What Is the Average Cost to Install a Whole Home Generator?

The average cost to install a whole home generator is not a single set price; Tri-State Water, Power and Air confirms your total after a free on-site evaluation and sizing. The biggest drivers are how much power your home needs and how complex it is to connect fuel and electrical systems. We offer Generac and KOHLER options with turnkey installation that can be completed in 1 day on many systems, and financing is available. Our team regularly installs and services systems throughout the Riverton area. A right-sized unit that covers starting watts often costs less to own than an oversized model.

Key factors that change total price:

• Generator capacity (kW) and whole-home vs essential-circuits coverage
• Fuel type and required gas line length/pressure work
• Transfer switch type and any load-management needs
• Electrical upgrades, panel work, and site prep (pad and placement)

Schedule a sizing visit to lock in an accurate quote before you decide. <br/> Updated: 2026-05-27 <br/> Need help in Riverton, KS? Call (816) 919-1800 or book online. "The crew did excellent work installing our generator and were very professional." — Marlene C.