This is a very exciting prospect for the island of Kauai as they expect to chart their path to 100% renewable electricity by mid century. With Hawaii's RE policy which encourage healty growth of renewables, Kauai's 80% clean energy ambition would not be difficult to achieve.
The said project in Kauai is solar-charged water pumping system. This is how it is -- the island is almost entirely powered from RE at midday, and with some battery installed, part of the solar generated energy is stored in the battery bank. As the bank is fully stored, there is excess power that is suitable for pumping water to the reservoir which would then generate hydropower during the peak hours in the evening.
Beauty of Kauai.
View of Hanalei bay and Na Pali range. Photo credit: Steve Heap posted on Matador Network.
"It got to the point where we just didn’t have any more room in our daytime demand to take more solar." - Kauai Island Utility Cooperative, Brad Rockwell
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