Digital Reef's own filing says its £14.7bn London campus cannot meet a 1.5C trajectory

A developer seeking consent for what would be one of Europe's largest datacentres has written into its own planning application that the scheme "does not align with a science-based 1.5C compatible trajectory and achieving net zero by 2050" ^[1]. That sentence, in support of a £14.7bn project, is the point at which AI capacity growth and corporate climate commitments stop being presented as reconcilable and start being filed as a trade-off ^[1].

The East Havering Data Centre Campus would take 218 hectares of green belt at north Ockendon to run servers and storage for AI and cloud computing, and would rank among Europe's largest if Havering council approves it ^[2]. Its developer, Digital Reef, has separately described the scheme as "a unique opportunity to create a sustainable datacentre campus of the future" ^[3]. The documents put operational output at more than 1m tonnes of CO2 a year, rising to 1.2m tonnes once fully operational, and more than 72m tonnes of CO2e across a projected 60-year life ^[4][5]. Those two figures multiply out exactly, so the disclosure assumes near full-load emissions for essentially the whole life of the asset rather than a decarbonising glide path ^[6]. Guardian analysis of planning documents for the dozens of UK datacentres now proposed found EHDCC's projected emissions to be the highest any developer has disclosed ^[7]. Using the International Civil Aviation Organization's calculator, the Guardian equated 1.2m tonnes to 26,795 Heathrow-to-JFK flights a year ^[8].

The electricity numbers are the operative constraint. Digital Reef says that at a "likely" 50% load the campus would consume 2.65bn kWh a year ^[9]; against Ofgem's 2,500 kWh average household figure, that is about 1.06m homes ^[10][11]. Delivery rests on a 600MVA connection via the Warley substation, requiring a new 400kV National Grid substation and a new 132kV UK Power Networks facility, with the full connection expected in 2033 ^[12]. By 2038, operational emissions alone are projected to consume nearly 20 times the entire carbon budget of the borough of Havering and almost 1% of the UK's ^[13].

The policy backdrop has moved in the developer's favour. Datacentres were designated critical national infrastructure in 2024 ^[14]; by early 2025 the government estimated they used 2.5% of UK electricity and predicted a fourfold increase by 2030 ^[15]; and in January planning legislation was amended so developers can apply as nationally significant infrastructure projects, largely bypassing local authorities ^[16]. Neso, the grid operator, has told MPs that datacentre developers have requested 72.8GW of connections by 2039, nearly 60% more than last year's UK peak demand ^[17]. The national policy statement promised for the sector, from the now-disbanded DSIT, has not been published ^[18].

Donald Campbell of the nonprofit Foxglove called the projected emissions "staggering" and a threat to UK decarbonisation, and argued the companies served should be required to carry the cost ^[19][20]. The North Ockendon Residents Association called the plan a "massacre" of green belt farmland ^[21].

Three things to watch. Whether this application stays with Havering council or migrates to the NSIP route now available ^[16][2]. Whether the unpublished national policy statement attaches emissions conditions to consent, or ratifies the current position ^[18]. And whether the 2033 connection date holds, given that the site needs two new substations before it can draw its full load ^[12].