California’s innovative Project Nexus is testing solar panels installed over irrigation canals, offering a dual solution for renewable energy generation and water conservation. Spearheaded by the Turlock Irrigation District (TID) with support from UC Merced, the pilot project began producing power in 2025. By shading the canals, the solar canopies significantly reduce water evaporation while generating clean electricity, addressing two of the state’s most pressing challenges: drought and energy demand.
A 2021 study estimates that covering the state’s roughly 4,000 miles of public water-delivery canals with solar panels could save up to 63 billion gallons of water annually — enough to irrigate 50,000 acres or supply over 2 million people. The same initiative could generate approximately 13 gigawatts of renewable electricity, about one-sixth of California’s current installed capacity. Additional benefits include improved water quality, reduced maintenance costs from limiting aquatic weeds, and minimal land-use conflicts since the panels use existing canal infrastructure. If fully scaled, Project Nexus could become a global model for integrating sustainable energy and water management in drought-prone regions. More