On July 12th MEIC and Sierra Club reached a historic agreement with Puget Sound Energy and Talen Energy to retire the oldest and most financially risky coal-burning units at the Colstrip coal plant in Colstrip, Montana. Units 1 and 2 – which were built in the 1970s and lack state-of-the-art pollution controls – have faced serious problems remaining competitive as energy markets shift dramatically. Meanwhile, Washington and Oregon, which are the main customers for Colstrip’s electricity, have sent clear signals that they no longer want coal-generated power and prefer more clean energy. Under the agreement, which was filed with the District Court in Missoula, Pennsylvania-based Talen and Seattle-based PSE have until July 2022 to retire the two units.

Colstrip american flag

Colstrip coal-fired power plant.

This decision marks an opportunity to use Colstrip’s existing transmission system to build out more clean energy and export it to Washington and other states. The American Wind Energy Association ranks Montana third for wind power potential in the United States. Montana’s wind resource has the potential to power 6.4 million average homes by 2030 according to the U.S. Department of Energy. A timeline highlighting events and developments that preceded the announcement of today’s agreements is available online at:

MEIC’s Anne Hedges issued the following statement:

“This agreement provides the certainty we need to begin creating a plan to tap Montana’s abundant wind energy and continue supplying electricity to West Coast markets. Those markets are demanding cleaner energy and we have the ability to provide them with a 21st Century energy source. If we can’t do that, Montana will lose an important opportunity to modernize and diversify its energy system.

“This agreement provides certainty for addressing grievous pollution issues and gives the two units six years to go offline, although the market may prove less tolerant of that length of time. Talen’s CEO recently said it will lose millions of dollars operating the plant this year alone. We need a plan for a different energy future. We can meet markets and customers’ demands, create jobs and take advantage of the existing transmission line if we are prepared.”

Mike Scott, the Sierra Club’s senior organizing representative in Montana, issued the following statement:

“Montana’s energy landscape is changing. We want to keep Montana competitive. We have the clean energy potential and a talented workforce to meet these changes head on. This is an opportunity to build clean energy right here at home so customers in Washington, Oregon, California and other states are running off of Montana made energy.

“We want to work with the power plant owners, the community of Colstrip and Montana to plan for a transition that maximizes employment in clean-up, remediation and new renewable energy development in the Colstrip area.”


Legislatures in both Oregon and Washington passed measures this year directly affecting Colstrip. In March, Oregon Gov. Kate Brown signed legislation requiring the state to be completely coal-free by 2030 and to get 50 percent of its electricity from clean energy sources by 2040. Within weeks, Washington Gov. Jay Inslee signed a law creating a funding mechanism specifically to help PSE pay for the retirement and cleanup of Colstrip Units 1 and 2.

The Colstrip agreement stems from legal action that the Sierra Club and MEIC brought against the plant in 2013, alleging major air pollution-related violations of the Clean Air Act. The agreement also requires Talen and PSE to begin ramping down dangerous levels of sulfur and nitrogen pollution until closure to resolve ongoing air quality problems. The agreement ensures, whatever the vagaries of the market, that Colstrip’s pollution of Montana’s air, land and water will be permanently reduced and significantly remediated.

Colstrip’s two newer units, built in the 1980s, are not covered by the agreement and will continue to run.

This settlement will be lodged with the court and is subject to a 45 day review period by the U.S. Environmental Protection Agency and the U.S. Justice Department.

PDF Press Release: Colstrip Settlement Press Release

One Reply to “Oldest two units at Colstrip to be retired no later than 2022”

  1. Howard Christiansen says:

    Thank you MEIC and the Sierra Club for all the fantastic work you do.