Why the new data centres threaten UK climate targets
Two planned data centres, at Wapseys Wood in Buckinghamshire and Quest Park in Bedfordshire, are projected to emit more than 4.5 million tonnes of CO₂ a year once fully operational, according to analysis by the campaign group Foxglove reported in the Guardian. For comparison, it is roughly the annual driving of 3.6 million petrol cars, at 202g of CO₂ per mile and the average petrol car’s 6,200 miles a year.
The detail the coverage skims past
Neither site can wait for a grid connection, so both propose their own on-site gas-fired power stations. Wapseys Wood’s planning documents describe data halls drawing around 300 megawatts alongside a gas energy centre of up to 350 megawatts more. This is not a story about computing drawing on a carbon-heavy grid. It is new fossil fuel generation, built specifically to power computing, in 2026.
The easy response for business leaders is to treat this as somebody else’s scandal. Point at the hyperscalers, sign the petition, move on.
Demand is not an abstraction
That response misses where the leverage is. Data centres are not built for fun. They are built to meet demand, and demand is not an abstraction. It is every page loaded, every asset shipped, every auto-playing video, every tracking script, every gigabyte your digital estate sends to a customer who needed a fraction of it. If your website is heavier than it needs to be, a sliver of that 1.3 gigawatts is being built for you.
Honesty about scale matters here, because this subject attracts inflated claims. Under the Sustainable Web Design Model, the current version of the most widely used methodology for estimating web emissions, data centres account for roughly a fifth of the web’s energy footprint. Most of the rest is the networks that carry the data and the devices that receive it. But all three segments are driven by the same input: how much data gets shipped. Cut the megabytes and every part of the chain works less.
The question that actually matters
Which is why the practical question for a senior leader is not “how do I feel about Buckinghamshire?” It is “what does my own estate weigh, and has anyone ever measured it?”
In my experience, almost nobody has. Businesses that can quote their fleet mileage to the litre have no idea what their homepage weighs, how much of it does nothing, or what it costs them. And this is the rare corner of climate strategy with no trade-off attached: a lighter website loads faster, ranks better, converts more and emits less. The same decision produces all four outcomes. You do not need to care about the carbon to want the other three.
What to do, practically
- Measure before you pledge. Get your digital estate weighed: page weight, requests, emissions per page view. We do this as a free website carbon audit, and other agencies offer similar services. Whoever does it, the result is the same: vague scope 3 anxiety becomes a number you can manage, in an afternoon.
- Make weight a procurement question. When you commission digital work, ask what the deliverable will weigh and how that will be evidenced. Any competent supplier can answer. The silence from those who cannot is informative.
- Read hosting claims carefully. “Green hosting” changes where a server’s electricity comes from. It does not change how much data your pages send, which is what most of the estimate is built from. A renewable badge on a bloated site is a clean label on a heavy product.
- Expect the reporting net to tighten. The Competition and Markets Authority already has direct enforcement powers over environmental claims, and scrutiny of digital infrastructure is growing on every front, from parliamentary committees to planning inquiries. Numbers you can evidence will age better than pledges you cannot.
Digital is physical
The data centre boom is going to force a conversation the digital industry has avoided for twenty years: that digital is physical, that growth has a meter running, and that somebody is always downstream of the demand. You cannot decide where the next gas turbine goes. You decide, every day, how much of the internet gets built on your behalf.
Start by weighing what you already own.
