Sources

Primary and secondary sources referenced across the site, by data class.

Electricity rates & usage

U.S. Energy Information Administration — Electric Power Monthly, May 2026 state averages (rates, usage, bills).
Utility tariff documents (PG&E, SCE, SDG&E, Oncor, CenterPoint, FPL, Duke, APS, SRP, ConEd, National Grid, NV Energy, LADWP, Austin Energy, CPS).

Cost per watt & system pricing

EnergySage Marketplace report (Q1 2026 median ≈ $2.95/W).
NREL — residential solar system cost benchmarks (≈ $2.62/W, 2025–26) and Solar Industry Update.
State-level market reports and installer survey data (2026).
Public pricing guides cross-checked for consistency (2025–2026).

Solar resource

NREL — GHI/PVWatts insolation data (used for latitude-based production factors).

Incentives & tax

IRS — Residential Clean Energy Credit guidance (§25D); §48E rules; FEOC/PFE sourcing regulations.
One Big Beautiful Bill Act (H.R. 1, 119th Congress), signed 2025-07-04.
State energy offices and public utility commissions (CA, NY, MA, TX, FL, AZ, NJ, IL, CO, and others).
DSIRE database (cross-reference for state programs).
Form 5695 and IRS carry-forward rules for 2025 installations.

Equipment

Manufacturer datasheets and warranty documents (Maxeon, REC, Q CELLS, Silfab, Canadian Solar, Trina, JA Solar, LONGi, Enphase, SolarEdge, Tesla, Fronius, SMA, Growatt, APSystems, FranklinWH, Panasonic, sonnen).
Installed battery price ranges: marketplace reports (2026).

Imagery

Photographs obtained via public image search (Dreamstime / Pexels / Vecteezy sources). License verification required before commercial launch — see note below.

Image licensing note: imagery on this site is illustrative. Before commercial launch, confirm or replace every image with properly licensed assets for your jurisdictions. We have not verified the redistribution terms of the stock sources.