
NorthWestern Energy Boosts Colstrip Plant Ownership to 55%

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NorthWestern Energy Group Inc. plans to increase its ownership in Montana's Colstrip Plant from 15% to 55% by acquiring shares from Avista and Puget Sound Energy. This move aims to enhance energy reliability and support future demand in Montana. The transaction involves no purchase price for the added capacity. The information was originally published by NorthWestern Energy on December 5, 2025, and is for informational purposes only.
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