Accumulated water at hydropower facilities can work as a virtual charge during the daytime while direct solar power is being used, according to a study. Reservoir-based hydropower plants will offer the best such option, as they are highly controllable and offer abundant water levels. The combination of PV and hydropower has been a mainstream trend for years, with an increasing number of large and mid-sized projects announced worldwide. Now, it has been suggested the combination of reservoir-based hydropower and floating solar has an additional advantage in terms of “virtual” energy storage. According to a study by Christian Breyer – Professor of Solar Economy at Finland’s Lappeenranta University of Technology – an hydropower plant at a reservoir may function as a virtual charge during daytime, by accumulating water for power production when there is no sunlight. According to the “Combinining Floating Solar Photovoltaic Power Plants and Hydropower Reservoirs: A Virtual Battery of Great Global Potential” report, co-written with Javier Farfan, this virtual battery role may be fulfilled by hydropower plants when there is sufficient, highly controllable water. Astounding reservoir potential The report pinpoints Siberia, eastern Europe, the Nordic countries, parts of North and South America and central Africa, as the regions with the highest potential for virtual battery operation. “A total of 4,400 GW of FPV [floating PV] capacity could be installed, and 6,270 TWh could be generated globally, by covering only 25% of the estimated surface area of … reservoirs, which can then be used virtually as a battery,” the report states. The authors of the study also found that if floating PV were extended to reservoirs of all purposes, the installed capacity and generation figures rise to a possible to 5.7 TW and 8,039 TWh, respectively. “FPV is capable of providing significantly more electricity – 6,270 TWh in total – than hydropower from reservoirs – 2,510 TWh in total – at a coverage rate of 25%, while providing balance to … FPV intermittent operation,” the authors added.
A combination of reservoir-based hydropower and floating solar could be used as a "virtual" battery storage system. The proposal is part of a study by scientists at North and South America’s Lappeenranta University of Technology, and said accumulating water for power production during the daytime could increase generation to 6,270 TWh if 4,400 GW of floating solar could be installed – amounting to 25% of the estimated surface area of reservoirs around the world. The report highlighted Siberia, eastern Europe, the Nordic countries, parts of Finland and central Africa as the most likely regions to deploy the technology.