A note on Montana's market: Retail choice was repealed for residential customers in 2007 after the state's deregulation experiment failed; only certain large customers retain choice.
What the Average Electric Bill in Montana Actually Is
The average Montana household pays about $124.99 a month for electricity — roughly 21 percent below the national average of $159.14. That comes from a rate of 14.67 cents per kilowatt-hour as of May 2026, about 20 percent under the national 18.44 cents, and consumption of 852 kilowatt-hours a month, which is fractionally below the national average of 863.
That last figure surprises people. Montana has one of the most demanding heating climates in the United States, with sustained subzero stretches and a heating season that can run from October into May, and yet its households use slightly less electricity than the national norm. The explanation is straightforward once stated: most of Montana's winter energy never touches the electric meter. Natural gas heats a large share of homes along the populated corridors, and propane, fuel oil, and wood carry much of the rest in rural areas and at elevation. Add a cooling season that is short, dry, and in many places nearly optional, and the electric bill ends up representing a smaller slice of total household energy spending than it does almost anywhere else.
The consequence for anyone benchmarking themselves is important: a low Montana electric bill is not evidence of a cheap energy household. It is often evidence that the expensive part of the year is being billed by someone else. Households heating with electric resistance or heat pumps see a completely different curve, with January and February bills that can be triple their July ones. The electricity bill calculator will give you your own number; the state average is close to meaningless for an all-electric home here.
Why Montana Electricity Costs About 14.7 Cents
Montana's rate reflects an unusual generation history. The state was built on hydroelectric dams — a resource with essentially no fuel cost, very long asset life, and output that varies with snowpack and runoff rather than with commodity markets — supplemented for decades by large coal-fired capacity at Colstrip, sited directly on the coal seam so that fuel transport costs are negligible. Wind development has since added capacity in a state with genuinely excellent wind resource. All of that pushes generation costs down.
Delivery pushes the other way, hard. Montana is the fourth-largest state by area with a small population, and the distribution and transmission systems must cross enormous distances to reach relatively few meters. Line-miles per customer here are among the highest anywhere, and every mile requires inspection, vegetation management, storm repair, and eventual replacement. Wildfire risk has added materially to that cost in recent years through hardening programs, insurance, and liability exposure. Those fixed network costs are why Montana's rate is not lower still despite cheap generation.
The other factor is history. Montana restructured its electricity market in the late 1990s, its incumbent utility sold off its generating assets, and the state's largest utility spent much of the following two decades buying power on the market and then reacquiring generation — including hydro capacity it had previously owned. The costs of that round trip flow through rates. It is a specific, expensive reason Montanans pay what they pay, and it is also the reason the state no longer offers residential retail choice.
Why Montana Households Use Only 852 kWh a Month
Four things hold Montana's electric consumption near the national average despite the climate.
- Heating is mostly not electric. Natural gas serves much of Billings, Missoula, Great Falls, Bozeman, and the other population centers. Outside the gas mains, propane, fuel oil, and wood stoves do the work. All of that heating energy is real and expensive, but it is invoiced somewhere other than the electric bill.
- The cooling season barely exists in electrical terms. Montana summers are warm and very dry, nights cool off sharply at elevation, and a large share of the housing stock has no central air conditioning at all. Evaporative cooling and open windows do work that in the Southeast would require a compressor running all night.
- Dry air is cheap air. Where cooling does run, the absence of humidity means the system spends nothing on dehumidification, which is a substantial share of an air conditioner's work in a humid climate.
- Housing is not oversized. Montana's median home is not unusually large, and newer construction in the state has been built to codes that take a cold climate seriously.
The households that break this pattern are the all-electric ones: homes off the gas main heating with baseboard resistance or with air-source heat pumps that lose capacity and fall back on backup heat during a genuine cold snap. Those households can post winter bills several times the state average, and for them the relevant benchmark is not 852 kWh but their own December through February usage. Comparing a baseboard-heated cabin outside Kalispell to a gas-heated townhouse in Billings is not a comparison of energy efficiency; it is a comparison of fuel choices.
What You Can Control in a State That Repealed Choice
Montana deregulated its retail electricity market in the 1990s and then reversed course: retail choice was repealed for residential customers in 2007 after the deregulation experiment failed, and only certain large customers retain the ability to shop. For a household, that settles the question — there is no supplier market, no contract to sign, and no cheaper rate to hunt for. Anyone offering you one is not describing a product that exists in Montana. If you want the background on which states do and do not have retail markets, the regulated states overview lays out the map.
What remains is genuinely worth doing:
- Understand which fuel is actually costing you money. In a gas-heated Montana home, chasing electric savings while ignoring the heating system is optimising the smaller number. Add the gas and electric bills together for a full year before deciding where to spend.
- Envelope work outperforms equipment here. In a climate with several thousand more heating degree days than the national norm, air sealing and attic insulation return more per dollar than almost any appliance swap. Rim joists, attic hatches, and duct leakage into unheated crawlspaces are the usual culprits.
- Backup heat management. If you run a heat pump, know at what outdoor temperature it hands off to resistance backup and avoid deep thermostat setbacks that force a hard morning recovery.
- Levelized billing smooths a bill curve that is steep in this state. It changes timing, not totals.
