GB Grid Widens the Field. It Doesn't Shorten the Wait.

Pull the claim apart and only one part survives contact with reality. Britain has three companies legally allowed to build transmission infrastructure; GB Grid becomes a fourth, so “increase competition” is true by definition. “Drive down costs” is unproven, GB Grid’s £4 billion comes out of a Great British Energy pot that shrank from £8.3 billion after nuclear funding was redirected, money that would otherwise back renewables. “Speed up connections” is the one that doesn’t hold up: a fourth competitor doesn’t get a transformer built any faster, and it doesn’t train a single new engineer.

None of this is happening in a vacuum. UK data centres consumed 7.6 terawatt-hours of electricity in 2024, about 2 per cent of Britain’s total demand; NESO’s own forecasts expect that to reach as much as 11 per cent by 2035. That surge is a large part of why the connections queue went from 41GW to 125GW in under a year. NESO’s own Gate 2 reform has already cut the overall queue from 722GW down to a workable pipeline, and still cannot meet its 2027 deadline for 210 of the 340 projects it classed as “protected.” Nscale’s Loughton data centre, fully consented with Microsoft and Nvidia behind it, is now looking at a connection in the early to mid-2030s, not 2027, and is exploring Bloom Energy fuel cells as an interim power source in the meantime. If a project with that scale of financial backing cannot out-wait the queue, reform already tried to fix this, and it didn’t, fully.

That’s because the actual constraint isn’t ownership, it’s capacity. TRIG’s Minesh Shah put it bluntly: “The binding constraint isn’t capital. What’s scarce is the skilled workforce to build the grid capacity required.” The equipment side is just as tight, new grid transformers are quoted at up to five years from Tier 1 manufacturers like Hitachi Energy, Siemens Energy and GE Vernova, with 2027-28 order windows already closed. Hitachi Energy’s UK and Ireland head, Laura Fleming, points to the same global strain on supply chains built for a far flatter demand curve than today’s.

There’s a separate, unresolved question sitting underneath all of this. Ofgem is also consulting on a commitment fee meant to filter speculative data centre projects out of the queue, between £237,500 and £712,500 per megawatt, forfeited in full if a project drops out before connection. Nobody has yet explained how a self-built connection is meant to interact with that fee, or whether self-build will ever extend down to the smaller distribution-level connections where most solar and battery storage actually sits, rather than staying limited to the large data centre and industrial projects it currently targets.

Strip out the politics, and almost nobody, across the spectrum, argues GB Grid alone fixes this. Shadow Energy Secretary Andrew Bowie called it “Great British Gridlock,” arguing Labour’s own green levies are “what is holding back our energy system,” and that Conservatives would instead let businesses build their own gas and grid connections and bid openly for capacity. Industry voices want the skills pipeline fixed directly, more investment in training electrical trades and engineers, not a new institution. Growth campaigners at Britain Remade argue planning and consenting delays are the real constraint, pointing to offshore wind consents that take 12 years as the actual bottleneck. Energy policy analysts, including Lucy Shaw of the Centre on Global Energy Policy, have warned against building “another Frankenstein market,” where GB Grid, the three incumbents, and a wave of self-build developers all pull in different directions with no shared plan to coordinate them. Four genuinely different theories of what Britain should do next, and GB Grid is a partial, publicly-funded answer to only one of them. The other three, skills, planning, and coordination, are left largely untouched.

For a developer, three things matter now, not once the politics settles. Self-build at transmission scale isn’t actually available yet outside narrow cases, broadly, sites within 2km of existing transmission infrastructure; the real rules are expected in Ofgem’s autumn consultations, close to the 28 October Budget. Government is modelling the wider scheme on Ireland’s contestable connections system, where the developer designs, procures and builds the connection themselves to the network operator’s specification, the operator still controls connection method, protection and inspection, and the finished asset usually transfers to them for a nominal sum once adopted: control over timing, not a free asset at the end of it, and the developer typically covers the build cost plus the operator’s supervision and inspection charges on top. Separately, flexible connection agreements already exist today, accepting occasional curtailment at peak times can move a project up the queue right now, no new policy required and no waiting for Ofgem’s autumn consultation. Whatever route you’re on, the transformer and switchgear lead times above don’t change.

Where TMS Grid fits

Whichever route a project takes, the queue, a flexible connection, or self-build once it exists, the bottleneck is the same: procuring long-lead HV equipment early, designing the connection right the first time, and running delivery with the urgency the policy assumes exists. That’s the work TMS Grid does for developers every day. If you’re weighing up self-build, flexible connections, or what the Budget statement might mean for a live project, we’d be glad to talk it through.