Political issues

As of 2022 over 40% of global polysilicon manufacturing capacity is in Xinjiang in China,[137] which raises concerns about human rights violations (Xinjang internment camps) as well as supply chain dependency.[138] However solar cannot be cut off, unlike oil and gas, so can contribute to energy security.[139]

See also

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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.

January 09, 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, conversion, energy, from, sunligh. 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 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 have grown more or less exponentially Millions of installations and gigawatt scale photovoltaic power stations continue to be built with half of new generation capacity being solar in 2021 3 As of 2021 solar generates 4 of the world s electricity compared to 1 in 2015 when the Paris Agreement to limit climate change was signed 4 Along with onshore wind the cheapest levelised cost of electricity is utility scale solar 5 Much more low carbon power such as solar is urgently needed to limit climate change but the International Energy Agency said in 2022 that more effort was needed for grid integration and the mitigation of policy regulation and financing challenges 6 Contents 1 Technologies 1 1 Photovoltaic cells 1 2 Concentrated solar power 1 3 Hybrid systems 2 Development and deployment 2 1 Early days 2 2 Mid 1990s to 2010 2 3 2010s 2 4 2020s 2 5 Current status 2 6 Forecasts 2 7 Photovoltaic power stations 2 8 Concentrating solar power stations 3 Economics 3 1 Cost per watt 3 2 Installation prices 3 3 Productivity by location 3 4 Self consumption 3 5 Energy pricing incentives and taxes 3 5 1 Net metering 3 5 2 Taxes 4 Grid integration 4 1 Energy storage 4 2 Other technologies 5 Environmental effects 6 Political issues 7 See also 8 References 9 Further reading 10 External linksTechnologiesSolar 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 Schematics of a grid connected residential PV power system 7 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 8 The German industrialist Ernst Werner von Siemens was among those who recognized the importance of this discovery 9 In 1931 the German engineer Bruno Lange developed a photo cell using silver selenide in place of copper oxide 10 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 11 These early solar cells cost US 286 watt and reached efficiencies of 4 5 6 12 In 1957 Mohamed M Atalla developed the process of silicon surface passivation by thermal oxidation at Bell Labs 13 14 The surface passivation process has since been critical to solar cell efficiency 15 As of 2022 update over 90 of the market is crystalline silicon 16 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 7 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 7 Many residential PV systems are connected to the grid wherever available especially in developed countries with large markets 17 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 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 18 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 19 Thermal storage efficiently allows overnight electricity generation 20 thus complementing PV 21 CSP generates a very small share of solar power and in 2022 the IEA said that CSP should be better paid for its storage 22 As of 2021 update the LCOE of CSP is over twice that of PV 23 however their very high temperatures may prove useful to help decarbonize industries perhaps via hydrogen which need to be hotter than electricity can provide 24 Hybrid systems Main article Hybrid power A hybrid system combines solar with energy storage and or one or more other forms of generation Hydro 25 26 wind 27 28 and batteries 29 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 30 31 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 32 and existing power lines can sometimes be used 33 34 Development and deploymentSee also Growth of photovoltaics Timeline of solar cells Solar power by country and Concentrated solar power Deployment around the world The evolution of solar power production by region The share of electricity production from solar 2021 35 Deployment of Solar Power Capacity in GW by Technology 100 200 300 400 500 600 700 2007 2010 2013 2016 2019Worldwide deployment of solar power by technology since 2006 36 Solar PV CSP Solar thermal The growth of solar PV on a semi log scale since 1992 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 37 Charles Fritts installed the world s first rooftop photovoltaic solar array using 1 efficient selenium cells on a New York City roof in 1884 38 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 39 The first satellite with solar panels was launched in 1957 40 By the 1970s solar power was being used on satellites but the cost of solar power was considered to be unrealistic for conventional applications 41 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 42 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 43 44 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 45 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 41 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 41 46 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 then shifted to Asia especially China and Japan and to a growing number of countries and regions all over the world The largest manufacturers were located in China 47 48 Although concentrated solar power grew more than tenfold it