Hi, I am from the uk and very interested in home power generation. I am aware that there is a system that you can install in the home which will 'sell' excess power back to the grid if for example you are running a wind turbine which produces more electricity than your home requires. In principle, could you setup a bike whereby pedalling will 'sell' energy back to the grid? I know that this energy production would be very small, but when I look at even medium sized wind turbines, it seems that the energy required to make the necessary revolutions of the wind blades turning a dynamo could be done using a bike chain/peddle setup by a reasonably fit person? I say it seems so but im guessing im making a grave miscalculation here although I'd like someone toexplain to me why. However as I said, would it in principle be feasible to make such a setup with a modified bike to 'sell' power back to the grid, no matter how small? What would be the main technical difficulties in making such a system? If anyone knows of some relevant resources I'd appreciate it.