For over 150 years, the city of Pueblo, Colorado, has defined itself through the heat and grit of steel production. Today, that legacy is undergoing its most significant transformation in decades as the facility now known as Rocky Mountain Steel Mills navigates a complex transition of ownership, shifting from a sanctioned international parent to a domestic corporate structure focused on sustainable, high-performance manufacturing.
The mill, a cornerstone of the regional economy, has recently transitioned to the ownership of Orion Steel Companies following an acquisition by the investment firm Atlas Holdings. This move ends a period of prolonged uncertainty for the facility, which had been operating independently from its former UK-based parent company, EVRAZ PLC, since 2022. The transition is not merely a change in corporate letterhead but a strategic realignment aimed at securing the domestic supply chain for critical infrastructure, particularly the steel rail that powers North American transport.
Operating as a vital hub for rail, wire rod, rebar, and seamless OCTG pipe, the mill represents a unique intersection of industrial heritage and future-facing technology. By integrating massive solar arrays and electric arc furnace technology, the facility has positioned itself as a global leader in “green steel,” proving that heavy industry can pivot toward sustainability without sacrificing the output necessary to move a continent.
The Road to Orion: A $500 Million Industrial Transition
The shift in ownership began in earnest in June 2025, when it was announced that EVRAZ North America had agreed to sell its Pueblo operations, along with other North American assets, to the private equity firm Atlas Holdings. The deal was valued at up to $500 million, with the transaction finalizing in late July 2025.
This acquisition was driven largely by the geopolitical fallout of the Russian invasion of Ukraine. EVRAZ North America had been forced to operate independently since 2022 after international sanctions were imposed on Roman Abramovich, the former parent company’s primary figure. The sale to Atlas Holdings was viewed as a necessary step to provide the mill with long-term stability, regulatory clarity, and the investment capital required for modernization.
Under the new structure, Atlas reorganized its steel assets into the newly formed Orion Steel Companies. This group includes the Pueblo operation, now rebranded as Rocky Mountain Steel Mills, as well as other facilities located in Canada and Oregon. To lead this new venture, Doug Matthews, a former executive at U.S. Steel, was appointed as chief executive officer. The leadership has emphasized a commitment to domestic steelmaking and the continuity of operations for the rail and energy markets.
Pioneering the Solar-Powered Mill
While the ownership transition has dominated recent headlines, the mill’s operational evolution is perhaps its most impressive feat. Rocky Mountain Steel Mills has distinguished itself as the first and largest solar-powered steel mill in the world. This is achieved primarily through the Bighorn Solar project, which consists of 750,000 on-site solar panels capable of providing up to 95 percent of the mill’s electricity, according to official company data.
Beyond solar energy, the mill has completely abandoned traditional blast furnace methods in favor of Electric Arc Furnace (EAF) technology. This transition is critical for the industry’s carbon footprint; 100 percent of the mill’s steel is now produced via EAF, a process that generates 75 percent fewer CO₂ emissions than traditional steelmaking. This commitment to innovation has earned the company a ranking as a top 10 corporate solar adopter in the United States.
The facility’s capacity is equally significant, with an annual output of 1.1 million tons of EAF-based steel. By recycling nearly 1 million tons of scrap each year, the mill has become the largest recycler in the state of Colorado, effectively closing the loop on industrial waste while producing the high-performance steel required for North American infrastructure.
Economic Impact and Strategic Importance
The Pueblo mill is more than an industrial site; it is an economic engine for southern Colorado. The facility directly employs over 1,200 people and supports an estimated 10,000 direct and indirect jobs through a network of contractors, suppliers, and related industries. To date, the mill has contributed more than $600 million in local investment impacts, anchoring the city’s identity as a hub of steel and pride.
From a strategic perspective, the mill’s specialization in standard and premium rail makes it an indispensable asset for the North American railway system. The production of high-performance rail is a specialized niche of the steel industry, and the Pueblo facility is one of the few sites capable of meeting the rigorous demands of the continent’s rail networks. This strategic importance was a key factor in the optimism expressed by local leaders during the ownership transition; Colorado Governor Jared Polis described the move as a “vote of confidence” in the regional workforce and a renewable future.
The labor force has also been shielded from the volatility of the sale. The United Steelworkers union confirmed that a successorship clause in their contract ensured that the new ownership under Orion Steel Companies would honor existing labor agreements, providing essential stability for the 1,100 to 1,200 workers on site.
Key Facility Specifications
| Metric | Detail |
|---|---|
| Annual Capacity | 1.1 million tons of EAF-based steel |
| Energy Source | Up to 95% via 750,000 Bighorn Solar panels |
| Environmental Impact | 75% fewer CO₂ emissions than blast furnaces |
| Workforce | 1,200+ direct employees |
| Recycling Volume | Nearly 1 million tons of scrap annually |
What Which means for North American Infrastructure
The stabilization of Rocky Mountain Steel Mills under Orion Steel Companies ensures that the domestic supply of steel rail remains secure. In an era of volatile global trade and shifting geopolitical alliances, the ability to produce high-performance rail and seamless OCTG pipe (used in oil, gas, and geothermal drilling) within U.S. Borders is a matter of economic security.
The transition also provides a blueprint for other heavy industrial sites. The successful integration of large-scale renewables into a steel mill demonstrates that the “hard-to-abate” sector of manufacturing can move toward decarbonization without losing competitiveness. As North America continues to invest in rail and resilient infrastructure, the Pueblo mill stands as a critical link in the supply chain, combining a legacy that dates back to 1881 with the technology of 2026.
For stakeholders and industry observers, the focus now shifts to how Orion Steel Companies will leverage this “green” advantage to capture more of the domestic market. With a stabilized ownership structure and a leadership team experienced in large-scale steel operations, the mill is positioned to expand its output and further integrate sustainable practices into the broader North American industrial landscape.
The next confirmed checkpoint for the industry will be the ongoing operational reports from Orion Steel Companies as they integrate the Pueblo facility with their other North American assets. Further updates on production capacity and new contract acquisitions are expected as the new corporate structure fully matures.
Do you believe the transition to solar-powered heavy industry is the only way to save domestic manufacturing? Share your thoughts in the comments below.