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
Nearby datacenter candidate sites
Scored candidate sites near Rainbow (MT), ranked by DC Readiness.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| UNKNOWN206326 | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 59.3 |
| DUTTON PUMP | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 59.3 |
| GREAT FALLS (RAINBOW) | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 59.3 |
| UNKNOWN206325 | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 59.3 |
| GREAT FALLS (RAINBOW) | Substation-Adjacent | MT | Cascade County | 230 kV | 300 MW | 3.3 yrs | 58.5 |
| TAP208219 | Substation-Adjacent | MT | Chouteau County | 69 kV | 50 MW | 3.3 yrs | 55.4 |
| TAP206227 | Substation-Adjacent | MT | Cascade County | 138 kV | 100 MW | 3.3 yrs | 55.3 |
| UNKNOWN205592 | Substation-Adjacent | MT | Cascade County | 115 kV | 100 MW | 3.3 yrs | 54.9 |
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 Rainbow (MT), Great Falls, Cascade, 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.