At the heart of this acquisition lies a synergy between Gresham House’s dominance in the UK’s battery energy storage market and SUSI Partners’ proven expertise in renewable energy generation, energy efficiency, and sustainable infrastructure financing. Founded in 2009, SUSI Partners has built a 15-year track record with a portfolio that spans 31 countries and four core themes: producing clean energy, boosting efficiency, enabling clean energy integration, and electrifying energy use. With over 7 GW of renewable assets and thousands of financed projects, their efforts have already avoided 4.5 million tonnes of CO2 emissions, with lifetime impact projected at 21.8 million tonnes. By joining forces, the combined entity becomes a heavyweight in the sector, offering a full-spectrum approach to global energy transition.

Geographic diversification is central to this deal. While Gresham House has been deeply rooted in the UK, SUSI Partners extends its influence across continental Europe, the Americas, and Asia-Pacific. Notably, its Asia strategy has invested $259 million into renewable platforms across Thailand, Vietnam, the Philippines, and Cambodia, including flagship assets like Vietnam’s Dam Nai wind farm. These regional portfolios not only provide renewable energy for thousands of households but also demonstrate the scalability of sustainable infrastructure in emerging markets. By absorbing SUSI’s credit and equity strategies, Gresham House is not just diversifying its portfolio—it is embedding itself in the world’s fastest-growing clean energy markets.

Beyond numbers, the deal symbolizes a strategic shift. All SUSI Partners employees will transition to Gresham House, with SUSI’s CEO set to lead the newly combined Energy Transition division. This continuity ensures that expertise in managing renewable assets, efficiency projects, and innovative financing structures is retained. For investors, the integration signals stronger global scale, more robust pipelines, and broader access to investment opportunities across renewables, storage, and electrification. With the Energy Transition division now managing £2.7 billion in AUM, Gresham House is well-positioned to capture rising institutional demand for climate-focused investment strategies.

Gresham House’s acquisition of SUSI Partners marks more than just corporate growth—it reflects a decisive step toward building one of the world’s leading platforms for sustainable infrastructure. As regulatory approvals progress, this union reinforces a vision of a low-carbon future driven by global collaboration and innovative financing.

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