electricians

Generator Installation for Wyoming Power Outages: Altitude, Wind, and What It Costs

Installing a backup generator in Wyoming: altitude derating by town, sizing for wells and furnaces, propane vs diesel, wind placement, state permits, and 2026 costs.

Generator Installation for Wyoming Power Outages: Altitude, Wind, and What It Costs

Wyoming loses power for reasons other states rarely deal with. Wind gusts past 70 miles per hour along I-80 between Cheyenne and Rawlins take down lines and trigger utility shutoffs, wildfire season brings preventive outages in the Bighorns and the Snowy Range, and long rural distribution lines serving ranches outside Gillette, Riverton, and Pinedale can take days to repair when a storm hits at the far end.

A generator that starts on its own and runs the furnace, the well, and the lights is a practical purchase across most of the state.

Installing one here is not the same as installing one in Denver or Omaha, though. Elevation cuts generator output, wind changes where the unit can sit, and fuel logistics on a ranch are different from those on a city lot. This guide walks through the process a licensed electrician will follow, the choices that matter in Wyoming, and what the finished job costs in 2026.

Elevation Cuts Output, and Most of Wyoming Is High

Every combustion generator loses power as it climbs. The rule of thumb from manufacturers is a loss of about 3 percent of rated output for every 1,000 feet above the first 1,000 to 3,000 feet, depending on the engine, because thinner air means less oxygen for combustion. At sea level a 22 kilowatt standby unit delivers 22 kilowatts, and at 7,200 feet in Laramie it may deliver 17 or 18.

That derating is the single most common sizing mistake in the state. A unit that looks right on the spec sheet comes up short when the well pump starts at the same time the furnace blower kicks on, and the generator trips on overload in the middle of a January outage. The table below shows approximate elevation and the resulting output for a nominal 22 kilowatt air-cooled unit in Wyoming's larger towns.

Some manufacturers offer high-altitude kits that adjust the fuel mixture and recover part of the loss, and propane units tend to derate less than gasoline. The practical fix is to size one step up. If the load calculation says 18 kilowatts, buy the 22 or the 24, and if it says 22, look at 26.

Sizing for a Wyoming Winter Load

The furnace is the first load. Gas and propane furnaces draw 600 to 1,200 watts for the blower and controls, and boilers even less, so the heating system itself is a modest load in most Wyoming homes. Electric baseboard and heat pumps with electric backup are the exception and push the requirement into whole-house territory.

Well pumps are the load that matters on ranches and in the subdivisions outside every Wyoming town. A one-horsepower submersible draws about 2,000 watts running and needs 6,000 or more to start, and deep wells in the Laramie basin and around Casper sometimes run larger pumps. Stock tank heaters, a shop with a compressor, and a barn with lights and a heated waterer add up fast.

A typical Cheyenne or Casper home on natural gas with city water lands at 10 to 14 kilowatts of real load for the circuits that matter in an outage. A ranch outside Sheridan with a well, a shop, and stock heaters often needs 20 to 30 kilowatts. A licensed electrician will run a load calculation as part of the quote, and after applying the altitude derating it decides the unit size.

Fuel Logistics Across the State

Natural gas is available in Cheyenne, Casper, Laramie, Gillette, Rock Springs, Sheridan, and most of the larger towns through Black Hills Energy, Dominion Energy, and Montana-Dakota Utilities. Where it exists, a natural gas standby unit is the simplest choice because it runs indefinitely without fuel storage. The gas line from the meter to the generator is part of the installation and typically adds $500 to $1,500.

Propane is the fuel for everything outside those service areas, which covers a large share of the state's land and a good share of its homes. Propane tanks lose vaporization capacity in extreme cold, and at -20 a small or half-empty tank cannot supply a 22 kilowatt generator under load. Installers in Wyoming generally recommend a 500-gallon tank or larger for a standby unit and a delivery schedule that keeps it above half through winter.

Diesel standby units are common on larger ranches and for homes far from any propane delivery route, because diesel stores well in cold weather with the right additives and a single tank can cover weeks of runtime. Diesel units cost more up front, $12,000 to $25,000 for the generator alone in the 20 to 40 kilowatt range, but they are the most reliable option for a place that is 60 miles from the nearest town.

