Solar in Mercer Island, WA
With Puget Sound Energy's electricity at about 18.2¢ per kWh and 1,046 kWh of sun per kW, solar is worth it for a typical Mercer Island home today: about a 13.9-year payback.
- Payback, typical home
- 13.9 yrsWashington: 16.2 yrs
- 25-year net
- $30,736after paying $24,415
- Sun
- 1,046kWh per kW per year
- Electricity
- 18.2¢1% above U.S. average
A typical Mercer Island home, by the numbers
| Utility | Puget Sound Energy |
|---|---|
| Electricity use | 863 kWh a month |
| Best-value system | 8.9 kW, about 21 panels, 9,311 kWh a year (90% of use) |
| Cost | $24,415 |
| First-year savings | $1,591 |
| Payback | 13.9 years |
| Exported power | 13¢/kWh (Puget Sound Energy) |
Cash purchase, no federal credit, 3.8% yearly rate increases. Run it with your own numbers.
Homes in Mercer Island
- Owner-occupied homes
- 67%
- Single-family detached
- 67%
- Median home value
- $2.0M
- Median year built
- 1973
- Population
- 25,307
- Roofs suitable for solar†
- 78%
Census ACS 2020–2024. †Share of 5,996 buildings Google Project Sunroof rated technically suitable (2019 snapshot).
Older housing stock. Many homes here were built before 1975. Have the roof and electrical panel checked before signing; a roof or panel upgrade can add thousands. Roof first?
Installers working in Mercer Island
Public installation records for Washington don't name installers, so we can't rank local companies here. Browse installers in Washington.
Always verify the license and get at least three quotes. Compare quotes side by side.
Questions about solar in Mercer Island
Is solar worth it in Mercer Island, WA?
For a typical home in Mercer Island, solar is worth it at 2026 prices: a 8.9 kW system costs about $24,415 after state incentives, saves about $1,591 in year one and pays back in about 13.9 years. Enter your address for an estimate based on your roof and bill.
How much solar power does a system produce in Mercer Island?
About 1,046 kWh per year for each kW of panels on a south-facing roof, based on PVWatts and local weather. That's 6% less than the Washington average. East- or west-facing roofs produce roughly 10–20% less.
Who is the electric utility in Mercer Island?
Most homes in Mercer Island are served by Puget Sound Energy, at about 18.2¢ per kWh on average. Some areas are served by City of Seattle.
How much do solar panels cost in Mercer Island?
A fair cash price is around $2.85 per watt before incentives, so about $24,415 for a 8.9 kW system. There's no federal tax credit for homeowners who buy in 2026.
Nearby
- Bellevue 13.6 yrs
- Renton 13.9 yrs
- Seattle 15.9 yrs
- Burien 13.2 yrs
- Issaquah 13.8 yrs
- SeaTac 13.5 yrs
- Sammamish 14.1 yrs
- Kirkland 13.3 yrs
- All of Washington
Data: PVWatts (National Laboratory of the Rockies), EIA-861 2025 adjusted to 2026, U.S. Census ACS, LBNL Tracking the Sun, state policy research as of October 2026.