Geothermal Heat and Power

Lord Berkeley Excerpts

Thursday 6th July 2023 Grand Committee

[Lord Berkeley (Lab)]

My Lords, it gives me great pleasure to follow the noble Lord, Lord Lucas, and I am grateful for the opportunity that the noble Lord, Lord Cameron of Dillington, has provided for this debate.

My civil engineering days are decades past but I did a lot of rock drilling in my youth. Technology has moved on, but even in those days it was quite simple and straightforward. Of course, the geology varied. Looking at the application to the production of energy that we are talking about today, it has one thing in common: there is a plentiful supply of drills, drilling and expertise—there is plenty of water underground. It could eventually be cheap, and of course it is safe; it is nothing like fracking, which people get worried about. It is all to do with water. I appreciate that the capital cost to start with is high, as other noble Lords have said, and some of the drills may be noisy, but on the other hand, you do not need much space, the technology is well proven, and as we move forward and get a plentiful supply, the costs will come down.

The other interesting thing that many people forget is that the temperature of the water that comes out can vary dramatically. I think that at Eden, which the noble Lord, Lord Cameron, mentioned, it is 85 degrees centigrade, which is pretty hot—plenty hot enough—but even lower temperatures not so far down are hot enough for many purposes. I live in Cornwall and in the Isles of Scilly and I have been to see this project in Eden. The drill was, frankly, enormous, very impressive and fast, and it is now working. The noble Lord, Lord Cameron, mentioned Redruth; the first one was in fact in Penzance. Noble Lords may know that there is a rather interesting open-air swimming pool next to the sea, part of which is heated with geothermal water, and there is a queue of people to go to it. There is not as much water as there might have been because they are experimenting with air-drive and water-drive drills, but it works, people like it, and it is available.

We spend a lot of time in your Lordships’ House talking about storage—hydroelectric is one solution, and underground gas storage another—but this stuff does not need storage. You just switch it on and off; it is a pump. There are an awful lot of benefits here. The fact that it can provide 40% of the UK’s energy consumption means that we really need to take this more seriously. It can be used in many parts of the country. Cornwall is probably the best, because the water is hottest, but it is worth looking at many other places and—as I think the noble Lord, Lord Cameron, said—doing a proper mapping of this country from a geological point of view.

This is a way forward for many of our energy needs. I would just like to reflect on the fact that many communities in this country say, “Let’s have a series of windmills to give us electricity for the community”, or “Let’s have a solar farm and get cheap electricity”. You could just as easily have one or two of these geothermal wells to give you hot water, and that is all you need to keep your homes warm and to get a hot bath or shower. Before noble Lords say, “That’s not very much”, that is 40% of our energy requirements. I hope the Minister will find a way forward so that we can all benefit from this.