http://www.geologievannederland.nl/onde ... aardwarmte
https://en.wikipedia.org/wiki/Earth%27s_energy_budgetThe geothermal heat flux from the Earth's interior is estimated to be 47 terawatts.[10] This comes to 0.087 watt/square metre, which represents only 0.027% of Earth's total energy budget at the surface, which is dominated by 173,000 terawatts of incoming solar radiation.[11]