Geothermal Energy

Perran Moon Excerpts

Thursday 6th March 2025 Commons Chamber

[Dr Mullan]

I fully support the hon. Member�s efforts to raise this issue. She will know from the local projects in her constituency that we are making a start, but it is not enough, and this needs to be part of the broader plan in a comprehensive way.

When I first learned about deep geothermal technology, I thought it sounded too good to be true: an environmentally friendly, reliable and cost-effective source of heat and power right underneath our feet. But the more I explored it, the more I realised it truly lives up to its promise. Let me briefly explain the technology. Deep geothermal taps into naturally occurring hot water deep underground to produce significant amounts of usable heat and energy. Making use of that is no different from the way in which the Romans built their baths above hot springs; we just run a pipe down instead of relying on the water making its own way to the surface. People sometimes wonder whether the technology is fracking mark 2. Fracking involves the use of high pressure to crack the rocks to create artificial flows. Like Europe, we have access to resources of naturally flowing water that simply need to be tapped.

Greenpeace, Friends of the Earth and the United Nations all support deep geothermal in the light of its environmental benefits. A site is typically 1 to 2 acres. It does not take up huge swathes of farmland like solar panels can or involve erecting wind turbines, which some communities think detract from the local landscape.

[Perran Moon (Camborne and Redruth) (Lab)]

I thank the hon. Member for giving us the opportunity to discuss the potential of geothermal and the barriers when it comes to planning. In my constituency of Camborne, Redruth and Hayle, we have businesses that are at the forefront of both shallow geothermal energy, with ground source heat pumps developed by Kensa, and deep geothermal systems such as those being pioneered by the Geothermal Engineering Ltd deep geothermal power project, which is soon to become operational. Does he agree that industry needs Government support, including planning reform to reduce deployment timescales, and a UK geothermal licensing scheme to calculate the size of the geothermal asset and how that asset is protected in law?

[Dr Mullan]

I agree with the hon. Member. The Government need an entire strategy for deep geothermal that will hopefully draw attention to those different pieces of the puzzle, including planning and licensing, which are so important. Not too far away from his constituency is the Eden Project, which people see as a byword for environmental credentials in this country. It is pioneering this technology, which is a powerful testimony to its environmental benefits.

Since the closure of the non-domestic renewable heat incentive in 2021�unfortunately just as interest was peaking from industry�deep geothermal, unlike solar and wind in their early beginnings, has been without comprehensive Government support to develop the market. There have been encouraging breakthroughs, as was mentioned, and in 2023 the UK�s first operational deep geothermal plant to open in 37 years went online at the Eden Project. Deep geothermal also made its historic debut in allocation round 5 of contracts for difference, with three projects from Geothermal Engineering Ltd securing approval, totalling 12 MW of capacity. At Langarth garden village, green heat network funding is now supporting the development of a geothermal-powered heat network to turn that resource into local supply. Those successes show that, with the right backing, geothermal can become a key player in our transition to clean, sustainable energy.

However, those ad hoc wins are not providing the sort of comprehensive dedicated approach that we need. As it stands, the UK has fallen far behind other countries that have for some time harnessed the potential of deep geothermal. If we look across Europe, as of 2022 there were 74 projects in France, 31 in the Netherlands, and 190 in Germany. Deep geothermal energy heats more than a quarter of a million homes in Paris, and the French Government aim to increase the number of schemes by 40% by 2030. Munich is pouring in �1 billion through to 2035 to develop deep geothermal and make the city�s heating carbon neutral. In fact, Germany is already producing more than 350 MW annually, and the Government are targeting at least 100 new geothermal projects. Across Europe alone, hot sedimentary aquifers have the potential to provide eight terawatts of heat at 90� C�30 times more than the district heating systems that currently serve 70 million people across the region. The potential is enormous.