All the food waste from East Sussex and Brighton & Hove will be taken to the Woodlands In-Vessel Composting facility in Whitesmith, near Golden Cross, run by Veolia.
Manager Colin Hirsh said: “All this used to go into landfill, now we make a really high quality product with it that helps condition our soil.
“We’re really proud of what we do here.”
He said while 3,000 tonnes of waste were collected from Lewes district in 2013, subsequent years have seen just 1,000 tonnes collected.
“We think once people saw the amount of waste they were producing they took action to reduce what they wasted,” he added.