Aquila Energy Efficiency Trust PLC is a closed-ended investment company focused on small to medium-sized energy efficiency projects in the private and public sectors in Italy, Spain, Germany, and the United Kingdom. It 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. The company was formerly known as Parvus Energy Efficiency Trust PLC and changed its name to Aquila Energy Efficiency Trust PLC in April 2026. Incorporated in 2021, it is based in London, the United Kingdom.