Project Director Nick Ash said there are other similar projects across the world but the specific Wiltshire one is a world first.

“What comes out of the top of the gas engine [the one already generating energy] is quite clean CO2. In Europe, that’s already used in greenhouses, so we would get that into our greenhouses.

“So you’d grow them [vegetables and fruit] in a rich CO2 environment so they’d grow better than in normal air,” he explained.

“They [the plants] will be the using the heat, the light and the power, but they will have no contact with the ground at all.”

The system at the moment takes the gases from the landfill and extracts the methane for power and cleans the gases – for example, by removing hydrogen sulphide and using bacteria – with cleaner CO2 a by-product of the process.