In short: Brentwood is in Suffolk County. Long Island Power Authority and Fishers Island Utility Co Inc serves different parts of Suffolk County, so your utility depends on your address; their 2024 home averages range from 24.57¢ to 38.17¢ per kWh (EIA). FEMA rates Suffolk County winter weather “very high”. Rooftop solar here makes roughly 1,170 kWh a year per kW of panels by our estimate, which is about average for the U.S..
This page covers what is local to Brentwood: its utility, outage records, sunshine, weather risks and charging. Statewide rules such as net metering, incentives and electrician licensing are in our New York energy guide.
Brentwood at a glance
- Place: Brentwood, Suffolk County, New York.
- Utility: Long Island Power Authority (publicly owned). Homes paid an average 24.57¢ per kWh in 2024 (EIA-861); the average customer lost 59 minutes of power on normal days, with 0.7 interruptions a year (utility-wide, not just Brentwood).
- Utility: Fishers Island Utility Co Inc (investor-owned). Homes paid an average 38.17¢ per kWh in 2024 (EIA-861) (utility-wide, not just Brentwood).
- Sun: 4.01 kWh per square meter per day on average, from 1.59 in December to 6.18 in July (NASA POWER). Our rough estimate: about 1,170 kWh a year per kW of panels.
- Climate: about 820 cooling degree-days and 5,210 heating degree-days a year (base 65°F, NASA POWER), so heating and cooling both matter.
- Top hazards in Suffolk County: winter weather “very high”, coastal flooding “very high” and lightning “very high” (FEMA National Risk Index; overall county risk rated “relatively high”).
- Public charging: 58 ports at 15 locations in Brentwood, none of them DC fast (AFDC, October 20, 2026).
Your utility and what it means
Long Island Power Authority is a publicly owned utility and served about 1,029,943 home customers in 2024; its 24.57¢ average was below the 29.9¢ statewide average for July 2026. Fishers Island Utility Co Inc is an investor-owned utility and served about 657 home customers in 2024; its 38.17¢ average was above the 29.9¢ 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, Long Island Power Authority reported 59 minutes per customer without major storms in 2024, less than the statewide figure of 72 (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 New York guide and then ask your utility for its current interconnection steps before you sign anything.
Backup power in Brentwood
- Winter weather (very high): Winter storms and cold snaps combine outages with heating demand. Plan for the furnace blower or heat pump, not just lights, and keep a fuel supply you can reach in snow.
- Coastal flooding (very high): Coastal flooding means keeping batteries, generators and electrical panels above flood level; ask a licensed electrician about elevating equipment.
- 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 Brentwood
By our rough estimate each kW of panels makes about 1,170 kWh a year in Brentwood (NASA sunshine data times 365 days times 0.80 for system losses). Valued at Long Island Power Authority’s 2024 average of 24.57¢, that is about $287 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 6.18 and December the dimmest at 1.59, a 3.9-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. Brentwood has 58 public charging ports in the federal station list (none of them 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 Brentwood: 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 Brentwood building or permitting department, or from Suffolk County if you live outside city limits, and often a utility interconnection approval. We have not verified a local permit page for Brentwood, so check the city and county websites or ask your electrician, who will know the process. Hire only a licensed electrician or installer; the New York guide lists the state licensing rules.
Nearby guides
More local guides: Lindenhurst, Levittown, Freeport and Hempstead, or the whole New York energy guide.
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Brentwood energy FAQ
Who is my electric company in Brentwood?
Long Island Power Authority and Fishers Island Utility Co Inc both serve parts of Suffolk County. Which one serves you depends on your street, so check the top of your bill. Their 2024 home price averages differ (Long Island Power Authority 24.57¢, Fishers Island Utility Co Inc 38.17¢) so it matters for solar math.
How much power will solar make in Brentwood?
About 1,170 kWh a year per kW of panels by our estimate, so a 6 kW system would make roughly 7,020 kWh. Shade, roof direction and tilt change this; run your address through the solar potential tool for a better number.
Is a generator or a battery better for winter weather in Suffolk County?
It depends how long the outage lasts. A battery is quiet, automatic and good for short outages and for pairing with solar; a standby generator keeps going as long as it has fuel, which suits multi-day events. Many homes use a battery for everyday outages and add a generator for the rare long one.
Do I need a permit for solar or a generator in Brentwood?
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.