UK Grid Congestion Forces Data Centers to Build Gas Plants Before Grid Connection

UK Grid Congestion Forces Data Centers to Build Gas Plants Before Grid Connection

TREE NEWS reports: Data center developers in the United Kingdom are increasingly turning to self-built gas-fired power stations as a stopgap measure to get projects operational, as grid connection backlogs stretch well into the next decade. The number of large data center projects consulting National Gas on gas pipeline connection options has surged from five last year to 24 currently. The UK government responded last week by proposing to allow strategically important data centers to temporarily use gas-fired generation while committing to future grid connection, alongside a new “contract” mechanism for data centers where emissions would be accounted for at the national level rather than requiring individual plants to meet standalone standards.

The Grid Bottleneck

The UK’s grid connection queue has become a well-documented bottleneck, driven by planning permissions, regulatory processes, construction costs, and labor shortages. Some developers have decided to bypass the grid entirely and build gas plants to launch projects sooner. Quest Park, a data center campus in Bedfordshire led by property developer David Kohler, plans a 720-megawatt capacity that could become one of the UK’s largest data centers. However, its grid connection slot is not available until 2034. With a high-pressure gas pipeline passing nearby, the developer plans to build a gas plant first to power the initial smaller-scale phase. The £3 billion SDC M40 Campus in Buckinghamshire and a proposed data center in Cardiff by Curtis Hall are also considering gas generation as a transitional solution until formal grid access is granted.

Alan Fotheringham, director of low-carbon global market solutions at Jacobs, noted: “The path to gas generation is much shorter than the path to obtaining permanent grid access capacity.” He added that options such as biomethane, carbon capture, and hydrogen could be introduced at projects like Quest Park in the future.

Gas Demand Could Surge

The potential scale of additional gas generation is significant. Marten Ford, an analyst at Aurora Energy Research, estimates that if data center construction accelerates and renewable energy growth fails to exceed existing plans, UK gas-fired generation output could increase by 40 terawatt-hours by 2035—equivalent to 44% of last year’s national gas-fired generation. “Without broader measures, large-scale deployment of data centers will drive up natural gas usage and increase carbon emissions,” Ford said. Notably, Aurora’s estimate already assumes most proposed projects are speculative and will not materialize; if all were built, the increase in gas demand would be even more pronounced.

Tom Edwards, an analyst at Cornwall Insight, also pointed out that existing gas plants will need to run more frequently regardless of construction scale. Even if data centers successfully connect to the national grid, the electricity used will come from a mix of UK renewables, nuclear, and natural gas, which will also drive gas demand to some extent.

Low-Carbon Paths Exist, but Obstacles Are Real

The industry is not without alternatives; the debate is about feasibility. Greg Jackson, CEO of Octopus Energy, the UK’s largest oil, gas, and electricity retailer, called the notion that only gas and nuclear can meet data center demand “nonsense,” suggesting data centers be relocated to Scotland to leverage abundant wind resources. However, the UK’s current electricity market mechanisms lack sufficient incentives—many developers prefer locations around London to be close to customer demand. For developers building their own power sources, wind, solar, fuel cells, and small modular reactors (SMRs) are low-carbon options, but SMRs are still years away from commercial deployment. Sam Nicole, director of the energy team at Savills, said: “We are exploring a wide range of project options.”

Drax, owner of the Wood coal plant, is taking a different approach, planning to develop a data center at its Yorkshire biomass plant site, which supplies about 5% of UK electricity. Natascha Hospedales, AI affairs lead at environmental law charity ClientEarth, criticized the government’s latest proposal, arguing it would create a “strong presumption in favor of data center construction without establishing equally strong environmental restrictions.” Ford of Aurora Energy Research also mentioned Ireland’s approach as a reference—new rules there require 80% of data center electricity to come from renewable sources.

Actual Deployment Scale Remains Highly Uncertain

Despite strong demand signals, there is considerable uncertainty about how many data center projects will ultimately be built. Consultants estimate that the total capacity of data center projects currently queued for grid connection is as high as 73 gigawatts, but only 10% to 20% will ultimately materialize. Katie Berriman-Davies, energy and infrastructure policy head at tech industry group Tech UK, said that for most developers, the priority remains actively participating in the grid demand connection reform process to push for policy improvements and faster access. The gas generation route is more of a realistic transition under long-term grid capacity constraints rather than an active industry transformation.

Market Implications

This development has several market implications. For UK natural gas prices, increased gas-fired generation demand could provide support, particularly during peak periods. For the UK’s carbon reduction targets, the trend poses significant challenges, potentially requiring policy adjustments or carbon offset mechanisms. For data center operators and technology companies, energy costs and timelines become critical factors affecting investment decisions. For renewable energy developers, the situation underscores the need for faster grid connection processes and better energy storage solutions. For investors in UK utilities and energy infrastructure, the shift toward self-generation could create opportunities in distributed generation and energy management services.

Key Takeaways for Investors

• UK grid connection delays are forcing data centers to adopt gas-fired generation, potentially increasing natural gas demand by up to 40 TWh by 2035—bullish for UK gas prices.
• The trend poses risks to UK carbon reduction targets, which could lead to tighter regulations or carbon pricing mechanisms affecting energy-intensive industries.
• Data center developers face higher capital costs and environmental scrutiny, but self-generation offers faster time-to-market—a trade-off that may favor large, well-capitalized players.
• Renewable energy and energy storage solutions could benefit from policy responses aimed at accelerating grid connections and reducing reliance on gas.
• Investors should monitor UK government policy developments, particularly the proposed “contract” mechanism and emissions accounting rules, which could reshape the economics of data center power supply.