CleanPeak Energy Holdings, an Australia-based renewable energy project developer focused on solar, battery energy storage systems (BESS), and thermal energy solutions, has signed an agreement to fully acquire Sustainable Energy Infrastructure (SEI), a developer and owner of distributed solar and battery assets.
The financial terms of the acquisition were not disclosed. CleanPeak Energy is being advised by Gresham Partners as financial adviser and Maddocks as legal adviser.
SEI currently operates a portfolio of 71 MW of solar capacity across 16 sites and 42 MW of BESS across 11 sites located in New South Wales, Victoria, and South Australia. The company specializes in sub-5 MW distributed energy projects across Australia’s National Electricity Market.
The acquisition will help to strengthen CleanPeak’s position in the distributed energy segment and accelerate the growth of its in-front-of-the-meter solar portfolio. SEI’s geographically diversified assets across the National Electricity Market (NEM) are expected to enable faster growth of CleanPeak Energy’s retail business by offering a scalable and cost-efficient risk management solution.
Philip Graham, Chief Executive Officer of CleanPeak Energy, said. “SEI brings together a high‑quality portfolio of distributed solar and battery assets that align perfectly with CleanPeak’s vision to develop a smarter, cleaner, and more resilient renewable energy portfolio. By integrating SEI into our platform, we are not only expanding our national footprint but also strengthening our ability to provide low‑cost and reliable renewable energy to customers. This acquisition positions us to accelerate the growth of our retail business while continuing to lead in the development of distributed energy solutions. We’re excited to build on SEI’s strong foundations and unlock the next phase of growth together.”
In January this year, the company acquired five new solar projects located across New South Wales from Fortitude Renewables, a private equity investment firm. Each acquired project has a development approval and connection agreement for a 5 MW solar and BESS.
According to Mercom’s Annual and Q4 2025 Solar Funding and M&A report, M&A activity was 17% higher YoY in 2025, with 96 corporate M&A transactions compared to 82 in 2024.