10 kW Whole House Generator Cost $5,000 to $8,000 Installed in 2026.

What 10 kW Actually Powers

Ten kilowatts is 10,000 watts of continuous running power, with a typical surge capacity around 12,000 to 13,000 watts for two to three seconds. That second number matters because almost every motor in a home (well pump, sump pump, refrigerator compressor, central AC compressor, deep freezer) draws three to seven times its running wattage for the first half second of startup. A 10 kW generator with 13 kW of surge will start one mid-size compressor at a time, not two.

In practical terms, here is what runs comfortably on a 10 kW unit during a power outage: a gas furnace blower (typically 800 to 1,200 running watts), a refrigerator and a separate freezer (combined 1,000 to 1,400 running watts including duty cycle), a well pump or sump pump (running 750 to 1,500 watts depending on horsepower), every interior light circuit in the house (LED lighting on a typical 2,000 square foot home runs 200 to 500 watts at maximum), the television, the modem, the router, and enough outlet capacity to keep two laptops, three phones, and a couple of small appliances going.

What does not run on a 10 kW unit simultaneously with all of the above: any central air conditioner above one ton, any electric water heater drawing 4,500 watts, any electric range element, any electric dryer at 5,500 watts, any tankless electric water heater at 18,000 watts, any electric vehicle charger at 7,200 watts continuous. You can run any one of those, but you cannot run them with the heat, the fridge, and the lights at the same time. The math runs out.

This is the honest framing of a 10 kW system. It is partial coverage. The marketing language from some installers ("whole house") is technically true if the house has no central AC and no major electric appliances, but the typical American home built after 1990 has central air and at least one of the big-three electric loads, so partial-coverage is the more accurate label.

Why Installation Adds $2,200 to $3,800 on a 10 kW Job

The 10 kW unit ships from the factory as a sealed enclosure with the engine, alternator, controller, and circuit boards inside. Everything that makes it a working backup system has to be added on site, and that work is broadly the same for a 10 kW job as for a 22 kW job. The labour does not scale down linearly with capacity, which is why the 10 kW installed price is not half of the 22 kW installed price.

The automatic transfer switch is the second-largest line item. A 100 amp ATS is sufficient for a 10 kW system feeding essential circuits, costing $400 to $700 for the switch itself and a further $400 to $700 in electrical labour to wire it between the meter and the panel. A service-entrance-rated 200 amp switch (used when the install is being futureproofed for a later upgrade to a larger generator) costs $700 to $1,200 plus labour. The 200 amp switch is the more common spec because electricians prefer to do the panel work once.

The concrete pad runs $300 to $700 for a 4-inch poured pad approximately 36 by 24 inches. Composite polyethylene pads are acceptable in some jurisdictions for units of 22 kW or smaller and cost $150 to $300 installed, but they are not universally accepted by inspectors. If the site requires excavation or grading to reach pad-ready ground, add $200 to $500.

The gas line connection is where 10 kW jobs sometimes save money relative to 22 kW. A 10 kW generator running on natural gas demands roughly 140,000 BTU per hour at full load, which a three quarter inch existing service line will usually carry over a short run. A 22 kW unit needs around 315,000 BTU per hour and almost always requires a one inch or larger dedicated run, which is what drives gas-line cost to $1,200 to $2,000 on the larger jobs. For a 10 kW project, expect $300 to $900 for the gas-line tap and short run from the meter.

Permits, inspection fees, and the electrical wiring of the transfer switch into the home panel cover the remainder. Permit cost varies widely (Florida hurricane counties charge more than rural Pennsylvania, for example) but $100 to $400 is typical. Electrical labour for the panel interlock, conduit run, and final test fire is another $400 to $900. Add the dealer commissioning fee of $150 to $300 (factory-authorized dealers must commission the unit for the warranty to take effect) and the install line items total around $2,200 to $3,800.

Fuel and Running Cost on a 10 kW Unit

A 10 kW generator at full load on natural gas consumes approximately 140 cubic feet per hour, or roughly 1.4 therms per hour. At the May 2026 EIA national average residential natural gas price of about $1.10 per therm, that works out to roughly $1.50 per hour at full load and closer to $0.80 per hour at the more typical 50 percent load during an outage. EIA residential natural gas price series publishes the underlying rate by state.

On propane the running cost is roughly two to three times higher. A 10 kW unit at full load burns about 1.8 gallons of propane per hour and around 1.0 gallons per hour at 50 percent load. At the May 2026 EIA national average residential propane price near $2.85 per gallon, that is $5.10 per hour at full load and $2.85 per hour at half load. A 500 gallon residential propane tank holds about 400 gallons usable, which translates to roughly 200 to 400 hours of generator runtime depending on average load. Most propane-fuelled standby installations are sized with a 500 or 1,000 gallon tank for this reason. EIA residential propane price series publishes the weekly average.

The practical takeaway: natural gas is the right fuel pick if a utility gas line reaches the property. Propane is the right pick when natural gas is unavailable (rural and many semi-rural properties) and the homeowner accepts the higher running cost in exchange for the standby capability. Diesel is virtually unused at the 10 kW residential tier; it is overkill for the load size and the fuel storage logistics do not pencil out.

Compare with adjacent tiers