remained a tiny proportion of the total 49 51 because the cost of utility scale solar PV fell by 85 to below CSP cost which fell only 68 50 2020s Despite the rising cost of materials such as polysilicon during the 2021 2022 global energy crisis 51 the cost of some other energy sources such as natural gas rose more thus making utility scale solar the cheapest energy source in many countries 52 1 TW had been installed by 2022 53 However growth continued to be hindered by fossil fuel subsidies 54 Current status About half of installed capacity is utility scale 55 According to the IEA not enough CSP is being built 56 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 57 26 Utility scale is forecast to become the largest capacity in all regions except sub Saharan Africa 55 According to a 2021 study global electricity generation potential of rooftop solar panels is estimated at 27 PWh per year at cost 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 58 Photovoltaic power stations See also List of photovoltaic power stations This section is an excerpt from Photovoltaic power station edit The 40 5 MW Jannersdorf 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 decentralised solar power because they supply power at the utility level rather than to a local user or users The generic expression utility scale solar is sometimes used to describe this type of project The solar power source is solar panels that convert light directly to electricity However this differs from and should not be confused with 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 59 60 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 59 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 61 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 62 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 63 Thus upfront capital and financing costs make up 80 to 90 of the cost of solar power 57 165 Some countries are considering price caps 64 whereas others prefer contracts for difference 65 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 66 67 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 68 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 69 In 2021 in the US residential solar cost from 2 to 4 dollars watt but solar shingles cost much more 70 and utility solar costs were around 1 watt 71 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 72 8 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 73 74 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 75 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 72 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 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 76 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 77 Moreover separate self consumption incentives have been used in e g Germany and Italy 77 Grid interaction regulation has also included limitations of grid feed in in some regions in Germany with high amounts of installed PV capacity 77 78 By increasing self consumption the grid feed in can be limited without curtailment which wastes electricity 79 A good match between generation and consumption is key for high self consumption The match can be improved with batteries or controllable electricity consumption 79 However batteries are expensive and profitability may require the provision of other services from them besides self consumption increase 80 Hot water storage tanks with electric heating with heat pumps or resistance heaters can provide low cost storage for self consumption of solar power 79 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 79 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 81 high tech job creation 82 and reduction of CO2 emissions 81 Three incentive mechanisms are often used in combination as investment subsidies the authorities refund part of the cost of installation of the system the electricity utility buys PV electricity from the producer under a multiyear contract at a guaranteed rate and Solar Renewable Energy Certificates SRECs citation needed Financial incentives for photovoltaics differ across countries including Australia 83 China 84 Germany 85 India 86 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 87 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 88 Taxes In some countries tariffs import taxes are imposed on imported solar panels 89 90 Grid integrationMain articles Energy storage and Grid energy storage Construction of the Salt Tanks which provide efficient thermal energy storage 91 so that output can be provided after sunset and output can be scheduled to meet demand requirements 92 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 93 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 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 elsewhere to be used or stored e g in a battery Since solar energy is not available at night storing its energy is potentially an important issue particularly in off grid and for future 100 renewable energy scenarios to have continuous electricity availability 94 Solar electricity is inherently variable but somewhat predictable by time of day location and seasons Solar is intermittent due to day night cycles and unpredictable weather How much of a special challenge solar power is in any given electric utility varies significantly In places with hot summers and mild winters solar is well matched to daytime cooling demands 95 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 96 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 97 In stand alone PV systems batteries