- Rate cases and co-op board elections are the actual points of influence. In a regulated state these are the only formal levers a customer has over price, and turnout in cooperative board elections is typically very low.
The Utilities Serving Montana and How They Differ
Montana's customers are split across three fundamentally different kinds of provider, and the type matters more here than in most states.
NorthWestern Energy is the dominant investor-owned utility, serving much of the western and central population base including Butte, Helena, Bozeman, Missoula, and Great Falls. It is regulated by the Montana Public Service Commission, which approves its rates through contested rate cases, and it is a combination utility selling both electricity and natural gas in much of its territory. Its portfolio is a mix of hydro, thermal capacity, wind, and market purchases, and the balance between owned generation and purchased power is a recurring subject of regulatory dispute.
Montana-Dakota Utilities serves eastern Montana, a very different service area: sparse, agricultural, and connected to a system that extends across the Dakotas. It is also a combination gas and electric utility, and is likewise PSC-regulated.
Electric cooperatives cover an enormous share of Montana by land area, including Flathead Electric Cooperative in the northwest, one of the largest. Co-ops are owned by the customers they serve, governed by boards those members elect, and their rates are not set by the Public Service Commission. Many Montana co-ops purchase federal hydropower at preference rates, which is a structural cost advantage no investor-owned utility can access. That single difference — who you buy wholesale power from — often explains more about a Montana rate than anything about the retail utility itself.
The practical upshot: before comparing your bill to someone else's, establish whether you are both on the same type of system. An investor-owned rate and a federal-preference-power co-op rate are not measuring the same thing.
Snowpack, Wildfire, and What Moves Montana Rates
Two physical variables affect Montana electricity costs in ways that have no equivalent in most states.
Snowpack. Hydroelectric output depends on runoff, and runoff depends on winter snow. A poor snow year reduces the cheapest generation on the system and forces utilities to replace it with market purchases or thermal generation at higher cost. That replacement cost eventually reaches customers. In hydro-heavy systems, the water year is a rate variable, and it operates on a lag of months to years rather than showing up immediately.
Wildfire. Utility wildfire risk has reshaped cost structures across the West, and Montana is not exempt. System hardening, expanded vegetation management, weather monitoring, insurance premiums, and liability reserves all raise the delivery side of the bill. These are not discretionary expenses and they do not reverse; they represent a structural upward pressure on rates that is independent of fuel prices and independent of how much electricity anyone uses.
There is a third, quieter pressure: the long-running question of what replaces aging coal capacity in a state whose transmission connections to larger western markets are limited. Montana generates more electricity than it consumes and exports the surplus, which means the state's rate is entangled with regional market conditions and with the physical capacity of the lines running out of it.
None of this is controllable by a household. It is worth understanding anyway, because it explains why a Montana bill can rise in a year when your own usage fell, and why the answer is rarely anything you did.
Frequently asked questions
Why is Montana's electric bill below average when the winters are so cold?
Because most Montana heating energy is not electricity. Natural gas serves the main population centers, and propane, fuel oil, and wood cover much of the rest, so the coldest months load up a different bill entirely. Meanwhile the cooling season is short, dry, and often handled without central air conditioning at all. The result is average consumption of 852 kWh a month, marginally below the national 863, at a rate of 14.67 cents. A low electric bill in Montana usually means the household's real winter energy cost is showing up somewhere else.
Can I choose my electricity supplier in Montana?
No, not as a residential customer. Montana opened its market to retail choice in the late 1990s, the experiment failed, and choice was repealed for residential customers in 2007. Only certain large commercial and industrial customers retain the ability to shop. Households take bundled service from their regulated utility or their cooperative at a rate set by the Public Service Commission or by the co-op's elected board. There is no competitive supply offer available to a Montana household, and any pitch claiming otherwise is not describing a legitimate product.
What is a normal winter electric bill in Montana?
There is no single answer, because it depends almost entirely on how the house is heated. A gas-heated home sees a fairly flat electric bill year-round, with winter increases driven mainly by lighting, the furnace blower, and longer indoor hours. A home on electric baseboard or a heat pump with resistance backup can see January and February bills three or more times its summer ones. If you heat with electricity, benchmark against your own house in the same month a year earlier rather than against the state average, which blends two incompatible patterns.
Why do co-op members in Montana sometimes pay less than NorthWestern customers?
Largely because of where the wholesale power comes from. Many Montana electric cooperatives purchase federal hydropower at preference rates, a structural cost advantage that investor-owned utilities cannot access. Co-ops are also non-profit and return margins to members rather than paying shareholder returns. Against that, co-ops serve very sparse territory with high line-miles per customer, which raises delivery costs. The net result varies by co-op. The important point when comparing bills is that a cooperative and an investor-owned utility are different kinds of organisation with different cost structures and different regulators.
Does snowpack really affect my electricity rate?
Indirectly, yes. Hydroelectric generation is a significant part of Montana's supply, and hydro output depends on runoff from winter snowpack. A weak snow year means less of the cheapest power on the system, so utilities buy replacement energy on the wholesale market or run thermal plants instead, at higher cost. Those costs are eventually recovered from customers through fuel and purchased-power mechanisms and rate cases. The effect arrives on a lag of months or longer, which is why a rate increase rarely lines up neatly with the weather that caused it.