We collect data from a wide range of sources. The main ones are described below.
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 review these sources and gather details of new or updated projects.
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.
We use software to track online media comment about utility-scale solar installations and projects.
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, South Africa's Renewable Energy Independent Power Producers Programme and the Philippines Department of Energy.
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.
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.
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.
The main sources who maintain and publish data of relevance for utility-scale solar power are:
UNFCCC Clean Development Mechanism (CDM)
Diário Oficial da União; Agência Nacional de Energia Elétrica
Ministry of the Environment
El Centro Nacional para la Innovación y Fomento de las Energías Sustentables (CIFES)
National Energy Administration
Ministry of New and Renewable Energy (MNRE)
Gujarat Energy Development Agency
- Madhya Pradesh
New & Renewable Energy Department (MPNRED)
Rajasthan Renewable Energy Corporation
Department of Energy
Department of Energy and Climate Change (DECC)
Office of Gas and Electricity Markets (Ofgem)
Energy Information Administration (EIA)
Solar Energy Industries Association (SEIA)
California Independent System Operator (CAISO)
- North Carolina
North Carolina Utilities Commission (NCUC)
Maps and analysis are based on our database of more than 2,000 utility-scale solar projects - the world's most comprehensive.