are traditionally used to store excess electricity With grid connected photovoltaic power system 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 98 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 later used 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 99 100 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 101 102 103 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 104 Other technologies In an electricity system without grid energy storage generation from stored fuels coal biomass natural gas nuclear must go up and down in reaction to the rise and fall of solar electricity see load following power plant 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 105 106 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 107 The power generation of such solar hybrid power systems is therefore more constant and fluctuates less than each of the two component subsystems 108 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 109 Environmental effectsFurther information Concentrated solar power Environmental effects 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 110 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 16 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 111 but this is expected to fall as manufacturers use more clean electricity and recycled materials 112 Solar power carries an upfront cost to the environment via production with a carbon payback time of a few years as of 2022 update 112 but offers clean energy for the rest of its 30 year lifetime 113 The life cycle greenhouse gas emissions of solar farms are less than 50 gram g per kilowatt hour kWh 114 115 116 but with battery storage could be up to 150 g kWh 117 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 118 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 116 Life cycle surface power density of solar power varies a lot 119 but averages about 7 W m2 compared to about 240 for nuclear power and 480 for gas 120 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 16 PV requires much larger amounts of land surface to produce the same nominal amount of energy as sources 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 121 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 122 However some countries such as South Korea and Japan use land for agriculture under PV 123 124 or floating solar 125 Worldwide land use has minimal ecological impact 126 Land use can be reduced to the level of gas power by installing on buildings and other built up areas 119 Harmful materials are used in the production of solar panels but in generally in small amounts 127 As of 2022 update the environmental impact of perovskite is hard to estimate but there is some concern that lead may become a problem 16 A 2021 International 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solar energy systems A review Science of the Total Environment 754 141989 Bibcode 2021ScTEn 754n1989R doi 10 1016 j scitotenv 2020 141989 ISSN 0048 9697 PMID 32920388 S2CID 221671774 Renewable revolution will drive demand for critical minerals RenewEconomy 5 May 2021 Retrieved 5 May 2021 Clean energy demand for critical minerals set to soar as the world pursues net zero goals News IEA Retrieved 5 May 2021 Used Solar Panels Are Powering the Developing World Bloomberg com 25 August 2021 Retrieved 15 September 2022 US EPA OLEM 23 August 2021 End of Life Solar Panels Regulations and Management www epa gov Retrieved 15 September 2022 The Proposed Legal Framework On Responsibility Of Producers And www roedl com Retrieved 15 September 2022 Majewski Peter Al shammari Weam Dudley Michael Jit Joytishna Lee Sang Heon Myoung Kug Kim Sung Jim Kim 1 February 2021 Recycling of solar PV panels product stewardship and regulatory approaches Energy Policy 149 112062 doi 10 1016 j enpol 2020 112062 ISSN 0301 4215 S2CID 230529644 Gurturk Mert 15 March 2019 Economic feasibility of solar power plants based on PV module with levelized cost analysis Energy 171 866 878 doi 10 1016 j energy 2019 01 090 ISSN 0360 5442 S2CID 116733543 Cross Jamie Murray Declan 1 October 2018 The afterlives of solar power Waste and repair off the grid in Kenya Energy Research amp Social Science 44 100 109 doi 10 1016 j erss 2018 04 034 ISSN 2214 6296 S2CID 53058260 Jang Esther Barela Mary Claire Johnson Matt Martinez Philip Festin Cedric Lynn Margaret Dionisio Josephine Heimerl Kurtis 19 April 2018 Crowdsourcing Rural Network Maintenance and Repair via Network Messaging Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems CHI 18 New York NY USA Association for Computing Machinery 1 12 doi 10 1145 3173574 3173641 ISBN 978 1 4503 5620 6 S2CID 4950067 Blunt Phred Dvorak and Katherine 9 August 2022 WSJ News Exclusive U S Solar Shipments Are Hit by Import Ban on China s Xinjiang Region The Wall Street Journal ISSN 0099 9660 Retrieved 8 September 2022 Fears over China s Muslim forced labor loom over EU solar power POLITICO 10 February 2021 Retrieved 15 April 2021 Making solar a source of EU energy security Think Tank European Parliament www europarl europa eu Retrieved 3 November 2022 Further readingSivaram 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 linksSolar energy and the environment at U S Energy Information Administration Wikimedia Commons has media related to Solar power Portals Energy Environment Renewable energy Retrieved from https en wikipedia org w index php title Solar power amp oldid 1132184996, wikipedia, wiki, book, books, library,

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