Methodology

TODO: Explain the calculation steps, data sources, and assumptions behind the calculators.

TODO: Note that no federal tax credit is applied for installs in 2026 and later.

Utility rate sources

Rates come from each utility's own published tariff or rate pages. The page we read for each one:

Florida

• Florida Power & Light (FPL), schedule RS-1 (read 2026-10-22)
• Duke Energy Florida, schedule RS-1 (read 2026-10-22)
• Tampa Electric (TECO), schedule RS (read 2026-10-22)

California

• Pacific Gas and Electric (PG&E), schedule E-TOU-C (read 2026-10-22)
• Southern California Edison (SCE), schedule TOU-D-4-9PM (read 2026-10-22)
• San Diego Gas & Electric (SDG&E), schedule TOU-DR1 (read 2026-10-22)