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Energy Bill [HL]

My Lords, that is a difficult question to answer at the moment; we would be in a better position to answer it after the Cornish exploration has gone ahead. The fact is that this work was killed around about 25 years ago, as the noble Lord, Lord Teverson, said, by the crash of the oil price and by the DTI, as it was then, simply being no longer interested in supporting this work. Until that time, we had very good support from the DTI. In fact, the one geothermal source in this country that is functioning at the moment, which is the one around Southampton, was the outcome of the PhD work of one of my students at the time. Since that time, drilling and fracturing technology has improved enormously. The oil companies have developed that to a very fine art. One can now drill, with control of the drill tip, to about the same precision as a brain surgeon uses when operating on a brain. It can be a very fine control indeed. We really have to see how successful this is at exploiting these resources, which have been known about for quite a long time. It is very simple to tell the noble Lord how many gigawatts of energy could in principle be removed, but that is a meaningless figure until we have some feeling about how effective the new technology is going to be. I would not want to say at this stage that this will save our renewables targets. At the moment, I would say there is a good chance that it will amount to good housekeeping but it may be considerably more than that.