Ocean thermal energy conversion (OTEC) is the process of deriving energy from the difference in temperature between surface and deep waters in the tropical oceans. The OTEC process absorbs thermal ...

Solar panels on rooftops. Wind turbines on hilltops. Renewables joining a power grid that still runs, at its core, on coal and gas. The targets sound good: 35% clean energy by 2030, 50% by 2040.