Floating Solar on One Canadian Reservoir Could Match a Dam's Yearly Output, Group Estimates
A floating solar array over one-tenth of the Williston Reservoir, the impoundment behind BC Hydro's W.A.C. Bennett dam, would yield 13,500 gigawatt hours a year, nearly matching the dam's annual hydropower output, in an estimate by the B.C. Sustainable Energy Association reported by Solar Builder.
The country works with a thinner solar resource than the United States. Drawing on U.S. Energy Information Administration data, Solar Builder put annual average insolation across the U.S. at 3.5 to 6.5 kWh/m²/day, against a Canadian range of 2.5 to 4.5 kWh/m²/day.
Hardware suppliers are tuning designs for those conditions. Ciel & Terre USA floating arrays tilt up to about 12 degrees, Chris Bartle of the company told Solar Builder.
Vertical mounting has already reached commercial scale. Sinn Power, based in Gauting, Germany, recently installed a 1.8 MW vertical floating solar plant in the Bavaria region, according to Solar Builder.
Across the border, Profloating built a 3.2 MW system at Cohoes, New York, described as the first municipally owned floating solar array in the United States, Solar Builder reported. The USD 8 million City of Cohoes project sits on the city's water reservoir and uses 5,880 panels rated at 545 Wp each.
Engineers have also tackled freezing water. On an Ontario stormwater pond, a 7 kW array pumped bubbles to draw warmer water up from the pond floor, keeping ice from trapping the panels, Solar Builder reported.
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