Well, in justification for the latest round of price hikes, BG are saying that they are raising them because of the wholesale cost of gas, and the cost of upgrading the National Grid.
The impact of the costs associated with transitioning from fossil fuels was examined recently. the committee concluded;
"In its latest detailed review of consumer bills in December, the Committee on Climate Change made it clear that the 60% rise in consumer electricity bills that we have seen between 2004 and 2010 was primarily caused by an increase in wholesale prices, especially gas. In fact, of the average £430 consumer electricity bill for 2010, only £16 was attributable to direct support for renewable energy. This assessment is in line with the latest evidence provided by both the Department of Energy and Climate Change and Ofgem, the gas and electricity regulator."
It seems to me that an over-reliance on gas, insufficient investment and planning by private companies in their "stockpiles" of gas make them hostage to the huge fluctuations in the price of energy commodities. Little to do with green policies, per se....