NorthWestern Energy Enters into Strategic Agreement to Secure Reliable, Cost Effective Energy Service for Montana

NorthWestern Energy and Avista announce an agreement to provide NorthWestern Energy’s Montana customers needed on-demand power generation capacity and allow Avista to exit ownership of the Colstrip plant in accordance with the state of Washington laws.

NorthWestern Energy will acquire Avista’s ownership of Colstrip Units 3 & 4, 222 megawatts, with no purchase price, effective on Jan. 1, 2026.

Avista will retain its obligation for its portion of environmental and decommissioning costs associated with the future closure of the plant.NorthWestern Energy will be responsible for operational costs f...