Rainbow (MT)
BrownfieldGreat Falls, Cascade, Montana · NorthWestern Energy (MT Hydro)
Rainbow (MT) is a former hydro site in Great Falls, Cascade, Montana, retired 2013-04-01. Retired generation sites are among the most attractive datacenter redevelopment targets: the existing interconnection was sized for roughly 37 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
Site conditions & market — Cascade County
County-level intelligence for this site's location — the power economics, water, hazard, connectivity, and workforce a developer screens before ever visiting. Assembled from FEMA NRI, BLS QCEW, FCC BDC, USGS water-use, and EIA.
Market & workforce
Power economics & interconnection
Water & cooling
Hazard, flood & connectivity
County-level context — address-level utility offerings and flood zoning vary within the county. Confirm site-specific service with the utility and a Phase I ESA.
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Nearby datacenter candidate sites
Scored candidate sites near Rainbow (MT), ranked by DC Readiness.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| GREAT FALLS (RAINBOW) | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 62.5 |
| UNKNOWN206326 | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 62.4 |
| GREAT FALLS (RAINBOW) | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 62.2 |
| UNKNOWN206325 | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 62.1 |
| DUTTON PUMP | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 61.5 |
| TAP206227 | Substation-Adjacent | MT | Cascade County | 138 kV | 100 MW | 3.3 yrs | 58.4 |
| UNKNOWN206569 | Substation-Adjacent | MT | Cascade County | 115 kV | 100 MW | 3.3 yrs | 58.2 |
| UNKNOWN204148 | Substation-Adjacent | MT | Cascade County | 115 kV | 100 MW | 3.3 yrs | 58.1 |
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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.
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