Spanish engineers have updated the old citrus cliché, bringing it into the eco era — when life gives you oranges, make electricity. In Seville, they’re repurposing the many tons of fruit that the city’s 48,000 orange trees drop in the streets. Instead of a sticky, pulpy wintertime hazard, the methane from these rotting oranges will soon generate clean energy. Seville’s municipal water company, Emasesa, will start this new program by using 35 tons of fruit in a facility that already turns organic matter into electricity.