Madison Dam
BrownfieldEnnis, Madison, Montana · NorthWestern Energy (MT Hydro)
Madison Dam is a former hydro site in Ennis, Madison, Montana, retired 2019-10-01. Retired generation sites are among the most attractive datacenter redevelopment targets: the existing interconnection was sized for roughly 9 MW of generation, so the grid hookup, transmission rights, and often cooling-water access are already in place — collapsing the speed-to-power timeline versus a greenfield build.
Former use & capacity
Grid hookup & remediation
Nearby datacenter candidate sites
Scored candidate sites near Madison Dam, ranked by DC Readiness.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| DEADHEAD | Substation-Adjacent | MT | Gallatin County | 115 kV | 100 MW | 1.1 yrs | 72.2 |
| UNKNOWN202686 | Substation-Adjacent | MT | Jefferson County | 115 kV | 100 MW | 1.1 yrs | 68.4 |
| Greenfield (THREE RIVERS - UNKNOWN202222) | Greenfield | MT | Gallatin County | 115 kV | 100 MW | 1.1 yrs | 67.5 |
| UNKNOWN202297 | Substation-Adjacent | MT | Madison County | 115 kV | 100 MW | 1.1 yrs | 67.3 |
| UNKNOWN205083 | Substation-Adjacent | MT | Gallatin County | 115 kV | 100 MW | 1.1 yrs | 67.2 |
| UNKNOWN202306 | Substation-Adjacent | MT | Madison County | 115 kV | 100 MW | 1.1 yrs | 65.9 |
| TAP207391 | Substation-Adjacent | MT | Gallatin County | 115 kV | 100 MW | 1.1 yrs | 65.4 |
| Greenfield (THREE RIVERS - MILL CREEK GENE) | Greenfield | MT | Jefferson County | 230 kV | 300 MW | 1.1 yrs | 64.8 |
Nearby internet exchanges
- Montana OpticomBozeman, MT · 1 networks
- JSLLC BozemanBozeman, MT · 0 networks
See all datacenter sites in Montana →
Dataset updated . Screening estimates derived from public data sources.
Brownfield attributes are derived from EIA retired-generator and EPA public data. Existing capacity reflects the retired plant's historical nameplate, not deliverable interconnection for a new load. Confirm reusable interconnection rights, remediation status, and site availability with the utility, ISO, and current owner.
Go deeper than the public screen
This page shows a public slice of the GridCensus dataset for Madison Dam, Ennis, Madison, Montana. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.