In short: Sammamish has about 66,500 people and sits in King County. Puget Sound Energy Inc, City of Seattle and City of Tacoma serves different parts of King County, so your utility depends on your address; their 2024 home averages range from 10.81¢ to 14.63¢ per kWh (EIA). FEMA rates King County earthquakes “very high”. Rooftop solar here makes roughly 1,000 kWh a year per kW of panels by our estimate, which is on the modest side, so price and incentives matter more.
This page covers what is local to Sammamish: its utility, outage records, sunshine, weather risks and charging. Statewide rules such as net metering, incentives and electrician licensing are in our Washington energy guide and the wider area is covered in the Seattle–Tacoma guide.
Sammamish at a glance
- Place: Sammamish, King County, Washington; about 66,474 residents (Census Bureau estimate, July 2024).
- Utility: Puget Sound Energy Inc (investor-owned). Homes paid an average 14.63¢ per kWh in 2024 (EIA-861); the average customer lost 203 minutes of power on normal days and 1,196 counting major storms, with 1.2 interruptions a year (utility-wide, not just Sammamish).
- Utility: City of Seattle (city-owned). Homes paid an average 14.09¢ per kWh in 2024 (EIA-861); the average customer lost 111 minutes of power on normal days and 324 counting major storms, with 0.8 interruptions a year (utility-wide, not just Sammamish).
- Utility: City of Tacoma (city-owned). Homes paid an average 10.81¢ per kWh in 2024 (EIA-861); the average customer lost 80 minutes of power on normal days and 171 counting major storms, with 0.6 interruptions a year (utility-wide, not just Sammamish).
- Sun: 3.42 kWh per square meter per day on average, from 0.85 in December to 6.33 in July (NASA POWER). Our rough estimate: about 1,000 kWh a year per kW of panels.
- Climate: about 130 cooling degree-days and 6,410 heating degree-days a year (base 65°F, NASA POWER), so heating is the big load.
- Top hazards in King County: earthquakes “very high”, river and heavy-rain flooding “very high” and avalanches “very high” (FEMA National Risk Index; overall county risk rated “very high”).
- Public charging: 35 ports at 10 locations in Sammamish, 16 of them DC fast (AFDC, October 20, 2026).
Your utility and what it means
Puget Sound Energy Inc is an investor-owned utility and served about 1,091,599 home customers in 2024; its 14.63¢ average was close to the 14.71¢ statewide average for July 2026. City of Seattle is a city-owned utility and served about 459,964 home customers in 2024; its 14.09¢ average was below the 14.71¢ statewide average for July 2026. City of Tacoma is a city-owned utility and served about 180,357 home customers in 2024; its 10.81¢ average was below the 14.71¢ statewide average for July 2026. Those are utility-wide averages, not a quote for your address; your own bill is the real number.
For reliability, Puget Sound Energy Inc reported 203 minutes per customer without major storms in 2024, more than the statewide figure of 159 (EIA-861). Utility-wide numbers hide a lot: a home at the end of a long rural line usually has more outages than the average.
Net metering, export rates and incentives are set at state level and by each utility. Start with the Washington guide and then ask your utility for its current interconnection steps before you sign anything.
Backup power in Sammamish
- Earthquakes (very high): Earthquake risk is mainly about secure mounting and gas shut-off for generators; ask the installer to follow local seismic requirements.
- River and heavy-rain flooding (very high): Heavy rain can flood basements and take out power. Put sump pumps on backup power and keep equipment above the flood line.
- Heating load: a winter outage can stop a furnace blower, boiler pump or heat pump. List what your heat needs to run before choosing a generator or battery.
- Short outages: a portable power station covers phones, Wi-Fi, a CPAP and lights; a home battery switches over automatically.
Size your setup with the generator sizing tool and the battery backup calculator, and compare options in backup power. Generator safety (CPSC): outdoors only, at least 20 feet from the house, exhaust away from doors and windows, never in a garage, and battery-powered carbon monoxide alarms inside. A licensed electrician should install any transfer switch, with a permit; see generator installation.
Solar in Sammamish
By our rough estimate each kW of panels makes about 1,000 kWh a year in Sammamish (NASA sunshine data times 365 days times 0.80 for system losses). Valued at Puget Sound Energy Inc’s 2024 average of 14.63¢, that is about $146 a year per kW if all of it offsets your own use (an estimate, not a promise). Production swings with the seasons: July is the sunniest month at 6.33 and December the dimmest at 0.85, a 7.4-to-1 gap, so a battery or a bigger system helps in winter.
Check your own roof with the solar potential tool, see solar costs and net metering vs net billing, and read the steps in solar installation.
Batteries and EV charging
A home battery earns its place when outages are frequent, when your utility pays little for exported solar, or when evening prices are high; compare in home batteries and battery costs. Sammamish has 35 public charging ports in the federal station list including 16 DC fast, but home charging is cheaper and easier: see the EV charging cost calculator and EV charger installation.
Drive on another fuel? See every alternative fuel station in Sammamish: hydrogen, propane, natural gas, E85 ethanol, biodiesel and renewable diesel.
Permits and inspections
Solar, generator transfer switches and EV chargers normally need an electrical permit from the Sammamish building or permitting department, or from King County if you live outside city limits, and often a utility interconnection approval. We have not verified a local permit page for Sammamish, so check the city and county websites or ask your electrician, who will know the process. Hire only a licensed electrician or installer; the Washington guide lists the state licensing rules.
Nearby guides
More local guides: Seattle–Tacoma energy guide, Bellevue, Redmond, Kirkland and Renton, or the whole Washington energy guide.
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Sammamish energy FAQ
Who is my electric company in Sammamish?
Puget Sound Energy Inc, City of Seattle and City of Tacoma all serve parts of King County. Which one serves you depends on your street, so check the top of your bill. Their 2024 home price averages differ (Puget Sound Energy Inc 14.63¢, City of Seattle 14.09¢, City of Tacoma 10.81¢) so it matters for solar math.
How much power will solar make in Sammamish?
About 1,000 kWh a year per kW of panels by our estimate, so a 6 kW system would make roughly 6,000 kWh. Shade, roof direction and tilt change this; run your address through the solar potential tool for a better number.
Will a home battery keep my heat on in an outage?
It can keep a furnace blower, boiler pump or a heat pump running for a while, but long cold outages drain a battery fast without solar to recharge it. Pair it with a generator or wood or propane heat if outages here run for days.
Do I need a permit for solar or a generator in Sammamish?
Almost always an electrical permit for a transfer switch, solar or an EV charger, issued by the city or county where you live. Your licensed electrician or installer normally pulls it. Never connect a generator to your house wiring without a transfer switch.
Sources: EIA Form 861 (2024) for utility prices and outages; NASA POWER climatology (2001 to 2025) for sun and degree-days; FEMA National Risk Index for county hazards; AFDC station locator for public charging; Census Bureau for population. Estimates are ours and are not promises; see our editorial policy. Prices and programs change, so check each program page.