Where does the Wiki-Solar Database get its information?

We collect data from a wide range of sources. The main ones are described below.

Official sources

Some agencies maintain and routinely publish data on projects which include large-scale solar power generation. The main such sources are listed on the right.

We regularly receive information from these sources and gather details of new or updated projects.

Major industry players

We collaborate with many of the major participants in the sector listed in the pages in this section. They  provide us periodically with lists of their qualifying projects, or have a comprehensive references section in their websites.

Other project participants

Companies involved in individual projects are encouraged to keep us informed by using our simple on-line notification facilities for new or amended project data.

Press and media reports

We use software to track online media comment about utility-scale solar installations and projects.

Official program announcements

Some official agencies, who no not maintain project information in real time (as described above and on the right) do make periodic announcements about specific programs, and provide lists of participating projects. This includes, for example, India's Jawaharlal Nehru National Solar Mission and South Africa's Renewable Energy Independent Power Producers Programme.

Other listing sources

Others periodically list the leading solar power projects. This article in Wikipedia, for example was helpful in our early days, but now tends to follow Wiki-Solar.

Validating the data

Collecting the data is often the easy part. We then need to undertake a substantial vetting exercise to establish which projects are sufficiently concrete to meet our criteria. We also need extensive duplication checking because many projects are obtained through several of the above channels, not always using the same name or details; and we need to ensure that we do not list the same project more than once.

We apply consistency-checking to ensure that key data, such as rated power capacity and site area, are not incompatible with other nearby projects.Wider tolerances are accepted on parameters such as annual output, carbon savings and households served; because sources use a variety of algorythms to derive these figures, and they can be affected by factors such as tracking and site shading. We do not unilaterally modify received data without compelling reasons or evidence.

The site coordinates may be estimated based on the reported project location, and are validated using satellite imagery where possible. Where such images are available, we may recalculate site area, as indicated in accordance with this location data.

How 'fresh' is the data?

The Wiki-Solar Database is updated in real time against public announcements, and regularly against official sources. All marketplace outputs incorporate the latest data at the time they are produced.

The maps are updated whenever there have been a significant number of new or updated projects. This means typically every 2-4 weeks.

Primary official sources

The main sources who maintain and publish data of relevance for utility-scale solar power are:




UNFCCC Clean Development Mechanism (CDM)


Ministerio de Energía y Minería


Diário Oficial da União; Agência Nacional de Energia Elétrica (ANEEL);

Cámara de Comercialização de Energia Elétrica (CCEE)


Independent Electricity Systems Operator (IESO)

- Ontario

Ministry of the Environment


El Centro Nacional para la Innovación y Fomento de las Energías Sustentables (CIFES);

Comisión Nacional de Energía


National Energy Administration


Danish Energy Agency (DEA)


Commission de Régulation de l'Energie (CRE); Ministère de la Transition écologique et solidaire




Regulatory Authority for Energy


Ministry of New and Renewable Energy (MNRE); Solar Energy Corporation of India (SECI)

- Gujarat

Energy Development Agency

- Madhya Pradesh

New & Renewable Energy Department (MPNRED)

- Punjab 

Energy Development Agency

- Rajasthan

Renewable Energy Corporation


Energy Commission of Malaysia


Centro Nacional de Control de Energía (CeNaCE)


Ministry of Energy, Mines, Water and Environment (MEM)


Department of Energy


Direção-Geral de Energia e Geologia (DGEG)


Ministry of Energy of the Russian Federation (Minenergo)

South Africa

Department of Energy


Türkiye Elektrik İletim (TEIAS)

United Kingdom

Department of Energy and Climate Change (DECC now BEIS); Office of Gas and Electricity Markets (Ofgem)

United States

Energy Information Administra-tion (EIA); Bureau of Land Management (BLM); Solar Energy Industries Association

- California

Independent System Operator (CAISO)

- Idaho

Public Utilities Commission (IDPUC)

- Nevada

Public Utilities Commission (PUCN)

- North Carolina

Utilities Commission (NCUC)

Wiki-Solar Database

Maps and analysis are based on our database of more than 2,000 utility-scale solar projects - the world's most comprehensive.