A new state-funded project in the San Joaquin Valley hopes to find a new way to build drought resilience. The idea is simple: Cover the state’s canals and aqueducts with solar panels to both limit evaporation and generate renewable energy.
“If you drive up and down the state, you see a lot of open canals. And after year after year of drought it seemed an obvious question: How much are we losing to evaporation?” said Jordan Harris, co-founder and chief executive of Solar AquaGrid, a company based in the Bay Area that’s designing and overseeing the initiative. “It’s just common sense in our eyes.”
The California Department of Water Resources is providing $20 million to test the concept in Stanislaus County and to help determine where else along the state’s 4,000 miles of canals — one of the largest water conveyance systems in the world — it would make the most sense to install solar panels. The project is a collaboration between the state, Solar AquaGrid, the Turlock Irrigation District and researchers with the University of California, Merced, who will track and analyze the findings.
“This hasn’t been tried in the U.S. before,” said Roger Bales, an engineering professor at U.C. Merced who specializes in water and climate research. “We want these to eventually be scaled across the western U.S., where we have a lot of irrigated agriculture and open canals.”
California’s efforts got a jump start from a 2021 study published by Bales and his colleagues, who determined that covering the state’s canals with solar panels could reduce evaporation by as much as 90 percent and save 63 billion gallons of water per year — enough to meet the residential water needs of more than two million people.
The team identified other possible upsides: The installations could generate large amounts of energy; reduce algae growth and the need for maintenance by limiting sunlight falling on the water; enhance the functioning of the solar panels by allowing them to stay cool near the water; and improve air quality by creating an energy source that would limit the need for diesel-powered irrigation pumps.
The sheer number of benefits documented in the study eased hesitations about the idea and “kind of changed our thinking,” said Josh Weimer, spokesman for the Turlock Irrigation District, which volunteered its 250 miles of canals in Stanislaus County for the pilot. Another benefit for the district, which is also a power provider, is that it doesn’t need to buy new, costly tracts of land to install solar panels since the canals are already its property.
by Soumya Karlamangla, NY Times | Read more:
Image: Solar AquaGrid
[ed. Sounds like a no-brainer, unless they end up installing fencing which would disrupt animal movements.]
