BT is on track for an estimated £2bn-plus windfall over the next decade by stripping and selling copper cabling from Britain's legacy telephone network. The copper, once the backbone of UK broadband, is being retired as Openreach rolls out full-fibre connections to 30 million homes by decade's end. What was once a decommissioning cost has become a strategic commodity play, powered by the AI datacentre buildout and the broader electrification boom. The numbers are accelerating fast. BT recovered a record nearly 10,000 tonnes in the year to March 2026 — almost three times the prior year's haul and 63% above the 5,600 tonnes reported in its 2025 results. Total recovery since 2023 stands at 22,347 tonnes. Openreach estimates up to 200,000 tonnes remain in the ground, to be extracted through the 2030s as customers migrate to fibre. Copper prices have cooperated spectacularly. The metal hit a record closing price of $14,294 per metric tonne on Friday, nearly 70% above the ~$8,500 average when BT first began selling. S&P Global projects global copper demand will double from 25 million to 50 million metric tonnes by 2035, driven by AI infrastructure, electronics, and renewables. At current prices, BT's entire recoverable stockpile could be worth over £2bn, up from a prior estimate of £1.5bn. BT has structured the monetisation through forward sale agreements with EMR, the UK's largest cable granulation company. The second tranche — £99m upfront — landed recently, following £105m in 2024. Each agreement covers roughly 20,000 tonnes over four years, and crucially does not include any spot-market sales BT may make on top. The contract runs initially to 2028, though details remain undisclosed. The price surge has created a secondary problem: theft. Copper thieves have struck across Britain's telephone network, railways, and windfarms. In St Neots, Cambridgeshire, thieves hit twice in a single month, damaging nearly a mile of underground cable. In the New Forest, 128 premises lost connectivity; in County Tyrone, Northern Ireland, hundreds of homes and businesses were affected. Openreach deployed SelectaDNA — a synthetic DNA and UV tracer — across miles of cable, reporting a 30% drop in theft in 2024. But the technology cannot be applied retroactively to cables already underground, leaving a persistent vulnerability. The structural picture is clear: BT is converting a publicly-funded legacy network asset into a private commodity windfall. The copper network was built over decades with regulated returns and public subsidy. Now its physical residue generates billions in unregulated revenue at market prices. None of this is illegal or even unusual — but the value transfer is real. UK consumers and taxpayers funded the network that created the copper stockpile; BT shareholders capture the commodity upside. The AI boom has made copper one of the most strategic materials in the global economy, and BT happens to be sitting on one of the largest concentrated deposits in Europe — not in a mine, but under Britain's streets. The question for policymakers is whether a windfall of this scale, arising from infrastructure built under regulatory compact, should flow entirely to one corporate balance sheet.
