A whole home generator in Colorado typically costs between $8,500 and $18,000 installed, depending on the size of your home, the brand, and whether a panel upgrade or gas line extension is required. A 22kW Generac — the most common size for a 2,000–3,000 sq ft home — runs approximately $10,000–$13,000 fully installed with permits. Larger homes or those needing electrical panel work will fall toward the higher end. That price includes the generator unit, transfer switch, wiring, concrete pad, permits, and inspection. Xcel Energy customers may qualify for rebates that reduce the net cost further. The Electricians provides free in-home quotes with upfront pricing — no surprises on installation day.