Wind, Placement, and Weatherproofing

A standby generator's enclosure is designed for weather, but a sustained 60 mile-per-hour wind carrying snow will pack the intake louvers and can affect combustion. Installers in Cheyenne and Laramie place units on the lee side of the house, often the east or south wall, with the exhaust pointed away from the prevailing westerly wind. Manufacturers require set clearances from walls, windows, and doors, and those clearances still apply.

The pad matters in wind country too. A composite pad works on a sheltered city lot, and a poured concrete pad anchored to the ground is the better choice on an exposed site. Snow drifting is the other placement issue, and a unit that drifts in every storm is a unit that gets buried when it is needed.

Portable generators have their own placement rule with no exceptions: never in a garage, a shed, a lean-to, or near an open window. Carbon monoxide deaths during outages happen every winter, and Wyoming's wind makes people want to shelter the generator. A proper outdoor inlet with a 25-foot cord solves the problem.

The Installation Process and Licensing

A standby installation starts with a site visit and load calculation, followed by a quote that lists the generator model, the automatic transfer switch, the gas or propane piping, the pad, the electrical run, and the permits. The electrician sets the pad, mounts the unit, installs the transfer switch at the main panel, runs conduit and gas line, and coordinates with the propane supplier or gas utility. A typical job takes one to two days on site.

Wyoming licenses electricians statewide through the Department of Fire Prevention and Electrical Safety, and a state electrical permit and inspection are required for transfer switch and standby work even in counties with no local building department. Cities such as Cheyenne, Casper, and Laramie have their own permit processes on top of the state's. The gas piping needs a licensed installer as well, and the utility has to be notified of any automatic transfer switch to protect line crews from backfeed.

A quote that does not mention the state permit, the transfer switch model, and the altitude derating is missing something. Homeowners across the state have written up their own generator projects and what they paid, and the guides on our blog collect those accounts alongside other local service costs. The licensed electricians listed on this site are grouped by town, and the ones in Cheyenne, Casper, Gillette, and Sheridan handle standby installations regularly.

What It Costs in 2026

A portable generator with a code-compliant outdoor inlet and a panel interlock costs $500 to $1,200 for the electrical work plus $1,000 to $2,500 for the generator, and it is the right answer for many town homes on natural gas heat. A manual transfer switch with eight to ten circuits runs $900 to $2,000 installed.

A 22 to 24 kilowatt air-cooled standby unit on natural gas in Cheyenne or Casper typically totals $10,000 to $15,000 installed, including the transfer switch, gas line, pad, cold weather kit, and permits. The same unit on propane at a ranch outside Laramie or Pinedale often lands at $12,000 to $18,000 once a larger tank, a longer gas line, and a trenched electrical run are added. Liquid-cooled units of 30 kilowatts and up, common on working ranches, run $20,000 to $35,000 installed.

Cold weather kits with a battery warmer and oil heater add $150 to $400 and should be on every quote in the state. Annual service runs $200 to $400. Wyoming's sales tax applies to the equipment and, in most counties, to the labor, so budget 4 to 6 percent on top of the quote.

Frequently Asked Questions

How much does elevation reduce a generator's output in Wyoming?

Roughly 3 percent per 1,000 feet above the engine's rated altitude, which means a 22 kilowatt unit delivers about 17 to 19 kilowatts across most of the state. Size one step larger than the load calculation suggests.

Do I need a permit to install a generator in Wyoming?

Yes. The state requires an electrical permit and inspection through the Department of Fire Prevention and Electrical Safety for transfer switch and standby installations, and cities add their own permits. The electrician should handle both.

Is propane or diesel better for a ranch generator?

Propane is simpler and cleaner for homes within a delivery route, provided the tank is 500 gallons or larger. Diesel is the better choice for remote ranches and large loads, because it stores well in cold weather and a single tank covers weeks of runtime.

Can a standby generator handle Wyoming wind?

Yes, when it is placed on the lee side of the house with the exhaust facing away from the prevailing wind and mounted on an anchored pad. Units on exposed west-facing sites collect drifting snow and are harder to keep running.