Solar power in the United States
Solar power in the United States includes utility-scale solar power plants as well as local distributed generation, mostly from rooftop photovoltaics.
As of the end of 2017, the United States had over 50 gigawatts of installed photovoltaic capacity. In 2018, utility scale solar power generated 66.6 terawatt-hours, 1.66% of total U.S. electricity. During the same time period total solar generation, including estimated small scale photovoltaic generation, was 96.1 TWh, 2.30% of total U.S. electricity. In terms of total cumulative installed capacity, by year end 2017 the United States ranked 2nd in the world behind China.
In 2016, 39% of all new electricity generation capacity in the country came from solar, more than any other source and ahead of natural gas. By 2015, solar employment had overtaken oil and gas as well as coal employment in the United States. In 2016, more than 260,000 Americans were employed in the solar industry.
The United States conducted much early research in photovoltaics and concentrated solar power.
It is among the top countries in the world in electricity generated by the Sun and several of the world's largest utility-scale installations are located in the desert Southwest. The oldest solar power plant in the world is the 354-megawatt SEGS thermal power plant, in California. The Ivanpah Solar Electric Generating System is a solar thermal power project in the California Mojave Desert, 40 miles southwest of Las Vegas, with a gross capacity of 392 MW. The 280 MW Solana Generating Station is a solar power plant near Gila Bend, Arizona, about southwest of Phoenix, completed in 2013. When commissioned it was the largest parabolic trough plant in the world and the first U.S. solar plant with molten salt thermal energy storage.
There are plans to build many other large solar plants in the United States. Many states have set individual renewable energy goals with solar power being included in various proportions. Hawaii plans 100% renewable-sourced electricity by 2045. Governor Jerry Brown has signed legislation requiring California's utilities to obtain 100 percent of their electricity from zero-carbon sources by the end of 2045.
The panels must be paired with batteries to function during power loss on the grid. This is a new area for panel manufacturers. Sunrun, the largest panel manufacturer, provides some units with batteries, but they are numbered in the hundreds.
Solar potential
A 2012 report from the National Renewable Energy Laboratory described technically available renewable energy resources for each state and estimated that urban utility scale photovoltaics could supply 2,232 TWh/year, rural utility scale PV 280,613 TWh/year, rooftop PV 818 TWh/year, and CSP 116,146 TWh/year, for a total of almost 400,000 TWh/year, 100 times current consumption of 3,856 TWh in 2011.For comparison, onshore wind potential is estimated at 32,784 TWh/year, and offshore wind at 16,976 TWh/year, while the total available from all renewable resources is estimated at 481,963 TWh/year.
History
Solar energy deployment increased at a record pace in the United States and throughout the world in 2008, according to industry reports. The Solar Energy Industries Association's "2008 U.S. Solar Industry Year in Review" found that U.S. solar energy capacity increased by 17% in 2007, reaching the total equivalent of 8,775 megawatts. The SEIA report tallies all types of solar energy, and in 2007 the United States installed 342 MW of solar photovoltaic electric power, 139 thermal megawatts of solar water heating, 762 MWth of pool heating, and 21 MWth of solar space heating and cooling.Another report in 2008 by research and publishing firm Clean Edge and the nonprofit Co-op America found that solar power's contribution could grow to 10% of the nation's power needs by 2025, with nearly 2% of the nation's electricity coming from concentrating solar power systems, while solar photovoltaic systems would provide more than 8% of the nation's electricity.
Those figures correlate to nearly 50,000 megawatts of solar photovoltaic systems and more than 6,600 megawatts of concentrating solar power. The report noted that the cost per kilowatt-hour of solar photovoltaic systems had been dropping, while electricity generated from fossil fuels was becoming more expensive.
As a result, the report projects that solar power was expected to reach cost parity with conventional power sources in many U.S. markets by 2015.
To reach the 10% goal, solar photovoltaic companies would need to make solar power a "plug-and-play technology", or simplify the deployment of solar systems.
