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Cloud Peak Energy

Former American coal producer focused on large, low-sulfur Powder River Basin mines in Wyoming and Montana.

Last updated August 22, 2026

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Overview

Cloud Peak Energy Inc. was an American coal mining company headquartered in Gillette, Wyoming. Its business was concentrated in the Powder River Basin, one of the largest coal-producing regions in the United States, where it operated large open-pit mines extracting coal from thick deposits. The company also held a 50% interest in Decker Coal Company, operator of the Decker Mine in Montana. The business emerged from Rio Tinto's coal operations in the United States. It was created as a corporate spin-off from Rio Tinto Energy America in 2009, although preparatory separation activity began earlier. Rio Tinto's 2009 annual reporting described the group as retaining a substantial minority interest in Cloud Peak Energy and its directly owned mines. Cloud Peak subsequently operated as an independent, publicly traded coal producer under the New York Stock Exchange ticker CLD. Cloud Peak's commercial proposition centered on the scale and comparatively low sulfur content of Powder River Basin coal. Its mines supplied utility customers in the United States and, through proposed and developing export channels, were also connected to ambitions for Asian sales. The company's principal operating footprint included the Antelope and Cordero Rojo mines in Wyoming and the Spring Creek mine in Montana. The Decker joint venture broadened its presence beyond Wyoming. The company also pursued the Big Metal Project, a proposed mining and logistics arrangement involving the Crow Nation in Montana. Under the plan, Cloud Peak's wholly owned Big Metals Coal subsidiary would mine coal on the Crow reservation for rail transport toward Pacific Northwest terminals and onward shipment to Asian markets. The project was associated with the nearby Spring Creek Mine and was named after a legendary Crow leader. The proposal reflected the industry's effort to find seaborne markets as domestic coal-fired electricity generation weakened, but it also faced the broader commercial and regulatory difficulties affecting new coal infrastructure. Cloud Peak's financial position deteriorated as coal demand and prices weakened. Powder River Basin producers faced declining demand from United States power generators, competition from natural gas and renewable energy, and difficulties developing export routes. Demand from East Asian markets also fell sharply relative to the expectations behind some export projects. In May 2019, Cloud Peak filed for bankruptcy protection. The filing marked the effective end of the company as an independent listed coal producer, and its operating assets were subsequently acquired or reorganized through the bankruptcy process. The company later attracted environmental scrutiny beyond the climate impact of its mining operations. Documents made public after the bankruptcy indicated that Cloud Peak had provided funding to organizations described by critics as promoting climate-change denial or opposing climate regulation and renewable energy. Named organizations included the Institute for Energy Research, the Center for Consumer Freedom, the American Legislative Exchange Council, the Montana Policy Institute, Americans for Prosperity, and Crossroads GPS. Cloud Peak representatives had previously rejected claims that the company had fought climate science or funded groups for that purpose. An analysis cited by The Guardian attributed approximately 0.1% of global industrial greenhouse-gas emissions from 1988 through 2015 to the company, reflecting the wider emissions associated with its historical coal production.

History

Cloud Peak Energy was formed through the separation of Rio Tinto's American coal interests and became an independent coal company in 2009. The transaction followed Rio Tinto Energy America's operation of major mines in the Powder River Basin. Rio Tinto's 2009 annual reporting indicated that it retained a 48.3% interest in Cloud Peak Energy and in directly owned mining assets at that stage. The spin-off gave the coal business a standalone corporate identity while preserving its focus on large-scale surface mining in the northern Rocky Mountain region. Cloud Peak's core operating base was the Powder River Basin, where thick coal seams support high-volume open-pit production. The company operated the Antelope and Cordero Rojo mines in Wyoming and the Spring Creek mine in Montana. It also held a 50% stake in Decker Coal Company, which operated the Decker Mine in Montana. These assets primarily produced thermal coal for electricity generation. Their scale and the relatively low sulfur content of Powder River Basin coal had historically made them competitive with coal from other American regions, particularly for utilities seeking to meet air-pollution requirements. As domestic coal-fired generation declined, Cloud Peak explored international demand and transportation infrastructure. One notable initiative was the Big Metal Project, conducted through the wholly owned Big Metals Coal subsidiary in cooperation with the Crow Nation. The proposal contemplated mining approximately 20 million tons of coal annually on the Crow reservation and moving the product by rail to Pacific Northwest terminals for shipment to Asian buyers. Spring Creek's existing facilities, located east of the reservation, were intended to support the project. The initiative was part of a broader effort by Powder River Basin producers to reach seaborne markets, but export projects encountered opposition, infrastructure constraints, permitting issues, and uncertain long-term demand. The underlying market weakened materially during the 2010s. U.S. power generators increasingly shifted toward natural gas and renewable energy, while environmental regulation and changing utility procurement strategies reduced the role of coal. Powder River Basin producers also encountered lower or less dependable demand in East Asia. These pressures affected both the value of Cloud Peak's existing mines and the prospects for export-led growth. The company's business therefore remained exposed to a structural decline rather than a temporary disruption in the thermal-coal market. In May 2019, Cloud Peak Energy filed for bankruptcy protection. Analysts cited severe reductions in demand for Powder River coal in the United States and East Asia as important factors. The bankruptcy ended the company's life as an independent publicly traded enterprise, and its assets were later acquired or reorganized through bankruptcy proceedings. The company is consequently treated as defunct rather than as an active listed brand. Cloud Peak also became the subject of climate-policy controversy. Materials made public after the bankruptcy indicated financial support for organizations that critics characterized as climate-change-denial or fossil-fuel advocacy groups. The cited organizations included the Institute for Energy Research, the Center for Consumer Freedom, the American Legislative Exchange Council, the Montana Policy Institute, Americans for Prosperity, and Crossroads GPS. Cloud Peak had previously denied fighting climate science or funding organizations for that purpose. Separately, The Guardian reported an estimate that linked the company to around 0.1% of global industrial greenhouse-gas emissions over the 1988–2015 period. These issues contributed to the environmental and governance scrutiny surrounding the company's final years.

