NorthWestern Energy to Seek New Capacity Resources in South Dakota, Explore Expedited Electric Grid Interconnection Process

SIOUX FALLS, S.D.–(BUSINESS WIRE)–NorthWestern Energy Public Service Corporation d/b/a NorthWestern Energy Group will issue an all-source capacity request for proposals (RFP) on Aug. 15, 2025, for its South Dakota electric system. The capacity resource RFP is focused on improving reliability by securing additional capacity through a competitive market solicitation. NorthWestern Energy is also exploring opportunities to participate in the Southwest Power Pool Expedited Resource Adequacy Study, a one-time accelerated study of generation projects needed to address resource adequacy and reliability needs in the SPP footprint.

NorthWestern Energy provides reliable electric supply to its South Dakota customers through owned generation assets, power purchase agreements, and market purchases. NorthWestern Energy is experiencing load growth along with increased capacity needs and is seeking additional safe and reliable capacity resources in this RFP.

The RFP will be administered by Aion Energy LLC, and all inquiries from potential respondents must be directed to NWPS-2025@aionenergyllc.com.

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NorthWestern Energy – Delivering a Bright Future

NorthWestern Energy Group, Inc. (Nasdaq: NWE), doing business as NorthWestern Energy, provides essential energy infrastructure and valuable services that enrich lives and empower communities while serving as long-term partners to our customers and communities. We work to deliver safe, reliable, and innovative energy solutions that create value for customers, communities, employees, and investors. We do this by providing low-cost and reliable service performed by highly-adaptable and skilled employees. We provide electricity and / or natural gas to approximately 842,100 customers in Montana, South Dakota, Nebraska, and Yellowstone National Park. Our operations in Montana and Yellowstone National Park are conducted through our subsidiary, NW Corp, and our operations in South Dakota and Nebraska are conducted through our subsidiary, NWE Public Service. We have provided service in South Dakota and Nebraska since 1923 and in Montana since 2002.

Contacts

Media Contact:
Jo Dee Black

(866) 622-8081

jodee.black@northwestern.com