The recovered fuel specialist will be providing the Newport-based Alexandra Docks plant with a minimum of 220,000 tonnes of refuse-derived fuel (RDF) each year, in a 25-year deal.
The plant is scheduled for completion in early 2022. Once operational, it will provide enough energy to the grid to power 50,000 homes each year.
Mark Terrell, director at Andusia, said: “We are delighted to have signed such an extensive sole waste supplier contract in the UK.
“Andusia [is] committed to supporting new UK infrastructure and will continue to work with both investors and developers to bridge the gap between waste suppliers and plants."