Lord Lilley (Con)

My Lords, I want to use this as an opportunity simply to ask a question of the Minister. Why do we not take the advice of Professor Dieter Helm, in his review of energy policy, which was that instead of us providing the capacity mechanism centrally, we require anyone providing electricity into the system—wind generator, solar generator or whatever—from an intermittent source to provide firm power, in other words to pay for some capacity for the times when the wind is not blowing? If that were done, this whole arrangement would be unnecessary. We would have a much clearer idea of the total cost of intermittent energy if the supplier were also paying for some of the back-up capacity that is necessary to meet the occasions when intermittency prevents delivery of the power. The only argument I have heard against this is that, if you do it wind farm by wind farm, the aggregate amount of capacity would be statistically greater than is necessary to meet the fact that some wind farms will be producing when others are not, but that surely can be overcome by saying that a certain statistical proportion of the necessary capacity should attach to any intermittent generator. Then we would have a more rational, more credible and more manageable system than the one that we have under these regulations.