The report also underlines the importance of future "smart grid" technologies.
Solar Energy Industries Association and GTM Research found that the amount of new solar electric capacity increased in 2012 by 76 percent from 2011, raising the United States’ market share of the world’s installations above 10 percent, up from roughly 5 to 7 percent in the past seven years.
According to the U.S. Energy Information Administration, as of September 2014 utility-scale solar had sent 12,303 gigawatt-hours of electricity to the U.S. grid. This was an increase of over 100% versus the same period in 2013.
The number of homes with solar systems installed had been increasing rapidly; from 30,000 in 2006 to 1.3 million in 2016 with a study by the U.S. Department of Energy predicting the figure could reach 3.8 million homes by 2020.
In 2015 an article reported that Utilities in the United States have led a largely unsuccessful campaign to slow the growth of solar.
Solar photovoltaic power
Solar PV installed capacity
This forecast does not account for economic impacts of the COVID-19 pandemic.In the United States, 14,626 MW of PV was installed in 2016, a 95% increase over 2015.
During 2016, 22 states added at least 100 MW of capacity.
Just 4,751 MW of PV installations were completed in 2013. The U.S. had approximately 440 MW of off-grid photovoltaics as of the end of 2010. Through the end of 2005, a majority of photovoltaics in the United States was off-grid.
Solar PV generation
The amount of electricity a unit is capable of producing over an extended period of time is determined by multiplying the capacity by the capacity factor.The capacity factor for solar photovoltaic units is largely a function of climate and latitude and so varies significantly from state to state.
The National Renewable Energy Laboratory has calculated that the highest statewide average solar voltaic capacity factors are in Arizona, New Mexico, and Nevada, and the lowest is Alaska. The lowest statewide average capacity factor in the contiguous 48 states is in West Virginia.
Solar PV by type
The table above gives an indication of the spread of solar PV between the different types at the end of 2018. Capacity figures may seem smaller than those quoted by other sources and it is likely that the capacities are measured in MW AC rather than MW DC, the former of which gives a lower reading due to conversion losses during the process by which power is transformed by inverters from direct current to alternating current. Utility scale PV accounted for the largest figure at 30.17 GW and 63 TWh of generation. Next came small scale PV with 19.52 GW capacity and 29.54 TWh of generation. The proportion of residential and commercial solar to utility scale solar varies greatly between states. Finally solar thermal generation was the smallest deployment by power rating at 1.76 GW capacity and 3.59 TWh generation.Large-scale PV facilities
Current situation
Large-scale photovoltaic power plants in the United States often consist of two or more units which correspond to construction stages and/or technology-improvement phases of a particular development project. Typically these units are co-located in the vicinity of the same high-capacity transmission substation, and may also feed that substation with other large PV plants which are adjacently sited but separately developed. As of 2018, the ten largest operating plants in the United States, based on development grouping and total AC power capacity, are:1) The 579 megawatt Solar Star plant in California was the world's largest photovoltaic power station when completed in 2015. It was superseded later that year by the Longyangxia Dam Solar Park in China.
2) The Copper Mountain Solar Facility is a 552 MWAC solar power plant in Eldorado Valley, Nevada that consists of four units. Sempra Generation completed the first unit in 2010, and the latest came online in late 2016.
3) The Topaz Solar Farm is a 550 MWAC photovoltaic power plant near San Luis Obispo County, California that has been fully operational since November 2014.
4) The Desert Sunlight Solar Farm is a 550 MWAC solar power station located in the Sonoran Desert of California and completed in January 2015.
5) The 460 MWAC Mount Signal Solar reached its current capacity when unit III came online in late 2018; the project will reach 600 MW when unit II is completed around 2020.
6) The 400 MWAC Mesquite Solar project in Arizona consists of three units at the end of 2016 and is still being expanded.
