PowerPlantFactsEvidence report · prepared 2 September 2026https://powerplantfacts.com/entity/6422
EIA plant 6422
Ennis · Madison · MT
Madison Dam
Operated by NorthWestern Energy (MT Hydro)
Published location
Where is Madison Dam?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
45.487869, -111.633807
Open the interactive map ↗Map data © OpenStreetMap contributors
Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 3,956 MWh |
| 2 | 6,162 MWh |
| 3 | 6,628 MWh |
| 4 | 6,235 MWh |
| 5 | 7,753 MWh |
| 6 | 7,501 MWh |
| 7 | 6,842 MWh |
| 8 | 6,563 MWh |
| 9 | 5,884 MWh |
| 10 | 6,282 MWh |
| 11 | 5,542 MWh |
| 12 | 6,861 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| MAD5 | Conventional Hydroelectric | WAT | 4.1 | OP |
| MAD6 | Conventional Hydroelectric | WAT | 4.1 | OP |
| MAD7 | Conventional Hydroelectric | WAT | 4.1 | OP |
| MAD8 | Conventional Hydroelectric | WAT | 4.1 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
6422
Sector
Electric Utility
Water source
Madison River
Data edition
2024-final