Explainer  ·  Issue 2  ·  Tuesday 9 June 2026

Watts Happening

 

The UK energy newsletter that doesn't work for the industry

The Spark

Nearly £1 billion. That's what National Grid's operational outperformance during the last five-year grid price control saved UK energy consumers — not through a government scheme, not through a regulator intervention, but through a transmission company running its infrastructure more efficiently than Ofgem's baseline assumptions.

It's worth sitting with that number. The grid is not a background utility cost that just ticks upward. When it's run well, it pays back. When it isn't, you foot the bill.

Which is exactly why the next five years matter more than most homeowners and commercial landlords realise. The RIIO-T3 framework — the new price control that governs what National Grid spends on transmission between now and 2031 — commits at least £70 billion into its regulated networks globally. That capital gets amortised through the standing charges on every electricity bill in the country. It is already baked in.

This Week in Watts

£31 billion into UK electricity transmission. Here's who benefits before the bill arrives.

The energy transition gets talked about as a green story. It isn't, or at least it shouldn't be — not if you're thinking clearly about where the money flows.

National Grid has just confirmed its RIIO-T3 investment framework: £31 billion into UK electricity transmission specifically by March 2031, part of a £70 billion group-wide commitment across its regulated networks in the UK and US. Total group assets are projected toward £115 billion. Nineteen gigawatts of additional demand capacity. Infrastructure to connect over 30 new data centres to the grid. And four government-designated AI Growth Zones, each targeting 500MW of AI-ready capacity by 2030.

This is the largest regulated infrastructure build in a generation. And here's the thing about regulated infrastructure spend at this scale: it doesn't land evenly. It concentrates. The capital flows toward specific nodes on the transmission network, and the land and commercial property near those nodes captures a disproportionate share of the value uplift before anyone officially announces the premium.

That's not speculation — it's how every major infrastructure build has worked. HS2 corridor land values moved years before a single track was laid. The same mechanism is in play here, except the signal is cleaner: National Grid has told the market exactly where the capacity is going. Not to the whole country. To thirty-odd specific connection points.

The four AI Growth Zones are where the concentration is sharpest. The government hasn't yet published the full statutory location breakdown — that comes via DESNZ, and we'll cover it the week it lands. But the framework is confirmed: four sites, 500MW each, grid infrastructure ringfenced under RIIO-T3. Data centre developers don't choose these sites for the scenery. They choose them because the power is guaranteed, the connection queue is managed, and the planning risk is reduced. Industrial land near a secured 500MW transmission node is a different asset class from industrial land that isn't.

What does this mean in practice? If you own commercial property — warehouses, out-of-town offices, industrial plots, strategic land — proximity to one of these nodes is becoming a material valuation factor. Not immediately, and not in a way that shows up on a standard RICS desktop valuation today. But in the same way that broadband infrastructure quietly repriced rural commercial property over a decade, grid capacity is starting to reprice land near high-voltage connection points.

The mechanism to watch is simple: data centre developers pay a premium for certainty. The certainty is the grid connection. The grid connection is the asset. Everything near it benefits from the spillover — construction supply chains, logistics, power-adjacent light industrial. You don't have to be building a data centre to capture the value; you just have to be close enough to one that is.

National Grid's own subsea interconnector fleet is already demonstrating the commercial logic: European cable availability rose above 90% this year, triggering £77 million returned to consumers under Ofgem's cap and floor regime — part of £354 million returned to customers over three years, with a further £313 million forecast over the next two, subject to Ofgem approval. Outperformance pays. The same principle will govern RIIO-T3: efficient capital deployment returns money to consumers; inefficient deployment adds permanently to standing charges.

The short version: £31 billion is being spent on UK electricity transmission whether you engage with it or not. The question is whether you're positioned anywhere near where it lands.

The DESNZ AI Growth Zone location announcement is the document to watch. When it publishes, the asset proximity map becomes legible. We'll cover it the week it drops.

The Bill Buster

How to audit your commercial portfolio for grid proximity — before the premium is priced in

This isn't about doing anything today. It's about knowing what you own before the market does.

National Grid publishes its transmission network on a publicly available network route maps page. Any landowner or commercial property holder can cross-reference their assets against existing high-voltage transmission infrastructure right now. No specialist knowledge required.

When the DESNZ AI Growth Zone locations are confirmed, overlay those against your portfolio. If you're within a credible industrial corridor of a designated zone, that proximity deserves a line in your next asset review — not as a speculative upside, but as a factor a sophisticated buyer will price in before you do.

→ Ask your agent: is grid capacity a factor in recent comparables here?

Watts on the Market

Sponsored slot  ·  Unsold this week

Watts Happening is an independent publication. This slot exists for organisations whose products or services genuinely serve this readership — energy finance, commercial property, grid-connected tech, or professional services for asset-owning businesses. If that's you, reply to this email.

Until then, something worth your time: the DESNZ AI Growth Zone statutory announcement is the document that turns this week's centrepiece from a framework into a map. Subscribe to DESNZ updates and you'll get it the day it lands.

→ Subscribe to DESNZ updates at gov.uk

Quick Watts

Interconnector returns

National Grid's European subsea cable fleet hit over 90% availability in FY2026, returning £77m to UK consumers under Ofgem's cap and floor regime. Total returns to customers over three years: £354m, with a further £313m forecast — subject to Ofgem approval.

(National Grid FY2026 Results, 14 May 2026)

Grid asset sales

National Grid sold its US renewables arm to Brookfield for £1.531 billion and offloaded Grain LNG to a Centrica-led consortium, generating a net £489m accounting gain on the LNG sale. The strategic direction is unambiguous: out of merchant generation, into regulated wires.

(National Grid FY2026 Results, 14 May 2026)

Vulnerable households

Priority Services Register activity across National Grid's UK electricity distribution network surged 168% this year, now covering 2.6 million accounts. The PSR identifies households needing additional support during outages — the scale of that jump reflects both better identification and a recognition that energy vulnerability is more widespread than previously recorded.

(National Grid FY2026 Results, 14 May 2026)

Fuel poverty

Network assistance programmes run by National Grid's electricity distribution arm saved 21,000 households a combined £22m — figures reported to March 2025.

(National Grid FY2026 Results, 14 May 2026)

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