sentences:  The Icelandic government also believes that there are many more untapped geothermal sources throughout the country, estimating that over 20 TWh per year of unharnessed geothermal energy is available.This is about 3.3% of the 600TWh per year of electricity used in Germany.Combined with the unharnessed feasible hydropower, tapping these sources to their full extent would provide Iceland another 50 TWh of energy per year, all from renewable sources.