Ocean thermal energy conversion


How it works

The thermodynamic cycle (Rankine) produces energy due to the temperature difference between a heat source and a cold source. Ocean Thermal Energy Conversion (OTEC) harnesses the difference in temperature between surface waters (about 25°C) and deep waters (+0.6 mile deep, about 5°C). Such difference in temperature can be found in tropical waters, where electricity can be produced 24/7.


Our vision

Naval Energies offers customised solutions based on harnessing temperature differences in the ocean and provides made-to-measure projects that vary in size. Designed for islands and isolated areas, this non-intermittent base-load energy source could in the medium-term, provides a green alternative to fossil energies (gas, diesel, coal) that are still massively used on remote tropical, which are not connected to continental power grids.

This concept based on ocean thermal gradients, will help overseas territories in becoming energy self-sufficient as well as environment friendly.


Focus on our projets

10_prototype-o%cc%88-terre-etm-landbased-otec-prototypeNaval Energies is in pole position to support alternative energy production in overseas territories based on a land-based OTEC prototype operating in La Réunion, a French island located in the Indian Ocean. DCNS has been running tests in the island with the objective to continue improving the efficiency of the power-production system and optimise costs of OTEC technology.Moreover, extension works realized in 2016, allow Naval Energies to continue qualification tests (thermodynamic and thermal) on exchangers and to obtain reliable results, which can be full-scale extrapolated.

11_echangeur-prototype-o%cc%88-terre-etm-landbased-otec-prototype-exchangerMARLIN project, awarded by ADEME and dealing with the development of technological locks on OTEC, has allowed Naval Energies to drive qualification studies and tests on critical issues and equipments such as riser, exchangers or biofouling since 2014.


In 2014, DCNS (i.e. Naval Energies) and its partner Akuo Energy have been selected as part of the European NER 300 programme to develop a pilot offshore OTEC plant in the Martinique Island (French overseas territories). Due to be operational in 2020, the 10MW floating power plant NEMO (New Energy for Martinique and Overseas) is designed to supply electricity to 35,000 homes.