The plant uses a concept called Ocean Thermal Energy Conversion (OTEC). Inside the system is a liquid that has a very low boiling point (meaning that it requires less energy to evaporate), like ammonia. As ammonia passes through the closed system of pipes, it goes through a section of pipes that have been warmed by seawater taken from the warm (77 degrees Fahrenheit), shallow waters. The ammonia vaporizes into a gas, which pushes a turbine, and generates power. Then, that ammonia gas passes through a section of pipes that are cooled by frigid (41 degrees Fahrenheit) seawater pumped up from depths of around 3,000 feet. The gas condenses in the cold temperatures, turning back into a liquid, and repeats the process all over again. The warm and cold waters are combined, and pumped back into the ocean.