The hon. Gentleman is absolutely right: the location of various wells would require either that the gas was stored in tanks near the well and then transported or that new pipelines be constructed to take it away. A pipeline could not be organised in the same way as for the North sea.
On the basis of the scenario I have outlined for what a shale gas industry would look like in this country, the estimates are that, in order to divert, let us say, 10% of our gas supply from conventional gas into shale gas and remove part of the need to have gas from Qatar or Russia—10% is a modest diversion—we would need to drill somewhere between 10,000 and 18,000 wells, and they would have to be re-drilled over a period. Of course, those wells would not be evenly distributed throughout the country—Members would not have around two wells per constituency; wells would be concentrated in the two areas of the UK where there are reasonable shale plays. Those shale plays are geologically faulted and difficult to get at; nevertheless, they are the main areas: Bowland shale in the north-east of England and across the weald in the south.
We are looking at 10,000 to 18,000 wells concentrated in two parts of the country. As the hon. Member for Thirsk and Malton said, that would probably result in the very intensive geographical concentration of fracking in those areas, with a substantial geographical concentration of take-off facilities and of the need to remove waste water, 7 million gallons of which per well will have to be removed and disposed of fairly safely as hazardous waste. We do not currently have the ability to do that in this country. We can do it for the occasional well, but we would not be able to do it very easily without substantial new facilities for such a concentration of hazardous waste, which would be repeated as the wells were re-fracked.
We need to ask whether all that is a realistic prospect compared with the gain that might come from extracting the additional gas. It seems to me that, if that is what we want for our energy strategy, there will be a very high price to pay throughout the country for a marginal gain. Are we really, seriously committing ourselves to that? Recent events in Lancashire demonstrate that it is rather difficult to get two wells into the ground, let alone 18,000 over a longer period. I am worried that we are setting ourselves up by assuming that some of our future energy supplies are going to be pencilled in for this particular route, when either there are unacceptable costs to reaching that goal or, to make the industry work, we will have to build a whole lot of infrastructure on the back of what we already have.
Having looked at how a UK shale gas industry might look, it might be interesting to look briefly at an alternative industry: green gas, which is the production of gas by anaerobic digestion plants and associated methods. It has been projected that, by using most of the available feedstock that could go into anaerobic digestion plants, we could probably divert between 5% and 10% of our domestic gas supply requirements. When I say divert, I mean literally divert, because green gas AD plants can now inject gas directly into the mains.
There are eight green gas plants currently operating in the UK. I recently visited one in Poundbury, which, at certain times of the year, injects gas into the mains grid. People living between, roughly speaking, Lyndhurst and Weymouth will receive green gas from the Poundbury anaerobic digestion plant at various times of the year. There is direct substitution of the existing gas going into the mains. An AD plant would probably produce some 6 million cubic metres over 20 years. A well could produce rather more at some 20 million cubic metres, but it would have to be re-fracked several times. After that, the well would be capped and the operators would walk away. Because plants and animals continue to produce feedstock, AD green gas plants would simply continue. If we are considering changing from gas imports to domestic production for national security purposes, it might be a better idea to build a large number of AD plants and have one at the end of every lane.