Seville, Spain, is home to 48,000 bitter orange trees. The oranges are beautiful while on the trees, but they aren’t eaten and so need to be cleaned off the city’s streets and sidewalks. Now Seville has a pilot program underway that seeks to turn the methane produced as the fruit ferments into clean electricity. While the pilot program is small, the city hopes to be able eventually to recycle all of the city’s oranges. “It’s not just about saving money. The oranges are a problem for the city and we’re producing added value from waste,” said Benigno Lopez, head of the municipal water company, Emasesam, which launched the scheme. Emasesa plans to use the clean electricity to run one of the city’s water purification plants.