Geothermal Energy

Alan Whitehead Excerpts

Tuesday 19th June 2018 Westminster Hall

[Dr Alan Whitehead (Southampton, Test) (Lab)]

I congratulate my hon. Friend the Member for Bishop Auckland (Helen Goodman) on securing this important debate and on putting her case with such clarity and precision. After what she found out about geothermal during her research for this debate, I am sure she will agree with me that it is indeed Britain’s forgotten renewable. It is not forgotten because it is not feasible or because it does not bring tremendous benefits. It is forgotten simply because no one has done much about it, even though that resource is under our feet in many parts of the country and is relatively easy to access. When that resource is accessed and developed, it provides potential free heat and power, probably for 100 to 150 years, as a result of a single borehole drilled down into the ground to unleash it.

Why it should be forgotten is a source of puzzlement to me, because it is a universal and beneficial renewable. Some people may regard deep geothermal as not quite renewable, in that if there is drilling into a deep geothermal aquifer, the aquifer, in theory, depletes over time. However, if water is being raised from the aquifer at the typical temperature level in the UK of about 73° or 74° Celsius, that resource will deplete at only 1° in heat per 100 years. Yes, it depletes a bit, but it is not exactly calamitous—unlike, one might say, drilling a fracking well, where the well depletes after about eight years.

[The Minister for Energy and Clean Growth (Claire Perry)]

Such a fact-free debate.

[Dr Whitehead]

No, it is a very factual debate—that is the difference.

The geothermal potential of the country is enormous, and the hon. Member for Falkirk (John Mc Nally) set out what the potential would be, in electricity and heat, for the UK were we to proceed seriously with geothermal energy. Perhaps a limiting factor is the fact that geothermal energy is not available everywhere in the country. We need to be clear about the fact that deep geothermal is available on the basis of three different kinds of site. Basins with very ancient water at the bottom are one kind of site. Another kind, which require slightly different technology, are areas with radiothermal granite batholiths. I believe that the Minister, as a first-rate geographer in her time, will know all about batholiths and lopoliths and various other things. We have quite a lot of radiothermal batholiths in the UK, with naturally occurring radioactive-based heat coming from deep within the earth’s crust. Another kind of site relies on the availability of technology to release heat by putting water down one pipe and up another, giving geothermal as a result.

As my hon. Friend the Member for Bishop Auckland mentioned, lower-temperature geothermal resources arise from abandoned mine workings. With heat-concentration techniques that is not a problem, in terms of concentrating the heat to get into production either for heat distribution or, indeed, for making steam to generate electricity.

As hon. Members have kindly mentioned, I have an interest in the debate because I think I can claim to be the only sitting Member of Parliament who has directly set up a geothermal energy scheme. I know a little, therefore, about how it all works. That scheme is based, as has been mentioned, in the middle of Southampton in a not particularly prepossessing shed, with a small wellhead in the carpark of the former Toys R Us store. That unprepossessing setting hides a well, drilled to about 1,800 metres. Water comes up at just over 70° Celsius and is converted into the material for a district heating scheme by a heat exchanger and concentrator. Now Southampton has a city centre district heating scheme with some 17 km of pipes, covering the university, the civic centre, the country’s only geothermally heated hypermarket and a five-star hotel. In other words, there is a complete city centre arrangement, heated substantially by geothermal energy. Not only that, but it has been heated in that way on an untroubled basis since 1987, and will continue to be so until 2087 on present estimates of what may be available. That is the potential, in practice, for geothermal energy.

[Dr Dan Poulter (Central Suffolk and North Ipswich) (Con)]

The hon. Gentleman speaks with great knowledge, and I pay tribute to his work promoting geothermal power in his constituency. What are his thoughts on the potential for geothermal power in more rural areas, where there is great reliance on oil central heating, often at great cost and with a high carbon footprint? Does he believe that more could be done to incentivise and encourage developers in rural areas to look at geothermal power for new developments and homes?

[Dr Whitehead]

I have to tell the hon. Gentleman that he is the only Member present for the debate who does not have a geothermal resource under his constituency. I have mentioned the different types of geothermal resource, and the large Mesozoic basins are in East Yorkshire and Lincolnshire, around the whole Wessex area, in Southampton and Worcester, and in Cheshire. The radiothermal batholiths are in the eastern highlands, across the north-east and north-west of England, and in Cornwall. The hon. Member for Strangford (Jim Shannon) will be delighted to know that about half of Northern Ireland is covered by two Mesozoic basins, giving most areas a strong resource.

