Parvus Energy Efficiency Trust PLC, a closed-ended investment company, focuses on investments in small to medium-sized energy efficiency projects in the private and public sector in Italy, Spain, Germany, and the United Kingdom. The company invests in and manages receivables and notes generated from energy efficiency and renewable energy projects, including building retrofits, water management, solar photovoltaic (PV) installations, heating systems, lighting, and wind. Aquila Energy Efficiency Trust Plc was formerly known as Parvus Energy Efficiency Trust PLC and changed its name to Aquila Energy Efficiency Trust Plc in April 2026. The company was incorporated in 2021 and is based in London, the United Kingdom.