Summary
- Amazon Data Services UK is seeking a bespoke environmental permit for emergency backup generation at the planned Ridgeway data centre in Iver.
- The application covers 27 HVO/diesel-capable generators with a combined rated thermal input of 222.98MWth.
- The Environment Agency consultation opened on 24 September and is due to close on 22 October 2026.
The Environment Agency has opened a public consultation on the emergency power installation planned for Amazon Data Services UK’s Ridgeway data centre in Iver, Buckinghamshire, bringing the proposed site’s backup generation and fuel infrastructure into the environmental permitting process.
Amazon Data Services UK is seeking a bespoke environmental permit covering 27 emergency standby generators with a combined rated thermal input of 222.98MWth.
The Environment Agency consultation opened on 24 September and is scheduled to close on 22 October 2026.
Application documents state that 26 generators would support the data centre’s IT operations, while a separate house generator would provide emergency electricity to non-IT infrastructure. The sets would be capable of operating on diesel or hydrogenated vegetable oil.
The planned facility has not yet been built or commissioned, and the generators themselves have not yet been procured, according to the project’s non-technical environmental-permit summary.
Backup power remains a regulated installation
The site’s primary electricity supply is intended to come from the local transmission network. The generators are designed for grid outages and other emergency conditions rather than routine commercial generation.
The permit documents say there are no agreements for elective electricity export and that the generators would not be operated for Triad avoidance. Battery arrays would provide temporary uninterruptible power during the interval between detecting a grid fault and bringing the standby generation online.
That architecture reflects the resilience model used across large data centres: short-duration batteries bridge the immediate interruption, while combustion generation is designed to sustain the facility for longer outages.
The environmental implications arise because a generator fleet capable of supporting a large IT load also constitutes substantial combustion plant. The proposed 222.98MWth aggregate rating takes the installation into a permitting regime covering emissions, fuel storage, operating techniques, monitoring, and environmental risk.
The application says each generator would operate for less than 500 hours a year. Planned maintenance and testing would be scheduled to minimise air-quality impacts, while emergency operation would depend on grid conditions.
An air-quality assessment submitted with the application considered both routine testing and an assumed 60 hours of grid-outage operation. The applicant’s assessment concluded that those scenarios would not produce significant effects on human or ecological receptors.
That conclusion remains part of the application rather than a final Environment Agency permitting decision. The regulator is now inviting comments on technical standards, sensitive receptors, pollution control, monitoring, and other matters within the environmental-permitting regime.
Fuel and emissions controls form part of the design
The non-technical summary sets out a series of proposed controls around the generators and fuel system. The main units would use vertical exhaust stacks 25 metres above ground level to assist dispersion.
A 40,000-litre bulk fuel top-up tank would be installed within a bund designed to retain 110% of its volume. Individual generator enclosures would incorporate 16,000-litre belly tanks with containment, monitoring, alarms, and leak-detection measures.
The application also describes hardstanding, drainage through an oil interceptor, spill-response procedures, preventative maintenance, fuel-delivery controls, and fuel-polishing equipment.
Amazon would be required to develop an Air Quality Management Plan covering circumstances in which a prolonged outage could result in extended generator operation. The operator would liaise with the Environment Agency on actions to be taken in such a scenario.
The permitting process is separate from land-use planning. The Environment Agency explicitly states that the consultation is concerned with whether the regulated activity can be carried out without significant risk to the environment or human health, rather than whether the data centre should be located at Ridgeway in principle.
That separation is increasingly relevant as large UK data centre projects move through multiple consent processes. Planning determines whether and how the physical development can proceed, while environmental permitting examines specific regulated plant and its operational controls.
For Ridgeway, the current process is focused squarely on resilience infrastructure: the generators, associated fuel storage, emissions, testing, and emergency operation required to support continuous data centre service if grid electricity is interrupted.
