In short: Sunnyvale has about 156,800 people and sits in Santa Clara County. Pacific Gas & Electric Co., City of Santa Clara and City of Palo Alto serves different parts of Santa Clara County, so your utility depends on your address; their 2024 home averages range from 16.88¢ to 39.62¢ per kWh (EIA). FEMA rates Santa Clara County earthquakes “very high”. Rooftop solar here makes roughly 1,380 kWh a year per kW of panels by our estimate, which is good for solar.
This page covers what is local to Sunnyvale: its utility, outage records, sunshine, weather risks and charging. Statewide rules such as net metering, incentives and electrician licensing are in our California energy guide.
Sunnyvale at a glance
- Place: Sunnyvale, Santa Clara County, California; about 156,792 residents (Census Bureau estimate, July 2024).
- Utility: Pacific Gas & Electric Co. (investor-owned). Homes paid an average 39.62¢ per kWh in 2024 (EIA-861); the average customer lost 276 minutes of power on normal days and 509 counting major storms, with 1.8 interruptions a year (utility-wide, not just Sunnyvale).
- Utility: City of Santa Clara (city-owned). Homes paid an average 16.88¢ per kWh in 2024 (EIA-861); the average customer lost 162 minutes of power on normal days and 209 counting major storms, with 0.8 interruptions a year (utility-wide, not just Sunnyvale).
- Utility: City of Palo Alto (city-owned). Homes paid an average 20.67¢ per kWh in 2024 (EIA-861) (utility-wide, not just Sunnyvale).
- Sun: 4.74 kWh per square meter per day on average, from 2.13 in December to 7.28 in June (NASA POWER). Our rough estimate: about 1,380 kWh a year per kW of panels.
- Climate: about 670 cooling degree-days and 2,840 heating degree-days a year (base 65°F, NASA POWER), so heating and cooling both matter.
- Top hazards in Santa Clara County: earthquakes “very high”, river and heavy-rain flooding “very high” and landslides “relatively high” (FEMA National Risk Index; overall county risk rated “very high”).
- Public charging: 518 ports at 200 locations in Sunnyvale, 90 of them DC fast (AFDC, October 20, 2026).
Your utility and what it means
Pacific Gas & Electric Co. is an investor-owned utility and served about 1,856,780 home customers in 2024; its 39.62¢ average was above the 33.61¢ statewide average for July 2026. City of Santa Clara is a city-owned utility and served about 50,949 home customers in 2024; its 16.88¢ average was below the 33.61¢ statewide average for July 2026. City of Palo Alto is a city-owned utility and served about 26,249 home customers in 2024; its 20.67¢ average was below the 33.61¢ 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, Pacific Gas & Electric Co. reported 276 minutes per customer without major storms in 2024, more than the statewide figure of 158 (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 California guide and then ask your utility for its current interconnection steps before you sign anything.
Backup power in Sunnyvale
- 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.
- 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 Sunnyvale
By our rough estimate each kW of panels makes about 1,380 kWh a year in Sunnyvale (NASA sunshine data times 365 days times 0.80 for system losses). Valued at Pacific Gas & Electric Co.’s 2024 average of 39.62¢, that is about $547 a year per kW if all of it offsets your own use (an estimate, not a promise). Production swings with the seasons: June is the sunniest month at 7.28 and December the dimmest at 2.13, a 3.4-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. Sunnyvale has 518 public charging ports in the federal station list including 90 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 Sunnyvale: 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 Sunnyvale building or permitting department, or from Santa Clara County if you live outside city limits, and often a utility interconnection approval. We have not verified a local permit page for Sunnyvale, so check the city and county websites or ask your electrician, who will know the process. Hire only a licensed electrician or installer; the California guide lists the state licensing rules.
Nearby guides
More local guides: Fremont, San Jose, Hayward and Oakland, or the whole California energy guide.
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Sunnyvale energy FAQ
Who is my electric company in Sunnyvale?
Pacific Gas & Electric Co., City of Santa Clara and City of Palo Alto all serve parts of Santa Clara County. Which one serves you depends on your street, so check the top of your bill. Their 2024 home price averages differ (Pacific Gas & Electric Co. 39.62¢, City of Santa Clara 16.88¢, City of Palo Alto 20.67¢) so it matters for solar math.
How much power will solar make in Sunnyvale?
About 1,380 kWh a year per kW of panels by our estimate, so a 6 kW system would make roughly 8,280 kWh. Shade, roof direction and tilt change this; run your address through the solar potential tool for a better number.
Do I need a permit for solar or a generator in Sunnyvale?
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.