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Spotted a wrong number or have a question about the method? Email twoface692@gmail.com.

Estimates for planning only — not a quote, and not financial or tax advice. Your roof, shading, utility rate plan and installer pricing change the numbers; get several quotes before deciding.

Solar production: PVWatts® (NREL, now the National Laboratory of the Rockies), NSRDB typical-year weather. Electricity prices and usage: U.S. Energy Information Administration (prices through July 2026). Installed costs: Berkeley Lab, 2025 installs.

Place data: GeoNames.org, used under CC BY 4.0.

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