CleanPeak Energy agrees to acquire Sustainable Energy Infrastructure portfolio

CleanPeak Energy Holdings has agreed to acquire Sustainable Energy Infrastructure (SEI), an Adelaide-headquartered owner and developer of solar and battery assets, in a deal that strengthens the Sydney-based company’s distributed energy footprint across South Australia, New South Wales and Victoria.

SEI is owned and backed by a consortium of Australian superannuation funds, including Commonwealth Bank Group Super and MTAA Super. The company predominantly develops sub-5 MW projects in partnership with South Australian renewable energy company YES Group. Its portfolio includes 14 completed solar farms across SA, NSW and Victoria, and seven battery energy storage systems in SA and Victoria.

CleanPeak says its operating portfolio consists of over 40 MW of rooftop solar, 100 MW of utility solar projects and 35 MWh of battery projects, as well as microgrids providing energy and thermal services, with a further 100 MW of solar and 300 MWh of battery projects in the pipeline.

The acquisition follows CleanPeak’s recent expansion. In January 2026, the company grew its portfolio by 25 MW of solar and 100 MWh of battery storage with the acquisition of five solar farm developments in NSW from Sydney-based developer Fortitude Renewables.

Those assets are scheduled to be operational in 2027 and are expected to produce 90 GWh of energy per annum. In mid-2025, global investment firm KKR committed $500 million (USD 359 million) to partner with CleanPeak and assist the rapid growth of its distributed energy platform.

CleanPeak frames the SEI transaction as further momentum in building out its solar, storage and microgrid capabilities across Australia.