Data for the Power Almanac come from a variety of sources, primarily government agencies and laboratories such as the U.S. Environmental Protection Agency, the U.S. Department of Energy, the U.S. Geological Survey, and the National Renewable Energy Laboratory. In most cases, the same data we use on the site are publicly available for download, although we have sometimes filtered and collated that data. Full descriptions of our data sources and our methods for preparing the data for use in the Almanac are available on the References & Data page, along with links to the data sources.