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In a high-stakes move that underscores the surging demand for sustainable infrastructure, Swiss private equity titan Partners Group has struck a deal to acquire a minority stake in Spain’s leading waste treatment company, Gestcompost, in a transaction valued at €120 million ($133 million). The investment will be funneled through the firm’s infrastructure secondaries arm as part of a broader €250 million fund initiated by Gestcompost’s parent company, Suma Capital.

A Strategic Bet on Biomethane Expansion

Partners Group has been meticulously tracking Gestcompost’s trajectory, citing the company’s unparalleled expertise in waste treatment and privileged access to high-quality feedstock as key competitive advantages.

“There is immense potential for Gestcompost to capitalize on its market-leading position and vast asset base to drive expansion into biomethane production,” said Dmitriy Antropov, head of infrastructure partnership investments at Partners Group.

While the exact size of Partners Group’s stake remains undisclosed, the Swiss investor has secured two seats on Gestcompost’s board. Alejandro Lafarga, CEO of Spanish gas giant Madrileña Red de Gas, will represent Partners Group’s clients as vice chair.

Waste Management Meets the Energy Transition

Founded in 2003, Gestcompost is Spain’s largest organic waste treatment operator, with an annual capacity of 1.2 million tons. Its facilities process a broad range of waste, including industrial, agricultural, and urban organic by-products. The company converts waste into compost or harnesses anaerobic digestion to generate biogas and biomethane—critical renewable energy sources accelerating Europe’s transition away from fossil fuels.

The deal comes amid sweeping regulatory shifts in Spain that are driving up landfill costs and tightening waste disposal regulations. These factors, combined with a broader push toward cleaner energy, are expected to make Gestcompost’s operations increasingly lucrative in the years ahead.

Legal and Financial Forces Behind the Deal

International law powerhouse Clifford Chance LLP is advising Suma Capital on the fundraising. Partners Group’s legal counsel details were not immediately available.

Scaling for a Sustainable Future

The Swiss investment firm has pledged to work alongside Gestcompost’s management and Suma Capital to ramp up waste processing volumes and acquire additional biomethane plants. The investment aligns with Partners Group’s broader strategy of targeting high-growth, impact-driven infrastructure assets.

This move follows the firm’s €1 billion sale of Greenlink Interconnection—a major subsea electricity connector—to Baltic Cable AB and London-based infrastructure investor Equitix in March, marking another significant shift in its renewable energy and sustainability portfolio.

As waste treatment and renewable energy continue to intersect, Partners Group’s latest investment signals confidence in a future where sustainability and profitability go hand in hand.