Ocean energy definition. Ocean energy refers to the renewable energy harnessed from the oceans and seas, utilizing various technologies to convert tidal movements, wave actions, and thermal gradients into usable power. Marine energy, also known as ocean energy, ocean power, or marine and hydrokinetic energy, refers to energy harnessed from waves, tides, salinity gradients, and temperature differences in the ocean. Around 70% of the Earth’s surface is covered by oceans. Marine energy is a renewable power source that is harnessed from the natural movement of water, including waves, tides, and river and ocean currents. The oceans contain a huge amount of energy. Generally ocean energy manifests itself in three ways: thermal, mechanical, and chemical (salinity gradient energy). Ocean energy represents the various types of renewable energy that can be derived from oceans or other marine sites. The majority of ocean energy technologies are still in research and development. Marine energy can also be harnessed from temperature differences in water through a process known as ocean thermal energy conversion. Changes in salinity, thermal gradients, tidal currents or ocean waves can be used to generate electricity using a range of different technologies. Ocean energy, also known as marine energy or hydrokinetic energy, is an abundant renewable energy resource that uses ocean water to generate electricity. . Jun 18, 2025 ยท Ocean energy, often referred to as marine energy, encompasses a diverse range of technologies aimed at capturing and converting the immense energy resources inherent in the world’s oceans into usable forms of power, primarily electricity. c7zkc 4gl8w nnmoru qt6a b5sf kkc i7a 5oje iinxlb e64