Solar in Seattle, Washington
State-level figures below are sourced; city-specific claims carry an in-review label where unverified
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.
- Utility: Seattle City Light (and PSE)
- State guide: Washington — export rules, incentives, estimator
- Measured sun (Washington): {'abbr': 'wa', 'annual': 3.43, 'city': 'Olympia', 'lat': 47.045, 'lon': -122.902, 'm': [0.9, 1.5, 3.27, 4.36, 5.11, 5.84, 6.92, 5.11, 3.82, 2.26, 1.17, 0.83], 'name': 'Washington', 'tz': 'America/Los_Angeles'} (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: run the Washington estimator with your actual bill, then score three itemized bids with the quote scorecard.