Empowering Montana: NorthWestern Energy’s expanded role at the Colstrip Power Plant

Other Colstrip Power Plant owners are leaving because wind and solar energy and battery storage is cheaper.

Out-of-state owners (Avista, Puget Sound Energy) must exit the Colstrip Power Plant due to Washington state law — not because of cost. Their departure gives NorthWestern Energy the chance to secure reliable, affordable, on-demand energy for our customers at no cost, ensuring Montanans’ energy needs are prioritized.

NorthWestern Energy is stuck in the past, relying on fossil fuels.

NorthWestern Energy’s Montana portfolio is among the cleanest in the U.S., with more than 58% wind, solar, and hydroelectric generation. The Colstrip Power Plant provides on demand generation in all weather, including when the wind isn’t blowing and the sun isn’t shining.

The Colstrip Plant is old, worn out, and unreliable.

In the last decade, the Colstrip Plant has been available more than 90% of the time when NorthWestern Energy needed its generation for our Montana customers. It provides dependable, on-demand power in all weather conditions.

New wind and solar farms will lower Montanans’ energy bills.

Wind and solar generation is low cost, but its construction and land requirements are very expensive. Building enough renewable energy (including the ability to store it) to match the Colstrip Power Plant’s on-demand reliability would cost hundreds of millions of dollars.

Montana’s energy needs can be met with existing generation.

Montana has relied too heavily on out-of-state energy, which can be expensive and unavailable when demand is highest. Owning more of the Colstrip Power Plant means that Montana has reliable, affordable power, especially when demand is high and the weather is extreme. This protects our customers from price spikes and supply shortages.

NorthWestern Energy’s acquisition of additional shares of the Colstrip Power Plant benefits the company’s shareholders, not Montana customers.

If the Colstrip Power Plant were to close before replacement generation resources are in place, Montanans’ energy service reliability and affordability would be jeopardized. This acquisition, at no cost to customers, ensures Montana has the energy it needs long into the future. 

Setting up a subsidiary for the Puget Sound Energy share of the Colstrip Power Plant by NorthWestern Energy is a violation of Montana law.

NorthWestern Energy is acquiring Avista’s share of the Colstrip Power Plant, which is adequate to serve our Montana customers’ energy demand today. 

Generation from the Puget Sound Energy share of the Colstrip Plant is not needed right now to meet our Montana customers’ energy demand. That’s why we’ve ensured that the costs to operate and maintain this share will not be included in Montana customer rates until it is needed to serve them.

This transaction is specifically structured to protect our Montana customers and fully complies with both state law and regulatory requirements.

NorthWestern Energy will sell the generation from the Puget Sound Energy share of the Colstrip Power Plant, but Montana customers’ rates will pay for its operation and maintenance costs.

The Montana Public Service Commission requires that the only costs in our customers’ rates are costs for the resources to provide them with energy service. 

The Puget Sound Energy share of the Colstrip Power Plant is being acquired by a subsidiary of our parent company, NorthWestern Energy Group, Inc. This means our Montana customers will not pay any costs related to that share unless and until it is needed to serve them.