MEIC is known throughout Montana and the West as a strong advocate for a clean and healthful environment that backs advocacy with hard science and thorough research. We have been called “perhaps the most influential and active environmental organization in the state” and for good reason. For 50 years, MEIC has fought for policies that will affect the Montana environment for generations to come. Below is a list of MEIC’s biggest accomplishments, but does not include the full breadth of our work and success.

At the Legislature

MEIC is the lead voice for the environment at the Montana Legislature. We have played a role in lobbying to establish, protect, and strengthen almost every environmental law on the books, including but not limited to the Montana Environmental Policy Act, the Subdivision and Platting Act, the Major Facility Siting Act, the Strip and Underground Mine Reclamation Act, the Voluntary Conservation Easements Act, the Coal Severance Tax Trust Fund, the Metal Mine Reclamation Act, the Comprehensive Environmental Clean-up and Responsibility Act, the Mega Landfill Siting Act, the Water Use Act, and the Renewable Energy Standard. MEIC has also played a lead role in defeating hundreds of anti-environmental bills that are not listed his.

Victories at a Glance


  • MEIC lobbied for the successful passage of two right-to-know laws and defended the Montana Constitution, clean water, clean energy, and our climate at the 2023 Montana Legislative Session.
  • In April, a district court judge ruled in favor of MEIC and local communities based on air quality and climate issues against NorthWestern Energy’s polluting methane gas plant near Laurel.
  • A federal judge ruled against Signal Peak’s request for a coal mine expansion in a lawsuit from MEIC and partners in February.


  • After nearly a decade of advocacy, litigation, and working with partners, the Smith River is one step closer to protection from a damaging copper mine on its headwaters after an April 2022 decision by a Montana state judge.
  • MEIC won a lawsuit that found the Rosebud coal mine expansion was illegal due to damage to Colstrip area waters, wildlife, and the climate.
  • With three new staff positions, MEIC has expanded its capacity for movement building, working on land use issues, and helping raise public awareness of Montana’s largest contributors to the climate crisis.
  • Two Bull Mountain coal mine legal victories have, so far, prevented more than 190 million tons of greenhouse gasses from entering the atmosphere.
  • With urging from MEIC’s members and supporters,  the State of Montana adopted new, more energy efficient building codes in June 2022, which will reduce carbon emissions in new buildings and enable cities and counties to implement net-zero and solar-ready building zones.
  • A district court decision in November 2022 vacated a subdivision permit in Big Sky due to Montana DEQ’s faulty analysis of the development’s contribution to water pollution in the Gallatin River.
  • A district court decision in April 2022 requires NorthWestern Energy to pay $2.5 million in fines to Montana’s Low-Income Energy Assistance Program due to its failure to purchase energy from Community Renewable Energy Projects (CREPs).


  • A legal victory prevented a large expansion at the Spring Creek coal mine on the basis that the operator didn’t sufficiently consider emissions such as CO2 and mercury.
  • MEIC and partners stopped the proposed Rock Creek mine in the Cabinet Mountain Wilderness due to impacts to bull trout and grizzly bears.
  • MEIC stopped dozens of anti-environment and anti-public health measures at the Montana legislature by helping Montanans contact legislators over 46,000 times through an updated website.
  • MEIC and partners defeated a last minute Trump-era rule designed to prevent consideration of science in public health and environmental decision-making.


  • MEIC secured a PSC decision preventing NorthWestern Energy from charging approximately $10 million to customers for costs associated with a prolonged outage at the Colstrip coal-fired power plant.
  • MEIC secured a PSC decision preventing NorthWestern Energy from purchasing a larger share of the Colstrip coal-fired power plant.
  • MEIC and Earthjustice receive favorable Montana Supreme Court order upholding the vacature of the proposed Montanore mine project’s discharge permit in the Cabinet Mountains Wilderness.
  • MEIC and partners win a federal court challenge reinstating a Bureau of Land Management methane waste rule that the Trump administration attempted to dismantle.
  • MEIC wins a U.S. District Court challenge that results in the cancellation of oil and gas leases on over 145,000 acres of public land in Montana due to potential water quality and climate impacts.
  • MEIC wins a Supreme Court victory striking down Montana Public Service Commission decisions that intentionally undermined renewable energy projects by weakening contract terms.
  • Colstrip Units 1&2 permanently close in response to economic pressure combined with MEIC’s legal settlement requiring closure by 2022.


  • MEIC leads a successful legislative lobbying effort in defeating dozens of anti-environmental bills and blocking multiple proposals to bail out NorthWestern Energy and its investment in Colstrip.
  • MEIC wins two major Montana District court challenges against mines that would impact water quality and quantity in the Cabinet Mountains Wilderness.
  • MEIC wins a court case against Montana Public Service Commission restoring favorable contract lengths for renewable energy projects.
  • MEIC blocks an expansion of the Spring Creek coal mine by arguing climate change impacts must be evaluated alongside the mine’s economic benefits.



  • MEIC wins a lawsuit preventing expansion of Signal Peak Energy’s Bull Mountain Coal Mine due to lack of a climate change impact evaluation.







  • MEIC leads the successful campaign to stop the proposed Roundup coal-fired power plant.


  • MEIC forms a coalition that successfully lobbies the legislature to adopt the Montana Renewable Energy Standard.


  • Initiative 147, which would have repealed I-137, is defeated by the voters.



  • MEIC keeps Holcim Cement Co. from burning tires, smelter slag, and hazardous waste.


  • MEIC wins a lawsuit that stops the construction of a sprawl-inducing Forestvale interstate highway interchange in the Helena valley.




  • Pegasus Gold Co. is fined $37 million for violations at the Zortman/Landusky mines and files for bankruptcy.


  • MEIC wins a lawsuit that ended the confidentiality of legislative bill draft files.


  • MEIC wins the first of three lawsuits over the reclamation of the Golden Sunlight mine.


  • MEIC wins a lawsuit that stopped CENEX from drilling for oil on the North Fork of the Flathead River.


  • Sunshine Mining Co. abandons plans for a gold mine west of Lincoln.


  • A phosphate detergent ban is passed by the Legislature.


  • MEIC wins a lawsuit that stopped the Montana Power Co. from building the Haines Pipeline along the Rocky Mountain Front.


  • Air quality standards are adopted by the Board of Health and Environmental Sciences.


  • Coal severance tax raised to 30% by the Legislature.

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