Demand for solar power is growing. And recent research suggests that people should consider installing solar panels not only on fields and rooftops, but above waterways as well. Brandi McKuin of the University of California, Santa Cruz, says canopies of solar panels can be installed over canals. The approach would generate clean energy, and by shading the water, reduce evaporation. Her research estimates that covering California’s 4,000 miles of open canals with solar panels could save about 65 billion gallons of water a year.