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Generator Installation · Colorado
A generator must connect through a transfer switch or an approved interlock so it can never feed power back into utility lines. Electricians install standby generators, portable generator inlets with interlocks, and the transfer equipment for both.
Hail and lightning on the Front Range, heavy snow in the mountains and a fast-growing EV fleet shape most electrical calls.
Across the Mountain West, homes deal with dry air, large temperature swings, wildfire seasons and heavy snow at elevation. Permit offices, utilities and housing stock differ by city, which affects how generator installation is planned and scheduled. These local guides cover the Colorado cities where we have written specific notes.
Denver's heavy spring snowstorms and summer windstorms can bring down trees and lines, and Xcel Energy has also used public safety power shutoffs during extreme wind and fire risk along the Front Range, including in April 2024. Many homeowners want backup for the furnace, refrigerator and sump pump.
Utility: Xcel Energy
Aurora's spring snowstorms, summer windstorms and occasional public safety power shutoffs along the Front Range can cause outages, and in winter a furnace without power becomes a problem. Many homeowners want backup for the furnace, sump pump and refrigerator.
Utility: Xcel Energy
Xcel Energy has used public safety power shutoffs in Boulder during extreme wind and fire risk, and the December 2021 Marshall Fire showed how quickly wind-driven fire can spread. Many Boulder homeowners now want backup power, and with rooftop solar common, a battery system is often the first choice because it runs quietly and needs no fuel.
Utility: Xcel Energy
1. Size the load
Circuits that must stay powered are listed and the generator sized.
2. Choose the connection
Inlet and interlock, manual transfer switch or automatic transfer switch.
3. Install and inspect
Permitted installation, gas connection by a licensed fitter where needed, and inspection.
Electricians set their own prices; local permit fees and utility requirements add to these factors.
Permits come from the city or county where the home is. For example: Denver: Electrical permits in Denver are issued by Community Planning and Development; surrounding cities have their own building departments. Aurora: Electrical permits inside city limits come from the City of Aurora's building division; parts of Aurora lie in Adams and Douglas counties. Boulder: Electrical permits come from the City of Boulder's Planning and Development Services; Boulder County handles unincorporated areas.
Denver: Xcel Energy. Aurora: Xcel Energy. Boulder: Xcel Energy.
Listed interlock kits are accepted in many jurisdictions when installed with a permit. Your electrician will know the local rule.
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