Black Hills-NorthWestern Merger Could Reshape Western Market Map
Too Soon to Determine Impact on Competition Between CAISO’s EDAM and SPP’s Markets+
NorthWestern's balancing authority area (in blue) is bordered by BPA and Avista to the West, WAPA to the east, and PacifiCorp-East to the south. | NorthWestern Energy
Aug 19, 2025
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The proposed merger between Black Hills Corp. and NorthWestern Energy likely will reshape the map in the competition between CAISO’s Extended Day-Ahead Market and SPP’s Markets+ — but it’s still too early to know where new boundaries will be drawn.
