NorthWestern Energy files data center tariff proposal

By: Keila Szpaller

Outlets: Daily Montanan

Published: April 2, 2026

Words: 847

Last Updated: 4 months ago

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NorthWestern Energy announced it filed an application requesting approval of its terms for serving data centers — a “Large New Load Tariff.”

The utility filed the application this week with the Montana Public Service Commission, which has been anticipating the proposal.

In an email, PSC spokesperson Jamey Petersen said the Commission has already indicated that under state law, a utility can’t serve a large load customer, such as a data center, “before a determination by …

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