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EnergyAnnouncement

NorthWestern lists Atlas Power large-load study of 75 MW ramping to 150 MW in Montana, targeting late 2027

The opportunity was announced December 19, 2024 and is under a Development Agreement. Targeted start date is late 2027.

Size
150 MW
Place
Montana
Companies
Atlas Power, NorthWestern
Source
NorthWestern Energy Group, Inc. 8-K, filed Nov 6, 2026
Published here

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Energy Filing

NorthWestern filed a Large New Load tariff rule with the MPSC covering new loads of five megawatts or greater, including data centers

5 MW

Filed in March 2026, the rule requires executed Electric Service Agreements for commitments of 50 megawatts or greater to go to the MPSC for approval before service begins. Loads of 5 to 49 megawatts follow standardized processes without case-specific approval, and the MPSC has not set settlement or hearing dates.

NorthWestern Energy Group Source: NorthWestern Energy Group, Inc. 8-K, filed Nov 5, 2026

Energy Financial disclosure

NorthWestern's remaining Montana data center development agreements expect 75 megawatts from late 2027, growing to about 1,250 megawatts or more by 2030

1,250 MW

NorthWestern has development agreements with Atlas Power Holdings LLC and Quantica Infrastructure to supply power to data centers in Montana. The Sabey Data Centers development agreement has been terminated, and the company is working to execute electric service agreements.

Atlas Power Holdings LLCNorthWestern Energy GroupQuantica InfrastructureSabey Data Centers Source: NorthWestern Energy Group, Inc. 8-K, filed Nov 5, 2026