Ocean thermal energy conversion (OTEC) uses the temperature difference between cooler deep and warmer shallow or surface seawaters to run a heat engine and produce useful work, usually in the form of electricity.
Abiotic examples include things that are not alive but you will find in an ecosystem such as air, gases, water, sand, stones and rocks.
Abiotic factors are all of the non-living things in an ecosystem. Abiotic factors come in all shapes and sizes. They can be as small as a rock or as large as the sun. No matter what its size, each abiotic factor plays an important role in an ecosystem.