7) The Agua Caliente Solar Project is a 290 MWAC facility in Yuma County, Arizona operating at full capacity since April 2014.
8) The California Flats Solar Project in Monterey County, California reached a capacity of 280 MWAC when a second unit came online at the end of 2018.
9) The Springbok Solar Farm is a 260 MWAC facility in Kern County, California with two units completed. It is expected to reach 350 MW with completion of the third unit in 2019.
10) At 250 MWAC each, there are five plants: McCoy Solar Energy Project, Silver State South Solar Project, California Valley Solar Ranch, Desert Stateline Solar Facility, and Moapa Southern Paiute Solar Project
Planned PV plants
is SolarCity's five-year plan to build more than $1 billion in solar photovoltaic projects for privatized military housing communities across the United States. SolarCity plans to work with the country's leading privatized military housing developers to install, own and operate rooftop solar installations and provide solar electricity at a lower cost than utility power. SolarStrong is ultimately expected to create up to 300 megawatts of solar generation capacity that could provide power to as many as 120,000 military housing units, making it the largest residential photovoltaic project in American history. In November 2011, SolarCity and Bank of America Merrill Lynch announced that they have agreed to terms on financing for SolarStrong.Distributed generation
Within the cumulative PV capacity in the United States, there has been growth in the distributed generation segment, which are all grid-connected PV installations in the residential and non-residential markets. Non-residential market includes installations on commercial, government, school and non-profit organization properties.Between 2000 and 2013 there had been 2,261 MW of residential solar and 4,051 MW non-residential solar installed.
An example of a large scale PV installations in schools was the solar project of San Diego Unified School District with total of 48 sites and aggregated installed capacity of 9.17 MW. One of the largest rooftop installations for commercial properties was the 9 MW system of Holt Logistics refrigerated warehouse at the Gloucester Marine Terminal in New Jersey.
Another type of distributed generation implemented by a utility company was the world's first grid-connected pole-attached solar panels of Public Service Enterprise Group in New Jersey. More than 174,000 PV panels are mounted on utility poles along streets of New Jersey with aggregated capacity of 40 MW.
, there were nearly 5,500 schools in the United States that had solar installations with the total capacity of approximately 910 MW. The top five states were Nevada, California, Hawaii, Arizona, and New Jersey with 23.10%, 14.50%, 14.50%, 14.10% and 13.00% of the schools in the respective states that had installations., there were total capacity of 2,562 MW of commercial solar installations from more than 4,000 companies in 7,400 locations. Top five corporations were Target, Walmart, Prologis, Apple, and Kohl's.
Solar cell manufacturing
In late September 2008, Sanyo Electric Company, Ltd. announced its decision to build a manufacturing plant for solar ingots and wafers in Salem, Oregon. The plant was scheduled to begin operating in October 2009 and scheduled to reach its full production capacity of 70 megawatts of solar wafers per year by April 2010. In April 2013 the plant closed its wafer slicing operation. In February 2016 the parent company, Panasonic, announced it would lay off 37% of the remaining workforce.In early October 2008, First Solar, Inc. broke ground on an expansion of its Perrysburg, Ohio, planned to add enough capacity to produce another 57 MW per year of solar modules at the facility, bringing its total capacity to roughly 192 MW per year. In November 2016 the company reduced the workforce in the Perrysburg plant by 20% as part of a worldwide restructuring.
In mid-October 2008, SolarWorld AG opened a manufacturing plant in Hillsboro, Oregon. In 2016 the Hillsboro plant was the largest photovoltaic technology manufacturing plant in the Western Hemisphere. It maintains 500 megawatts of cell-manufacturing capacity and 350 MW of module-assembly capacity.
Rapidly decreasing photovoltaic prices put General Electric's planned factory in Colorado on hold, and led to the bankruptcy of Konarka Technologies, which had expected to produce 1,000 MW of solar modules per year by 2011, and Solyndra, which defaulted on a $535 million loan guarantee, prompting Republican members of the Energy and Commerce committee to vote to cease accepting new applications to the loan program.
