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As the name signifies, this form of energy is based on heat possessed by the ocean. This energy makes use of temperature difference existing between the water layers at 800–1000 m depth to drive the turbine and thereby produce electricity using OTEC technologies. For effective operation of technologies, temperature difference of approximately 20 °C is needed. Water vapors produced from hot sea layers act as working fluid which runs the turbines. Key techniques used in the OTEC plant are open cycle (function via water from the sea), closed cycle (operates using NH₃ as working fluid) and hybrid cycle (blend of both the cycles) (Wilberforce et al. 2019).