The United Kingdom Geological Survey has published data confirming that geothermal energy resources beneath the North Sea are abundant enough to supply the nation's electricity demand for centuries. But the report carries a sobering caveat: accessing them remains prohibitively expensive.
Dr. Helena Vance, Science and Climate Correspondent, reports that the survey identifies an estimated 100 gigawatts of recoverable heat from deep granite formations beneath the seabed. This is roughly twice the UK's current electricity generation capacity. The energy is there waiting for the right technology and economic framework.
“We have mapped a massive thermal resource,” said Dr. Adrian Morris, lead author of the survey. “The question is not geology, but engineering and investment.”
Current drilling costs for geothermal wells in the North Sea range from £15 million to £25 million per well, with multiple wells needed for a viable plant. At present, this makes electricity from geothermal about three times more expensive than offshore wind. But wind is intermittent; geothermal provides constant baseload power, a crucial advantage in a decarbonised grid.
The report suggests that with advancements in drilling technology and economies of scale, costs could fall by 40% within a decade. It also highlights the potential for using depleted oil and gas reservoirs as heat stores or for direct heating in nearby coastal communities.
“We are sitting on a geological battery,” said Dr. Vance. “But we have to build the charging cable.”
The survey has sparked interest from companies like BP and Shell, who already have infrastructure in the North Sea and are looking for diversification. However, without government subsidies or carbon pricing signals, the financial case remains marginal.
Environmental groups have cautiously welcomed the report but stress that geothermal must not delay the rapid expansion of renewable energy. “The biosphere is collapsing now,” said Dr. Vance. “We need all the tools, but we need them fast. Geothermal's high cost means it cannot be the lead horse in this race.”
Still, for a nation facing energy security concerns and net-zero targets, the report provides a clear roadmap. The technology is proven in Iceland, the Philippines, and parts of the United States. The challenge is adapting it to the high-pressure, high-temperature environment of the North Sea.
The survey recommends a pilot project costing £200 million to demonstrate commercial viability at scale. That sum is small relative to the potential prize, but in a period of fiscal austerity, it remains uncertain.
Dr. Vance concluded: “We are in a calm urgency phase. The science is clear, the resource is immense. The only variable is whether we choose to invest now or pay the climate cost later.”
