About Energy Factbook

Updated September 04, 2026

Energy Factbook answers one question well: what does energy actually cost you? Numbers derive from official government data, primarily the U.S. Energy Information Administration, with the exact source, formula, and publication lag disclosed on every page; the few figures from non-government sources (AAA pump prices, company sustainability disclosures) are labeled as such where they appear.

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 No modeled estimates and no projections of unpublished months.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: contact@energyfactbook.com. Corrections are applied and noted on the affected page.