US utilities NorthWestern Energy and NV Energy seek tariffs to cover data center power demand

NorthWestern Energy has filed a Large New Load Tariff proposal with the Montana Public Service Commission that would apply to new customers drawing 5 megawatts or more – essentially targeting data centers. The rule would require large‑load customers to pay up‑front for infrastructure upgrades and surcharges so existing ratepayers are not burdened. Missoula city and county officials have intervened to ensure local interests are represented in the rule‑making process.

In Nevada, NV Energy’s Integrated Resource Plan projects data centers will grow from 5 percent of electricity sales today to 64 percent by 2046. To meet that demand the utility is seeking $3.2 billion for transmission and substation upgrades and thousands of megawatts of new solar, battery, geothermal and gas generation. NV Energy says the plan will require large users to fund or support the infrastructure needed for their load, protecting existing customers from cost shifts. The utility emphasized, “We are required to plan for and serve customers who choose to locate in our service territory.” Both utilities are proactively addressing the rapid expansion of data center electricity use.