The ‘green heat’ mapping gathers nearly 60 active actors in the following subsectors:

  • Geothermal energy: geothermal technologies make it possible to bring the heat of the subsoil back on the surface. The needs for heating can in this way be covered. In certain cases, when the extracted temperature is sufficient, it is also possible to produce electricity.
  • Heat pumps (HP): ‘very low geothermal energy’ results typically in the heating of houses with a heat pump. Three main categories of HP are generally distinguished: air-to-air HP (the air constitutes the source of heat), water source HP (water constitutes the source of heat) and geothermal HP (the ground constitutes the source of heat).
  • Solar thermal: the solar thermal market is made up by the individual solar water heater as well as collective installations (rest homes and communities). This technology can in addition be associated with the use of an HP; the production of heat by geothermal energy is indeed continues over time, in contrast to the energy of solar thermal.
  • Residential biomass: this sector, linked to the household’s market, is represented in the green heat mapping by 6 companies of reference.