HelioVolt Corporation opened a manufacturing facility in Austin, Texas that will have an initial capacity to produce 20 MW of solar cells per year. Starting with solar "inks" developed at DOE's National Renewable Energy Laboratory that are deposited with ink jets, HelioVolt employs a proprietary "printing" process to produce solar cells consisting of thin films of copper indium gallium selenide, or CIGS. The technology won an R&D 100 Award in 2008 and it earned an Editor's Choice Award for Most Revolutionary Technology. HelioVolt's "FASST" reactive transfer printing process is 10–100 times faster than other CIGS production processes and can also be combined with vacuum evaporation or ultrasonic spray deposition techniques. At its new Austin manufacturing plant, HelioVolt plans to produce both solar modules and next-generation building-integrated solar products using its FASST process.
In 2012 the U.S. Department of Commerce placed a 31% tariff on solar cells made in China. In 2018, the Trump administration placed a 30% tariff on all imported solar equipment. In September 2014, SolarCity broke ground on a solar panel manufacturing plant in Buffalo, New York.
Upon its completion in 2016, it was projected to be the largest solar manufacturing facility in the Western hemisphere, with an annual manufacturing capacity of 1 gigawatt. However, as of 2019 the facility has not met the projections on production or job creation.
Concentrated solar power (CSP)
History
One of the first applications of concentrated solar was the solar powered motor made by H.E. Willsie and John Boyle in 1904.An early solar pioneer of the 19th and 20th century, Frank Shuman, built a demonstration plant that used solar power to pump water using an array of mirrors in a trough to generate steam. Located in Philadelphia, the solar water pump station was capable of pumping an hour at that latitude, corresponding to. After seven weeks of testing the plant was disassembled and shipped to Egypt for testing as an irrigation plant.
In 1973, Karl Böer of the University of Delaware built an experimental house called the Solar One, the first house to convert sunlight into energy.
Solar One, the first pilot solar power tower design was completed in 1981. The parabolic trough Solar Energy Generating Systems opened its first unit in 1984, the first major solar thermal plant in the world.
Selected list of plants
The United States pioneered solar tower and trough technologies. A number of different solar thermal technologies are in use in the U.S.:- The largest solar thermal power plant in the world is the 392 MW Ivanpah Solar Power Facility, in California. It deploys 173,500 heliostats each with two mirrors focusing solar energy on boilers located on centralized solar power towers. The facility opened on February 13, 2014.
- The Solana Generating Station is a solar power plant near Gila Bend, Arizona, about southwest of Phoenix, completed in 2013. When commissioned it was the largest parabolic trough plant in the world and the first U.S. solar plant with molten salt thermal energy storage. Built by the Spanish company Abengoa Solar, it has a total capacity of 280 megawatts, which is enough to power 70,000 homes while avoiding around 475,000 tons of carbon dioxide. Its name is the Spanish term for "sunny spot".
- The Martin Next Generation Solar Energy Center is a hybrid 75 megawatt parabolic trough solar energy plant that is owned by Florida Power & Light Company. The solar plant is a component of the 3,705 MW Martin County Power Plant, which is currently the single largest fossil fuel burning power plant in the United States. Completed at the end of 2010, it is located in western Martin County, Florida, just north of Indiantown.
- The Mojave Solar Project is a 280 MW solar thermal power facility in the Mojave Desert in California, which was completed in December 2014.
- The Crescent Dunes Solar Energy Project is a 110 MW solar thermal power project near Tonopah, about northwest of Las Vegas, which was completed in September 2015.
CSP capacity and generation
Abengoa's 280 MWac of CSP project was brought online in the 3rd quarter and Genesis Solar's first phase of 125 MWac was brought online in the 4th quarter of 2013 bringing the total to 410 MWac for the year and 918 MWac total. Ivanpah is already completed during the first quarter of 2014 the current world's largest CSP power plant is 392 MWac and brings the total to 1310 MWac.The 110 MWac Crescent Dunes project started commissioning during February.
