About Energy Factbook

Updated July 21, 2026

Energy Factbook answers one question well: what does energy actually cost you? Every number derives from official government data, primarily the U.S. Energy Information Administration, with the exact source, formula, and publication lag disclosed on every page.

What we do differently

• Official data first. No modeled estimates and no projections of unpublished months. Where no government source exists (50-state daily pump prices), we use the industry-standard source (AAA) and label it on the page and in the methodology.
• Radical methodology transparency. The methodology page names the exact series and formula behind every number on the site.
• A public revision log. When EIA revises history, we record it on the data updates page. Numbers never change silently.
• Genuinely fresh. The site rebuilds monthly from the source APIs after each EIA Electric Power Monthly release; the "Updated" date is a real refresh.

Who is behind Energy Factbook

Energy Factbook is a project of Daniel Simmons, principal of Simmons Energy & Environmental Strategies. Daniel has worked in energy and environmental policy for 28 years, including four years at the U.S. Department of Energy, where he served as the Senate-confirmed Assistant Secretary for Energy Efficiency and Renewable Energy, overseeing a research portfolio of roughly $2 billion a year covering renewable energy, transportation technologies, and manufacturing technologies. This site applies the approach that career was built on: lead with the data, name the source for every number, and let readers draw their own conclusions.

Contact

Questions or corrections: [email protected]. Corrections are applied and noted on the affected page.