In short: Butte-Silver Bow has about 35,500 people and sits in Silver Bow County. NorthWestern Energy LLC serves the county, averaging 14.23¢ per kWh for homes in 2024 (EIA). FEMA rates Silver Bow County winter weather “relatively high”. Rooftop solar here makes roughly 1,230 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 Butte-Silver Bow: its utility, outage records, sunshine, weather risks and charging. Statewide rules such as net metering, incentives and electrician licensing are in our Montana energy guide.
Butte-Silver Bow at a glance
- Place: Butte-Silver Bow, Silver Bow County, Montana; about 35,480 residents (Census Bureau estimate, July 2024).
- Utility: NorthWestern Energy LLC (investor-owned). Homes paid an average 14.23¢ per kWh in 2024 (EIA-861); the average customer lost 118 minutes of power on normal days and 233 counting major storms, with 1.0 interruptions a year (utility-wide, not just Butte-Silver Bow).
- Sun: 4.22 kWh per square meter per day on average, from 1.35 in December to 7.27 in July (NASA POWER). Our rough estimate: about 1,230 kWh a year per kW of panels.
- Climate: about 110 cooling degree-days and 9,540 heating degree-days a year (base 65°F, NASA POWER), so heating is the big load.
- Top hazards in Silver Bow County: winter weather “relatively high”, landslides “relatively moderate” and cold waves “relatively moderate” (FEMA National Risk Index; overall county risk rated “very low”).
Your utility and what it means
NorthWestern Energy LLC is an investor-owned utility and served about 328,125 home customers in 2024; its 14.23¢ average was below the 14.99¢ 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, NorthWestern Energy LLC reported 118 minutes per customer without major storms in 2024, less than the statewide figure of 157 (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 Montana guide and then ask your utility for its current interconnection steps before you sign anything.
Backup power in Butte-Silver Bow
- Winter weather (relatively 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.
- 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 Butte-Silver Bow
By our rough estimate each kW of panels makes about 1,230 kWh a year in Butte-Silver Bow (NASA sunshine data times 365 days times 0.80 for system losses). Valued at NorthWestern Energy LLC’s 2024 average of 14.23¢, that is about $175 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 7.27 and December the dimmest at 1.35, a 5.4-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. The federal station list shows few or no public chargers listed under Butte-Silver Bow, so a home charger matters more here: see the EV charging cost calculator and EV charger installation.
Drive on another fuel? See every alternative fuel station in Butte-Silver Bow: 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 Butte-Silver Bow building or permitting department, or from Silver Bow County if you live outside city limits, and often a utility interconnection approval. We have not verified a local permit page for Butte-Silver Bow, so check the city and county websites or ask your electrician, who will know the process. Hire only a licensed electrician or installer; the Montana guide lists the state licensing rules.
Nearby guides
More local guides: Anaconda-Deer Lodge County, or the whole Montana energy guide.
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Butte-Silver Bow energy FAQ
Who is my electric company in Butte-Silver Bow?
Federal data lists NorthWestern Energy LLC as the main utility serving Silver Bow County. Small areas can be served by a different company or a co-op, so confirm on your bill.
How much power will solar make in Butte-Silver Bow?
About 1,230 kWh a year per kW of panels by our estimate, so a 6 kW system would make roughly 7,380 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 Silver Bow 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.
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 Butte-Silver Bow?
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.