On 26 February, the UK’s first deep geothermal power plant began generating electricity in Cornwall after nearly twenty years of development. The United Downs project, led by Geothermal Engineering Ltd, drilled three miles into granite rock to access water heated to almost 200°C. The super-heated water will drive turbines, producing constant renewable electricity for up to 10,000 homes. Unlike wind or solar, geothermal provides continuous ‘always-on’ power. The site will also extract lithium from underground fluids, creating the UK’s first domestic commercial supply of this critical mineral used in electric vehicle batteries. While hailed as a major step for energy innovation, experts note that high upfront drilling costs may limit rapid expansion without sustained investment and supportive policy. Three more such projects are planned, reflecting growing interest in harnessing subterranean heat. Other countries are already doing this more widely; the Netherlands plan to have a quarter of their homes heated by geothermal by 2050.