New large loads served from transmission or substation infrastructure are covered today by NorthWestern Energy's existing Schedule GSEDS-2 for customers served directly from a transmission line or qualifying substation, and, pending before the Montana Public Service Commission since March 2026, a proposed dedicated Large New Load Tariff.
Also active in Montana: Montana is already hosting a 1,000 MW Quantica Infrastructure data centre project (500 MW in an initial phase beginning as early as 2026) and a 150 MW Atlas Power Group project in Butte.
Named Projects Already Underway
| Customer | Location | Details |
|---|---|---|
| Quantica Infrastructure | Montana | 1,000 MW data centre project; initial 500 MW phase to begin as early as 2026, full expansion by 2030 |
| Atlas Power Group | Butte, MT | 150 MW data centre project, with 75 MW available in 2026 |
Figures compiled from the Edison Electric Institute's "Large Load Projects and Tariffs" (September 2026) member-company summary and public regulatory filings. Confirm current tariff terms directly with NorthWestern Energy and the relevant state public utility commission before relying on any figure for a capital decision.
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Model This State on Your Own Site
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