The problem is, first, that that resource is not available everywhere and, secondly, that because of the capital cost of the borehole, geothermal energy is probably best suited to larger district schemes. One of the key issues is that because of the immediate availability of the resource, if an area—particularly a rural area—is capable of receiving it, it can be used for relatively small district heating schemes, or for local plant producing electricity in the area with a combination of a relatively small heat take-off. There is considerable potential, but I am sorry to tell the hon. Member for Central Suffolk and North Ipswich (Dr Poulter) that drilling under his constituency at the moment would be fruitless, as far as I am aware. However, it is possible to do it in some rural constituencies where the resource is more available.

[Dr Poulter]

A number of new, larger homes—particularly barn conversions, which are very popular in Suffolk—have invested in the technology as a means of heating. My question is more about how we can do more to incentivise developers on small-scale developments, perhaps on the edge of rural villages and towns, to look at similar schemes, and what suggestions the hon. Gentleman may have to bring forward those incentives.

[Dr Whitehead]

I think that the hon. Gentleman is referring to vertical hole shallow geothermal ground source heat installations. They are perfect for rural homes, as he described. They will provide sufficient heat, from a relatively shallow penetration into the earth, for heat exchangers to heat a home to a regular temperature of 60°-plus. Although I do not think that that is an essential part of this afternoon’s debate—it is more to do with ground source heat pumps—the hon. Gentleman is right. It is a technology that I would strongly recommend for off-grid properties in which, in the past, the alternative heating might have been oil. It can absolutely reliably replace that form of heating. I join the hon. Gentleman in recommending to the Minister and the Government that efforts to secure the installation of ground source heat pumps for off-grid properties in rural areas would bear considerable fruit and ought to be strongly supported—rather more strongly supported, I suggest, under the renewable heat initiative than is currently the case.

I hope that I have set out the potential for geothermal energy, and stated how it can be done in practice and what its benefits are. I was leader of Southampton City Council at the time that the scheme I described was initiated, but provided that it had the resource, almost any local authority in the country could pilot and undertake such a scheme relatively easily. The main issue is how to raise the initial capital funding up front to get the scheme under way.

Let me say one or two words about what the Government ought to be doing—in addition to the constructive and sensible suggestions made by my hon. Friend the Member for Bishop Auckland—to start using this resource. Capital grants will be required up front for the essential drilling of the well. The Government have underwritten several such schemes in various parts of the country to the tune of about £2 million a time, and we should extend the availability of those initial grants. Currently, the money available through the non-domestic renewable heat incentive is not sufficient to get those schemes under way from a capital point of view. As far as deep geothermal is concerned, the RHI currently provides 5.38p per kWh. That does not compare favourably with funding for ground source heat pumps, which comes out at 9.36p.

At the moment, the incentives to get such a scheme going properly in any area are not sufficient. That is particularly unfortunate; geothermal energy ought to be considered a different form of renewable energy, because of its known longevity. When we invest in a geothermal energy plant, we are investing in a capacity that will give us free energy for 120 years—we cannot say that about pretty much any other renewable energy source, except possibly the Swansea tidal lagoon. I therefore think that the criteria under which geothermal energy is considered should be based on that kind of payback and that kind of timeframe.

[Helen Goodman]

My hon. Friend tempts me down a path that will be familiar to many colleagues. His point raises the question of whether it is appropriate to use the same Treasury discount rate for something that is so long-run as we would for a project that would last for 25 years. That would be another way of squaring the circle.

[Dr Whitehead]

My hon. Friend makes an interesting point—that might be her seventh recommendation for the Minister this afternoon.

In conclusion, all hon. Members who have contributed to this debate have made clear their support for the potential of this form of renewable energy, and they have given examples from various parts of the UK. I particularly applaud the Scottish Government’s initiative to bring forward real funding for geothermal schemes, and I hope that in the not-too-distant future Southampton will no longer be the only geothermal plant in the entire United Kingdom that operates in the way I described. There are glimpses of progress here and there, but it is by no means continuous or anywhere near to fulfilling the enormous potential that geothermal energy offers.

My request and suggestion to the Minister is that she might like to come to Southampton and have a look at the little wellhead in the Toys R Us carpark and the shed in which the scheme is housed, so that she can see for herself just how much comes from that little site, how much good it has done for a whole community and city, and how much good it will do for many years to come. We should consider geothermal energy in that way, and if we do, we will go a long way towards understanding how good it could be for the UK. I hope that we will then put our resources where our hopes are and ensure that geothermal energy has a bright future in the UK, just as it already does in other countries.

The hon. Member for Falkirk said that 66% of Iceland’s overall energy requirements come from geothermal energy. Indeed, a project called IceLink is currently considering the possibility of an interconnector between Iceland and the UK, in partnership with National Grid and Landsvirkjun, the state-owned generator in Iceland. That is a real possibility for the future. We could be in the position of having home-grown geothermal energy and bringing into the country someone else’s geothermal energy to complement that, so that together we would have a completely carbon-free source of energy that would last the UK for a century. I think that is a prize to be worked for.