Google’s planned AI datacentres in Essex and a major facility by Greystoke in north Lincolnshire have significantly understated their projected carbon emissions in official planning documents, raising serious concerns over transparency and environmental accountability. Independent analysis reveals these developments could contribute far more to the UK’s carbon budget than publicly acknowledged—potentially undermining the nation’s climate goals.
What Happened: Misstated Carbon Footprints in Planning Applications
Google aims to construct two massive AI datacentres: a 52-hectare site in Thurrock and another on an airfield near North Weald, both located in Essex. As part of the planning process, developers must estimate how much carbon their projects will emit relative to the UK’s total carbon budget. However, experts at the tech justice nonprofit Foxglove discovered that Google’s teams compared the datacentres’ emissions over a single year to the country’s five-year carbon budget, effectively understating their climate impact by a factor of five.
This flawed calculation method also appears in planning documents for the Elsham Tech Park datacentre by Greystoke in north Lincolnshire, one of the UK’s largest such facilities. Collectively, the emissions from these three datacentres are projected to consume over 1% of the UK’s carbon budget for 2033—equivalent to the annual emissions of a mid-sized city like Bristol.
Tim Squirrell, Foxglove’s head of strategy, condemned these discrepancies: “By comparing one year of datacentre emissions with five years of UK emissions, Google is making the environmental impact look five times smaller than it really is.” He warned that this misrepresentation could seriously mislead local councils and the public about the true climate consequences of these developments.
Details of the Emission Understatements
Google’s Thurrock datacentre claimed it would produce emissions amounting to just 0.033% of the UK’s carbon budget between 2028 and 2032. In reality, its impact will be approximately 0.165% over that period. Similarly, the North Weald datacentre stated emissions at 0.043% of the UK’s carbon budget from 2033 to 2037, but actual emissions are closer to 0.215%.
The Greystoke facility at Elsham Tech Park reported emissions representing 0.1043% of the UK’s carbon budget in 2033, yet the accurate figure is over five times higher at 0.5215%. These numbers highlight a systemic issue in how large AI datacentre projects are estimating and presenting their carbon footprints in official documents.
Local councillor Steven Heather emphasized that the planning department will scrutinize these figures before final approval. “If there is a gross error, they’ll obviously pick up on it. When it goes to the submissions stage, the developers will have to come back with the proper figure,” he said. This highlights the ongoing process and the potential for corrections before projects move forward.
Why This Matters: The Environmental and Policy Implications
Datacentres are critical infrastructure powering AI and digital services, but they are also energy-intensive and generate significant carbon emissions. The scale of these UK projects means their emissions could rival those of major transport hubs—Thurrock’s datacentre alone is projected to emit more carbon than an international airport. At Elsham Tech Park, peak emissions could reach nearly 1 million tonnes of CO2 equivalent in 2033-34, just shy of the 1.2 million tonnes generated annually by all domestic UK flights.
Despite these substantial emissions, all three datacentres were classified as having a “minor adverse” impact on the UK’s climate objectives in their planning assessments. Developers have argued their operations will be tolerable within the broader climate roadmap and have highlighted biodiversity initiatives, such as bird and bat boxes and wildflower grasslands at Elsham Tech Park, as environmental mitigation measures.
However, these findings underscore a larger pattern of inconsistent and unreliable accounting around AI infrastructure’s environmental footprint. Recent government reports revealed a tenfold discrepancy between departments in forecasting energy use for UK datacentres, illustrating a fragmented approach to integrating AI expansion with decarbonisation goals.
Google has not responded publicly to requests for comment on the emission misstatements. Greystoke acknowledged the issues, stating it expects to submit revised figures as the planning process continues. The developers emphasized the project’s economic benefits, including £10 billion in private investment, thousands of jobs, and support for local supply chains.
Looking Ahead: What This Means for UK Climate Policy and AI Development
The revelations about Google and Greystoke’s carbon accounting raise urgent questions about transparency and environmental governance in the UK’s AI sector. As datacentres expand to meet growing demand for AI computing, ensuring accurate emissions reporting becomes critical to aligning infrastructure growth with climate commitments.
Local authorities and policymakers face increasing pressure to scrutinize developers’ claims rigorously and demand reliable data. Without this, the risk of underestimating AI’s environmental impact could lead to decisions that inadvertently stall progress toward net zero emissions.
For communities and climate advocates, these findings highlight the need for vigilance and engagement in planning processes to hold technology companies accountable. The future of AI in the UK depends not only on innovation and investment but also on responsible stewardship of the environment.
Full details about any revised emissions figures and planning outcomes have not yet been released, but the ongoing scrutiny signals a turning point in how large-scale AI datacentre projects must address their climate responsibilities.
