Since then there's been a lot of wind farms installed in Hawaii and most homes have solar powered water heaters (from personal observation). Don't know anything about the sea cooling concept but it seems viable and for long time cornell has done it or at least on a tour they said they did https://fcs.cornell.edu/departments/energy-sustainability/ut...
Talking to locals in Maui most aren’t very happy with the wind farms. They’re considered an eye sore and they were sold under the pretense of lower electricity bills which never happened.
https://www.ithacajournal.com/story/news/local/2015/10/02/co...
Interesting..