The 250 MWac Mojave solar, second phase 125 MWac Genesis Solar, and Tooele Army Depot Solar's 1.5 MWac power plant are all expected to come online in 2014.
The A total of around 9.5 GW of solar PV and CSP capacity is expected to come on-line in 2016, more than any other source.
Government support
A complete list of incentives is maintained at the Database of State Incentives for Renewable Energy .Most solar power systems are grid connected and use net metering laws to allow use of electricity in the evening that was generated during the daytime.
New Jersey leads the nation with the least restrictive net metering law, while California leads in total number of homes which have solar panels installed. Many were installed because of the million solar roof initiative. In some states, such as Florida, solar power is subject to legal restrictions that discourage its use.
Federal
The federal tax credit for solar was extended for eight years as part of the financial bail out bill, H.R. 1424, until the end of 2016. It was estimated this will create 440,000 jobs, 28 gigawatts of solar power, and lead to a $300 billion market for solar panels. This estimate did not take into account the removal of the $2,000 cap on residential tax credits at the end of 2008. A 30% tax credit is available for residential and commercial installations. For 2009 through 2011 this was a 30% grant, not a tax credit, known as the 1603 grant program.The federal Residential Energy Efficient Property Credit for residential PV and solar thermal was extended in December 2015 to remain at 30% of system cost for systems put into service by the end of 2019, then 26% until the end of 2020, and then 22% until the end of 2021. It applies to a taxpayer's principal and/or second residences, but not to a property that is rented out. There is no maximum cap on the credit, and the credit can be applied toward the Alternative Minimum Tax, and any excess credit can be rolled into the following year. The solar industry and utilities clashed extensively on renewal, but the solar industry prevailed. The renewal is expected to add $38 billion of investment for 20 GigaWatts of solar.
Section 1603 grants
President Obama’s stimulus bill in 2009 created a program known as Section 1603 grants. The program was designed to give federal grants to solar companies for 30 percent of investments into solar energy. Since 2009, the federal government has given solar companies $25 billion in grant money through this program. The Section 1603 grant program expired in 2011.On June 9, 2016, Senator Orrin Hatch requested from Department of Treasury, the Internal Revenue Service and the Treasury Inspector General for Tax Administration details about how companies use Section 1603 grants and tax credits. In March 2016, Hatch asked the IRS and Treasury Department to demonstrate that the agencies use safeguards and coordinate with each other when reviewing applications for Section 1603 grants.
Solar America Initiative
The United States Department of Energy announced on September 29, 2008 that it will invest $17.6 million, subject to annual appropriations, in six company-led, early-stage photovoltaic projects under the Solar America Initiative's "PV Incubator" funding opportunity, designed to fund prototype PV components and systems with the goal of moving them through the commercialization process by 2010 and make it cost-competitive with conventional forms of electricity by 2015.SunShot Initiative
The SunShot Initiative aimed to reduce the cost of solar power by 75% from 2010 to 2020. The name is based on "moon shot", Kennedy's target of reaching the moon within the decade.Goals:
- Residential system prices reduced from $6/W to $1.50/W
- Commercial system prices reduced from $5/W to $1.25/W
- Utility-scale system prices reduced from $4/W to $1.00/W
Trump administration
State and local
State initiatives
- Governor Jerry Brown signed legislation requiring California's utilities to get 50 percent of their electricity from renewable energy sources by the end of 2030.
- The San Francisco Board of Supervisors passed solar incentives of up to $6,000 for homeowners and up to $10,000 for businesses. Applications for the program began on July 1, 2008. in April 2016, they passed a law requiring all new buildings below 10 stories to have rooftop solar panels, making it the first major U.S. city to do so
- In 2008, Berkeley initiated a revolutionary pilot program where homeowners are able to add the cost of solar panels to their property tax assessment, and pay for them out of their electricity cost savings. In 2009, more than a dozen states passed legislation allowing property tax financing. In all, 27 states offer loans for solar projects.
