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Energy Bill [HL]

My Lords, in principle we are surely all in favour of this technology playing a part in our energy policy. It is simply practicalities that I want to ask the noble Lords, Lord Teverson or Lord Oxburgh, or the Minister about. First, we have been told by the Minister that the Government will not favour subsidies for developed technologies, but for developing technologies, such as offshore wind. We are told by the noble Lord, Lord Teverson, that this is a well developed technology. Does his proposal require some structural subsidy in the regulations he anticipates? It would be helpful to the Committee to know what financial arrangements are envisaged because there is no point in going into all this work if it is never to going to happen. Secondly, does the success of geothermal depend on some combination of electricity generation and community heating systems? Do you need to have both? If so, there has to be a big enough community near to the geothermal unit for that to be possible. I understand that Cornwall is geologically the best area in this country in which to exploit this technology, not the north-east. Thirdly, I understand that once a well has been drilled, the heat is gradually depleted in that locality under the surface. A typical geothermal station might operate for 20 or 25 years, which is a decent length of time for some purposes, but not if you are designing a heating system for a substantial urban area. Those are some practical questions on which either the mover of the amendment or, in due course, the Minister might want to comment.