I would produce your own ! I use the water analogy as its easier to visualise, also mention that the Electricity doesnt actually go to the "Grid" it will most probably go to the neighbours house !
where the neighbour buys it from their energy co at 14p and currently you sell at 3p - Easy money by the energy companies, plus hardly any losses in the lines (unlike power from the power stations 20%+). Another point to make on the DECC consultation feedback ¬!!