Iceland uses geothermal energy to produce electricity and heat. why didn't the people of samsø choose this energy source? it is very expensive to use. it isn't a very efficient energy source. it only works in areas close to hot zones or fault lines like iceland is. it can't be used to produce electricity. it is too cold in samsø to use geothermal energy. iceland uses geothermal energy to produce electricity and heat. why didn't the people of samsø choose this energy source? it is very expensive to use. it isn't a very efficient energy source. it only works in areas close to hot zones or fault lines like iceland is. it can't be used to produce electricity. it is too cold in samsø to use geothermal energy.