The UK government has launched the Great British Grid (GBG) initiative aimed at improving electricity grid connections to support the country’s clean energy goals. The measure addresses a growing backlog of projects needing access to the electricity network, including both renewable energy developments and new data centres.

Until recently, grid connection requests were processed on a “first-come, first-served” basis, a system that contributed to a significant surge in applications over five years. According to National Grid Electricity System Operator (Neso), more than 700 gigawatts (GW) of projects are currently queued for connection—a figure that exceeds the estimated capacity required for achieving Britain’s clean energy targets by 2030 by approximately four times.

Neso has committed to clearing 300 GW of projects from this queue, removing those that are not sufficiently advanced or do not align with the government’s clean energy priorities. Meanwhile, the energy regulator Ofgem has also taken steps to discourage speculative data centre proposals, including a consultation on introducing commitment fees to filter out projects unlikely to progress.

The Great British Grid will compete with existing transmission companies through a “competitively appointed transmission owner” (CATO) framework introduced by the Energy Act 2023. This regime allows new entities to build infrastructure such as pylons and substations under competitive contracts, whereas previously only incumbent operators held such responsibilities. However, no contracts have yet been offered under the CATO model, and questions remain about the initiative’s capacity, given GBG’s initial funding of £4 billion over three years compared to Ofgem’s estimate of £70 billion needed for transmission upgrades over five years.

In addition, the government is considering permitting developers to construct their own grid connections, a move inspired by Ofgem’s evaluation of Ireland’s self-build connections program. This program reportedly shortened connection times by up to 11 months and reduced costs by approximately 20 percent over two decades.

While some observers see the GBG as a positive step toward enhancing state capacity, voices such as Mathew Lawrence, founder of the think tank Common Wealth, argue that the reforms do not go far enough and call for more extensive public ownership of energy infrastructure. Lawrence described the Great British Grid as a “good idea” that offers an opportunity to rebuild state involvement through practical experience.

For now, the launch of Great British Grid appears to have limited market impact, with shares in National Grid showing little change over the past week.