The world is quickly running out of petroleum resources, so scientists are searching for new ways to find energy. Energy from ocean waves is one idea and it is clean energy. A wave-generator machine has rotors and floats on the ocean. When waves enter the machine, which creates electricity. More reliably, OTEC power plants can make electricity using temperature changes in the ocean. But critics argue that the amount of energy produced by a lot of wave machines is too small. it can barely provide enough power for a large city