BHE Montana, Black Hills Energy Begin Trading in CAISO’s WEIM
Expansion Extends Market to Include Slice of South Dakota, Link to Alberta

BHE Montana and two subsidiaries of Black Hills Energy have become the new participants in CAISO’s Western Energy Imbalance Market. | CAISO
May 6, 2026
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CAISO’s Western Energy Imbalance Market expanded its geographic reach deeper into the interior West as BHE Montana and two subsidiaries of Black Hills Energy began trading in the real-time market.

