globally, an estimated 1,800 twh of tidal energy exists per year. there are several tidal power plants around the world, including large ones in south korea, france, and canada. the largest tidal plant produces 0.5 twh/year, which can power 46,000 homes annually. calculate the number of homes that can be powered by 50 twh of energy. calculate the number of tidal plants needed to power 92,000 homes annually.