Waves, currents and tides provide an endless source of clean energy now being harnessed by a wide range of technology. Marine energy, also known as ocean energy, uses the heat found below the surface of seas and oceans to provide cooling. It is also a source of renewable energy.

The concept is simple: seawater is sourced at a temperature of between 12°C and 25°C just off the coast at a depth of 5-10 metres. This water is used to warm or cool a freshwater loop according to seasonal needs. The loop is linked to heat pumps that are either centralised or located near buildings, which warm the water to the temperature needed to provided heating or air conditioning. These pumps can supply end users via a district heating network spanning a distance of several kilometres.

Marine energy contributes to energy savings and helps reduce CO2 emissions in line with the drive to promote sustainable development.