National Grid to Invest £400M, Extend IFA Link to 2050

National Grid said on October 29 that it plans to invest up to £400 million (roughly $531 million) to keep the IFA interconnector — Britain’s original subsea power link to France — running until at least 2050. The investment will go toward upgrading the technical equipment, buildings and facilities at the 2 GW link’s converter stations rather than laying new subsea cable, extending the working life of infrastructure that has been moving electricity between the two countries since 1986.

IFA, short for Interconnexion France-Angleterre, is jointly owned by National Grid and French grid operator RTE and remains one of Britain’s highest-capacity electricity links to continental Europe, carrying enough power for roughly 3 million British homes a year. Rebecca Sedler, president of NGV UK at National Grid, said the investment would extend the link to “meet the next phase of electricity demand, from AI to electric vehicles,” and said IFA alone has delivered close to £300 million in payments to UK consumers since 2020.

A 40-Year-Old Cable Built for a Different Grid

IFA was commissioned nearly four decades ago, long before Great Britain’s electricity system had to absorb large volumes of wind and solar generation or plan around electrifying transport and heating. For most of its life, power has flowed predominantly from France to Great Britain, reflecting France’s large nuclear baseload. But the link runs both ways: in 2022, Great Britain exported power to France to help cover outages across the French nuclear fleet, and the interconnector regularly carries flows in either direction on the intraday market as the two countries’ demand and generation patterns diverge hour to hour.

That flexibility is central to National Grid’s case for the investment. The company argues that keeping access to French nuclear generation — typically cheaper than British wholesale power at times of high demand — helps lower costs for UK consumers, while also giving Great Britain’s grid operators another tool for exporting surplus renewable output when it would otherwise be curtailed.

Part of a Wider Push to Keep Britain’s Interconnector Fleet Running

The UK now has close to a dozen electricity interconnectors linking it to northwest Europe, part of a fleet that National Grid says has delivered roughly £2 billion ($2.66 billion) in net benefits to British consumers since 2023 compared with relying on gas-fired generation alone. The IFA investment sits inside a much larger capital programme: National Grid has said it plans to invest at least £70 billion ($93 billion) across the group over the five years to March 2031, covering everything from onshore and offshore grid reinforcement to the interconnector upgrades announced this week.

RTE’s share of the spending on IFA was not disclosed. The investment comes as Great Britain’s grid faces rising demand from data centres and electric vehicle charging even as it adds more weather-dependent renewable capacity — a combination that has pushed National Grid to approve nearly 2 GW of battery-backed solar farms in a single month earlier in October, alongside the IFA life extension.

Why Cross-Channel Capacity Still Matters

France’s own nuclear fleet, the generation source IFA most often carries toward Great Britain, has been going through its own slow renewal: EDF has been working through steam generator replacements at ageing plants, including a project at the Cruas plant that received three new steam generators from Mitsubishi Heavy Industries earlier this month. Keeping a well-maintained physical link between the two systems gives both sides more room to manage outages, seasonal demand swings and the uneven arrival of new nuclear and renewable capacity on each side of the Channel — which is ultimately the argument National Grid and RTE are making in committing new money to a 40-year-old cable rather than waiting for it to need replacing outright.

Sources

• Oilprice.com, “UK National Grid to Extend France Power Link Operation to 2050,” October 29, 2026 — original report with Rebecca Sedler’s quotes and investment details.
• Offshore Energy (offshore-energy.biz), “Huge investment to keep first UK-France interconnector running until at least 2050,” October 29, 2026 — independent confirmation of the £400 million figure and 2 GW capacity.
• Reuters, cited via Marketscreener, “National Grid plc Plans Up to GBP400 Million Investment in UK-France Electricity Interconnector,” October 29, 2026 — independent confirmation of the investment figure in dollar terms.

Illustrative image. Photo: Frans Berkelaar, CC BY 2.0, via Wikimedia Commons — source