Big idea

Fix the Bottleneck

Scotland's wind is stuck behind the wires. Free it, and the waste ends.

Scotland generates far more clean wind power than the wires can carry south — so we pay the turbines to switch off, and burn gas instead. The fix isn't complicated: build the transmission that moves the power. It's already starting — but too slowly, while the waste piles up on our bills.

The bottleneck, in one picture

Scotland wasted more than 10 TWh of wind in 2025 (about £343 million); GB grid‑constraint costs reached roughly £1.5 billion — not because the wind farms fail, but because the transmission can't carry their power to where it's needed. The choke‑point has a name: the B6 boundary at the Scotland–England border, with more constraints across central Scotland. Wind generated north of these boundaries gets switched off whenever the wires below fill up.

You can see it on our own map: the farms paid to switch off sit right behind the grid bottlenecks. The problem isn't the wind — it's the wire.

The fix is already being built — just not fast enough

The real answer is more and better transmission, and it's under way as a set of HVDC "bootstraps" — subsea high‑voltage cables that carry Scottish wind south, bypassing the overloaded overhead lines:

• The Western HVDC Link (Hunterston–Deeside) is already operating.
• Eastern Green Link 2 (Peterhead–Drax) and Eastern Green Link 1 (Torness–Hawthorn Pit) are under construction, due around 2029 — EGL2 alone will carry enough power for roughly two million homes, and it lands closest to Moray's wind.
• Further links (EGL3, EGL4) are being planned and contracted.

But 2029 is years of wasted wind away, and the pipeline still lags the wind being built. Our argument is simple: treat this as the emergency it is — accelerate the grid upgrades, reform the planning and connection queue that slows them, and stop the meter running on curtailment in the meantime.

Build it to stay up — because availability is money

The biggest hidden cost in the grid isn't building it — it's faults, maintenance and downtime over an asset's life, and downtime isn't neutral. Research (UKERC) finds transmission unavailability — kit out for faults or maintenance — is a quiet but growing driver of curtailment: lines down in the north mean paying wind to switch off and burning gas in the south. Their striking figure: just 500 MW more usable capacity would have cut Britain's constraint costs by around 25% in 2024. So a conduit designed to stay up directly shrinks the waste bill.

Learning from where the water network struggled — leaks and endless maintenance — the Spine is designed for resilience and low lifetime cost:

• Undergrounded in the protected corridor — fewer weather faults and fewer accidental dig‑ins (the biggest cause of cable failures), and easy to inspect.
• Modern solid cable with nothing to leak, plus condition monitoring that predicts faults so they're fixed before they fail.
• Damage‑tolerant by design — a self‑healing outer jacket, and a network that automatically isolates a fault and reroutes power around it in seconds.

A British advantage — better cables

Whatever we build, the wires can be smarter. Graphene‑enhanced conductors carry more power with less loss — and this is a British strength. Graphene was first isolated at the University of Manchester (a UK discovery, Nobel Prize 2010), and Manchester's National Graphene Institute now helps lead a multi‑million‑pound international project on next‑generation cable technology for a greener grid, including the HVDC cables that carry offshore wind. Graphene‑coated copper is already in commercial specialist cables, and in the lab graphene composites reach roughly double the current‑carrying capacity of ordinary copper. A reason to build the fix here — and build it best.

Could the rail corridor help? (one option to study)

Here's a thought for an engineer's eye, not a headline: the safeguarded high‑speed‑rail corridor is one ready‑made north–south route. Rather than fight fresh planning battles for every line, could some transmission be co‑located along corridors we're already digging? It's speculative — the honest answer is "worth a feasibility study," not "the plan." The credible fix today is the HVDC links above, built faster; the corridor idea is a question for the people who build grids.

What we're honest about

• This is national infrastructure — our role is to make the argument, not to build it.
• The real, credible fix is the grid upgrades already under way (the HVDC links) — done faster and more resiliently. Co‑locating with the rail corridor is an interesting option to study, not our headline.
• Better conductors cut losses and lift capacity — but they are not lossless. No overclaiming.
• We're not grid engineers; we're the people pointing at the waste and asking that it be fixed with urgency.

The ask

Back and accelerate the grid upgrades that end the waste — and press for the planning and connection reform that speeds them up. If you can help — as an engineering or academic partner, an infrastructure or energy investor, or a policymaker — we'd like to hear from you.

Sources: 2025 Scottish wind‑curtailment and GB grid‑constraint cost reporting (~£343m / >10 TWh; ~£1.5 bn GB); UK HVDC "bootstraps" — Western HVDC Link (operating), Eastern Green Link 1 (Torness–Hawthorn Pit) & Eastern Green Link 2 (Peterhead–Drax), under construction, target ~2029, plus EGL3/4 planned (National Grid / SSEN Transmission); transmission unavailability as a driver of curtailment, and the "+500 MW usable capacity → ~25% lower 2024 constraint costs" estimate (UKERC); graphene research at the University of Manchester / National Graphene Institute; graphene–copper composites at roughly twice copper's current‑carrying capacity in lab research. Grid boundaries and cable routes on our map are schematic/indicative. Figures from public reporting, September 2026.