- The California Solar Initiative has set a goal to create 3,000 megawatts of new, solar-produced electricity by 2016.
- New Hampshire has a $3,750 residential rebate program for up to 50% of system cost for systems less than 5 kWp.
- Louisiana has a 50 per cent tax credit up to $12,500 for the installation of a wind or solar system.
- New Jersey law provides new solar power installations with exemptions from the 7% state sales tax, and from any increase in property assessment, subject to certain registration requirements.
Feed-in Tariffs
Solar Renewable Energy Certificates
In recent years, states that have passed Renewable Portfolio Standard or Renewable Electricity Standard laws have relied on the use of Solar renewable energy certificates to meet state requirements. This is done by adding a specific solar carve-out to the state Renewable Portfolio Standard. The first SREC program was implemented in 2005 by the state of New Jersey and has since expanded to several other states, including Maryland, Delaware, Ohio, Massachusetts, North Carolina and Pennsylvania.An SREC program is an alternative to the feed-in tariff model popular in Europe. The key difference between the two models is the market-based mechanism that drives the value of the SRECs, and therefore the value of the subsidy for solar. In a feed-in tariff model, the government sets the value for the electricity produced by a solar facility. If the level is higher, more solar power is built and the program is more costly. If the feed-in tariff is set lower, less solar power is built and the program is ineffective. The problem with SRECs is a lack of certainty for investors. A feed-in tariff provides a known return on investment, while an SREC program provides a possible return on investment.
Power Purchase Agreements
In 2006 investors began offering free solar panel installation in return for a 25-year contract, or Power Purchase Agreement, to purchase electricity at a fixed price, normally set at or below current electric rates. By 2009 over 90% of commercial photovoltaics installed in the United States were installed using a power purchase agreement. Approximately 90% of the photovoltaics installed in the United States is in states that specifically address power purchase agreements.New construction mandates
In March 2013, Lancaster California became the first U.S. city to mandate the inclusion of solar panels on new homes, requiring that "every new housing development must average 1 kilowatt per house."PACE
An innovative financing arrangement pioneered in Berkeley, California, and Palm Springs, lends money to a homeowner for a solar system, to be repaid via an additional tax assessment on the property for 20 years. This allows installation of the solar system at "relatively little up-front cost to the property owner." Now known as PACE, for Property Assessed Clean Energy, it is available in 28 states. Freddie Mac and Fannie Mae have objected to the repayment of solar loans being senior to mortgage loans, and some states have relegated PACE loans to junior loans. HR 2599 was introduced to prevent interference with the PACE program by other lenders. The principal feature of the program is that the balance of the loan is transferred to the new owners in the event the property is sold, and the loan is paid for entirely through electric bill savings. Unlike a mortgage loan, no funds are transferred when the property is sold - only the repayment obligation is transferred. PACE programs are currently operating in eight states, California, Colorado, Florida, Maine, Michigan, Missouri, New York, and Wisconsin, and are on hold in many others, pending resolution of the Freddie Mac, Fannie Mae objection.Controversy and congressional investigation
In 2016, the Senate Finance Committee and the House Ways and Means Committee ran a formal investigation into billions of dollars in tax incentives that solar-energy companies received. The investigation also focused on whether the Obama administration improperly gave out solar tax credits. The investigational probe was led by Senator Orrin Hatch, the chairman of the Senate Finance Committee, and U.S. Representative Kevin Brady, the chairman of the Ways and Means Committee.Generation (PV and CSP)
Source: NREL EIA.NREL includes distributed generation, EIA, including the monthly data above, includes only utility generation. "EIA % of total" is the percent of all electricity produced that is generated by utility solar.