Energy Factbook is an energy-data and information project that helps readers understand U.S. and global energy costs, production, markets, and air quality. It presents clear explanations, useful charts, and linked sources, with figures dated so readers can see when the underlying data apply. The site draws primarily on official government and statistical sources, especially the U.S. Energy Information Administration, and explains how figures are calculated, updated, and revised.

Its coverage includes gasoline prices, oil and refining, the Strategic Petroleum Reserve, electricity rates and generation, household energy costs, world comparisons, and air-quality trends. Visitors can explore local costs by ZIP code, state, or metro area, compare data by country, and learn about topics such as home heating, heat pumps, rooftop solar, and electric vehicles versus gasoline cars. Explainers address questions including why fuel prices or electric bills rise and what energy and air-quality statistics can—and cannot—show. Energy Factbook also provides sources and methods, data updates, and correction information.