Washington · city guide
Solar in Seattle, Washington: city-level honesty
Seattle is the honest counter-example: low measured sun, cheap hydro power, a grid that is already clean. The numbers rarely favor a rooftop system there — the Washington guide says so plainly, and that plainness is the point of this site.
UtilitySeattle City Light (and PSE)
Sun (state)3.43 kWh/m²/dayState guideWashingtonCity claimsIn review until verified
Honesty gate: state-level figures below are sourced; city-specific claims stay labeled in review until verified against primary local data.
- Utility: Seattle City Light (and PSE)
- State guide: Washington — export rules, incentives and source notes
- Measured sun (Washington): 3.43 kWh/m²/day (source: 2024 solar radiation (GHI, kWh/m2/day) at each state's capital, Open-Meteo archive (ERA5 reanalysis), measured daily sums -> monthly means, fetched 2026-08-08. State-wide average for the capital's site; an exact roof differs (tilt, shade).)
What standing here means
Washington's measured sun data and state policy are on the Washington page; compare before you buy.
The honest next step
City-level numbers come from real quotes, not websites: use the solar planning calculator with your bill and utility assumptions, then score three itemized bids with the quote scorecard.