 SIR - Leonie Greene (Letters, September 7) writes that "renewables" will add only ?19 to the average energy bill this year. But the Ofgem website states that the anticipated cost of the Renewables Obligation scheme in 2011-12 is ?1.487 billion.  By my reckoning, this equates to an average cost of ?57 for each of the 26 million households in Britain.  To be sure, the cost of renewables will be met by consumers, directly through our electricity bills or indirectly in the cost of the goods we purchase.  Clive Marshall  Curthwaite, Cumberland