By providing low-carbon base-load power and heat from high-temperature hydrothermal resources, deep aquifer systems with low and medium temperatures, and hot rock resources, geothermal power is another renewable source of energy that could lead our planet towards meeting its sustainability targets. According to the International Energy Agency, geothermal electricity generation could reach 1 400 TWh per year. i.e. around 3.5 % of global electricity production, a force as powerful as pushing aside some 800 megatonnes (mt) of CO2 emissions per annum.