NorthWestern Energy Proposes New Tariff for Large Power Users

NorthWestern Energy proposes a tariff to charge large power users for infrastructure costs.

The utility has submitted a Large New Load Tariff rule to the Montana Public Service Commission to require new, high-demand customers—such as data centers—to pay for the infrastructure upgrades their power use necessitates. This move aims to prevent increased utility rates for existing customers by ensuring new large power consumers cover their own costs.

The tariff would apply to customers needing 5 megawatts or more, a threshold that includes data centers consuming power comparable to a city the size of Missoula. Some data centers, like the one proposed near Bonner, may even build their own generation capacity, as exemplified by Elon Musk’s X AI. The City of Missoula has filed an intervention to participate in the regulatory process, emphasizing the need for oversight and fair cost allocation. Municipal officials stress that the rule should conform to best practices, ensuring that infrastructure costs are not passed on to other ratepayers.

The proposal remains early in development, with discussions and possible implementation still months or years away.

While Montana’s energy landscape has traditionally focused on agriculture and resource extraction, the growth of data centers could shift demand patterns. This tariff proposal might influence how Montana communities balance new industrial power needs against protecting existing ratepayers, particularly in areas like Missoula where infrastructure costs could otherwise escalate.

NorthWestern Energy proposes large load tariff for data centers to the Montana Public Service Commission
By Zach Volheim, KTVH