NorthWestern Energy Group Inc. filed a Large New Load Tariff proposal with the Montana Public Service Commission on April 1 2026. The tariff would establish requirements and contract terms for bundled customers with new or expanded loads of 5 megawatts or more, creating a structured rate schedule that protects existing customers from cost shifting while enabling the company to serve large industrial loads, including data‑center developers.
The filing comes as NWE anticipates significant data‑center demand. The company is in talks with at least three potential data‑center customers that could scale to 2,250 MW by 2030. By codifying the tariff, NWE ensures that new customers bear the associated costs, thereby preventing ratepayer burden and fostering a predictable environment for large‑scale energy use.
Financially, NWE’s Q1 2025 results showed diluted GAAP EPS of $1.25 versus $1.06 in Q1 2024, and non‑GAAP EPS of $1.22 versus $1.09. For the full year 2025, GAAP diluted EPS was $2.94 compared with $3.65 in 2024, and non‑GAAP diluted EPS was $3.58 versus $3.40. These figures reflect higher rates, increased volumes, and transmission revenues, offset by mild weather headwinds and merger‑related costs.
Strategically, the tariff aligns with NWE’s broader growth plan, which includes a $3.2 billion capital investment program for 2025‑2029 to upgrade infrastructure and support new industrial customers. The filing also precedes the company’s planned merger with Black Hills Corporation, expected in late 2026, which will strengthen its financial position for grid expansion.
Regulatory and stakeholder context underscores the proposal’s importance. The Montana PSC and advocacy groups view the tariff as a mechanism to protect ratepayers from cost shifting. President & CEO Brian Bird said the proposal reflects “Montana values—fairness, accountability, and thoughtful growth.” The company also highlighted House Bill 490, which limits wildfire‑related risks, providing additional certainty for future investments.
By establishing a clear regulatory framework for large new loads, NWE positions itself to capture growth in the data‑center sector while safeguarding existing customers, reinforcing its commitment to responsible expansion in Montana’s evolving energy market.
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