I think you are off by about 3 orders of magnitude as my Austrian flat need about 7MWh a year for heating and 3MWh of electricity. I could generate 24kWh per ye

I think you are off by about 3 orders of magnitude as my Austrian flat need about 7MWh a year for heating and 3MWh of electricity. I could generate 24kWh per year on an indoor bicycle.