  • 2019

    Bankruptcy filing

    [1]

    Cloud Peak filed for bankruptcy protection in May amid declining demand for Powder River Basin coal and deteriorating market conditions.

  • 2009

    Spin-off from Rio Tinto's American coal business

    [1]

    Cloud Peak Energy emerged as an independent company through a corporate spin-off from Rio Tinto Energy America.

  • 2009

    Rio Tinto reports retained interest

    [1]

    Rio Tinto's 2009 annual reporting described the group as retaining a 48.3% interest in Cloud Peak Energy and its directly owned mines.

Products and positioning

Large-scale, low-cost thermal coal producer serving United States electric utilities and pursuing selected export opportunities.

  • Thermal coal

    Powder River Basin thermal coal

    Cloud Peak's principal product was thermal coal extracted from large open-pit mines in Wyoming's Powder River Basin. The coal was sold primarily to electric utilities, with its relatively low sulfur content supporting use in power generation subject to air-quality requirements. Production economics depended on very high mine volumes, rail access, utility demand, and competition from natural gas and renewable power.

  • Montana thermal coal

    Spring Creek Mine coal

    Spring Creek Mine was one of Cloud Peak's major open-pit operations in Montana. Its output formed part of the company's western coal portfolio and was also connected to the proposed Big Metal Project, which sought to use nearby infrastructure and rail links to support shipments toward Pacific Northwest export terminals.

  • Joint-venture thermal coal

    Decker Mine coal

    Cloud Peak held a 50% interest in Decker Coal Company, the operator of the Decker Mine in Montana. The mine complemented Cloud Peak's directly operated Wyoming and Montana assets and expanded its participation in regional thermal-coal production.

Controversies

  • Funding of climate-skeptic advocacy organizations

    Documents made public after Cloud Peak's bankruptcy indicated that the company had funded several organizations criticized for disseminating climate-change skepticism or opposing renewable-energy and climate policies. Cloud Peak representatives had previously denied fighting climate change or funding groups that denied it.

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Marketing campaigns

  • Big Metal Project

    United States · East Asia

    Cloud Peak's Big Metals Coal subsidiary pursued a proposed project with the Crow Nation to mine coal on the Crow reservation and transport it by rail to Pacific Northwest terminals for export to Asia. The plan was associated with Spring Creek Mine infrastructure and reflected the company's attempt to develop international outlets for Powder River Basin coal.

    Outcome. The project did not become a durable replacement for weakening domestic coal demand before Cloud Peak entered bankruptcy.

Brand decisions

  • 2019

    File for bankruptcy protectionOther

    Background

    Cloud Peak faced declining demand for Powder River Basin coal in both the United States and East Asia, alongside broader structural pressure on thermal coal.

    Action taken

    The company filed for bankruptcy protection in May 2019.

    Aftermath

    Cloud Peak ceased to operate as an independent listed coal producer, and its assets were subsequently acquired or reorganized through bankruptcy proceedings.

  • 2009

    Separate the coal business from Rio TintoStrategy

    Background

    Rio Tinto reorganized its American coal operations into a separately identified company focused on Powder River Basin and related western coal assets.

    Action taken

    Cloud Peak Energy was established as the spin-off vehicle and operated as an independent publicly traded coal producer.

    Aftermath

    The separation created a standalone coal company, while Rio Tinto initially retained a substantial minority interest.

  • Pursue coal export access through the Big Metal ProjectStrategy

    Background

    Declining United States utility demand encouraged Powder River Basin producers to seek Asian markets and new transportation routes.

    Action taken

    Cloud Peak's Big Metals Coal subsidiary worked with the Crow Nation on a proposed reservation mining and rail-export project tied to Spring Creek Mine facilities.

    Aftermath

    The export strategy did not prevent the company's later bankruptcy as domestic and international coal demand weakened.

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