A new report from the British Geological Survey has confirmed that geothermal energy, long dismissed as economically unviable, is more abundant than previously thought. The UK, with its complex geology, is now positioning itself as a global leader in extracting heat from the Earth's crust. However, the upfront costs remain astronomical, and the technology is still in its infancy. This is not a silver bullet for the energy transition, but it could be a crucial component of a diversified clean energy portfolio.
Geothermal energy works by drilling deep into the Earth to access hot rocks and water. The heat is used to generate steam, which drives turbines to produce electricity. Unlike wind and solar, it provides baseload power, meaning it can run 24/7 regardless of weather. The UK has a number of potential sites, particularly in Cornwall, where hot granite lies relatively close to the surface. The government has pledged £20 million to support a new geothermal plant in Cornwall, and private investment is flowing in.
But the costs are sobering. A single geothermal plant can cost over £100 million to develop, and the risk of drilling dry holes is high. The technology is still largely unproven at scale in the UK. Yet the potential rewards are immense. The Earth’s heat is essentially infinite. The question is whether we can tap it economically before the climate crisis renders the point moot.
There is a calm urgency here. The climate does not wait for technology to mature. But we cannot afford to ignore any option. Geothermal is not a panacea, but it could provide a significant share of our energy needs in the coming decades. The UK is taking a calculated risk. It is a bet that could pay off handsomely, or it could be a costly lesson. Either way, it represents a genuine attempt to solve the energy puzzle.
