The problem with "Selling back the energy" is that you will get f*cked by the system. <br><br>You pay x EUR for one kWh. You could get x EUR back if you deliver <i>the same kWh</i> back to the system. However, when you buy energy you pay taxes, but don't get your taxes back when you deliver energy. I look at this how I look at my photovoltaic cells on my roof. It's better to use the energy myself becuase I not only save the cost for the energy, but also everything that comes along with it and is calculated by kWh used.