- Adams Countysame day
- Arapahoe County40.5 business days
- Arvada7 business days
- Aurora3.5 business days
- Boulder5.5 business days
- Boulder County5 business days
- Brighton8 business days
- Broomfield city & County19 business days
- Castle Pines6 business days
- Castle Rock6.5 business days
- Centennial9 business days
- Commerce City3 business days
- Denver city & Countysame day
- Douglas County7 business days
- Englewood9.5 business days
- Erie13.5 business days
- Evans4 business days
- Firestone26 business days
- Fort Collins7.5 business days
- Frederick20 business days
- Golden10 business days
- Greeley0.5 business days
- Jefferson Countysame day
- Johnstown10 business days
- Lafayette6 business days
- Lakewood5.5 business days
- Littleton3 business days
- Lochbuie5 business days
- Longmont4.5 business days
- Louisville16 business days
- Milliken6.5 business days
- Northglenn4.5 business days
- Parker9 business days
- Superior25 business days
- Thornton7 business days
- Weld County21 business days
- Westminster1 business day
- Wheat Ridge2 business days
- Windsor11 business days
Colorado utility interconnection
| Utility | Approval before install | Apply via | Fee | Utility response | System size cap | Capacity map |
|---|---|---|---|---|---|---|
| City of Colorado Springs - (CO) | Required | No fee | 10 days (required by rule) | 120% of annual usage | Not on record | |
| City of Fort Collins - (CO) | Required | No fee | 10 days (required by rule) | 120% of annual usage | Hosting capacity map | |
| City of Longmont | Required | Portal | Online payment | 10 days (required by rule) | 120% of annual usage | Not on record |
| Intermountain Rural Elec Assn (IREA) / CORE | Required | No fee | 10 days (required by rule) | 120% of annual usage | Not on record | |
| Mountain View Elec Assn, Inc (MVEA) | Required | Online payment | 10 days (required by rule) | No size cap on record | Not on record | |
| Poudre Valley REA, Inc (PVREA) | Required | No online payment | 10 days (required by rule) | 120% of annual usage | Not on record | |
| Public Service Co of Colorado (XCEL Energy) | Required | Portal | No online payment | 10 days (required by rule) | 120% of annual usage | Hosting capacity map |
| United Power, Inc | Required | — | 10 days (required by rule) | 120% of annual usage | Not on record |
Source: SolarTRACE, National Renewable Energy Laboratory (NREL), 2025-09-09 release. Times are medians for residential solar in the year shown. Requirements change — confirm current rules, fees and forms with the jurisdiction before you submit.