SUSI Partners

SUSI Partners is an investment manager focused on mid-market energy transition infrastructure. The firm specializes in originating, executing, and managing investments across renewable energy, energy efficiency, energy storage, and electrification. They deploy both equity and credit solutions, covering diverse infrastructure risk profiles, with an emphasis on value creation and risk management.

As early participants, SUSI Partners cultivated expertise in sustainable infrastructure finance. In January 2026, the firm became part of Gresham House, integrating into a global platform. This strategic move combined specialized knowledge with enhanced scale, addressing the expanding institutional demand for green infrastructure.

SUSI Partners serves institutional investors, offering tailored strategies based on risk-return and geographic focus. The firm’s vision is to accelerate the global energy transition by funding essential infrastructure. Their operations cover Europe, complemented by a dedicated strategy to advance energy transition initiatives in Southeast Asian emerging markets.