Solar Panels for Data Centres in Hayes

Serving Hayes and the wider Greater London (London Borough of Hillingdon) area, including Southall, Uxbridge, West Drayton.

Hayes — West London’s emerging data centre cluster

Hayes in the London Borough of Hillingdon has established itself as one of the most important data centre locations in West London, sitting in the corridor between the Slough Trading Estate to the west and the Docklands cluster to the east. Its proximity to Heathrow — with direct connections to transatlantic fibre landing at Slough and the A4/M4 corridor running to London — makes it a natural location for facilities requiring both London interconnect proximity and lower land costs than central or east London.

Kao Data operates its Hayes campus (Hayes Way, UB3) as a purpose-designed hyperscale and high-density colocation facility, with phases 1 and 2 totalling over 50 MW commissioned IT load. CyrusOne (formerly Zenium Data Centres, acquired by CyrusOne in 2017) operates adjacent facilities designed to Uptime Institute Tier III and Tier IV standards. The Heathrow Business Park and Stockley Park host additional enterprise data suites and financial services compute infrastructure.

The Hayes data centre market is growing rapidly. Multiple planning applications for new data centre buildings and campus extensions are active with the London Borough of Hillingdon, and the council’s 2035 Local Plan identifies the Hayes/West Drayton employment land corridor as a strategic location for digital infrastructure development. This pipeline of new construction creates an opportunity for solar PV to be integrated into new buildings at design stage — often the most cost-effective approach, as PV-ready roof structures, cable containment, and inverter space can be incorporated without the access and retrofit costs of an existing building installation.

Why Hayes data centres are under sustainability pressure

Kao Data’s hyperscale campus serves hyper-scale cloud tenants — AWS, Azure, GCP — who all have published 2030 commitments to 100% hourly carbon-free energy (CFE) matching. CyrusOne’s European sustainability strategy includes on-site renewable energy targets across its UK portfolio, with Hayes as a priority campus. The combination of customer-driven sustainability SLAs and corporate operator commitments means Hayes has a strong and growing demand for on-site renewable evidence.

UK Power Networks (UKPN), the local DNO, has flagged West London — including Hillingdon, Ealing, and the Slough border area — as a priority area for distribution network reinforcement in its RIIO-ED2 plan. Grid import capacity constraints in the UB3/UB7 area mean that operators planning capacity expansions face 18–36 month connection timescales for new grid supplies. On-site PV reduces peak import demand, supporting operators who need to manage grid connection constraints while scaling IT capacity.

Heathrow proximity — security, access, and planning considerations

Hayes data centres’ proximity to Heathrow Airport introduces specific planning and access considerations:

Aerodrome safeguarding. The CAA’s aerodrome safeguarding area for Heathrow extends over parts of Hayes. Rooftop PV installations in the safeguarding zone require notification to Heathrow Airport Limited (HAL) and the CAA. Most flat-roof PV systems below 2 metres in height above parapet are not affected, but taller mounting systems or ground-mount arrays within 5 km of the runway threshold require consultation. We manage this process as part of our planning support service.

Glare assessment. Some London Borough of Hillingdon planning applications for rooftop solar near Heathrow require a glare assessment to confirm that reflected sunlight from PV panels does not create a hazard for aircraft on approach. We commission photometric glare studies from specialist consultants where required.

BPSS and security clearance. Heathrow’s security perimeter and the presence of government and defence-adjacent facilities in the Hayes corridor mean that a number of data centres require BPSS-cleared installation staff. Our project management team holds current BPSS clearance, and we can arrange broader team vetting for extended engagement.

Hayes and the M4 data centre corridor

Hayes is the western anchor of the M4/A4 data centre corridor that runs from central London through Brentford, Chiswick, Hounslow, and into the Thames Valley. This corridor was the first in the UK to develop as a major data centre cluster, driven by the M4 fibre route, Thames Valley power infrastructure, and the cluster of technology firms from the 1990s and 2000s.

The corridor now has a density of data centre facilities comparable to some US hyperscale parks, with multiple facilities per mile along the Bath Road and Hayes Way arteries. The buildings vary enormously in age and specification — from 1980s industrial conversions with asbestos cement roofs to 2020s purpose-designed hyperscale halls with PV-ready EDPM roofing.

Our engineering approach adapts to this diversity. For heritage industrial buildings, we provide combined roof replacement + PV proposals that treat the re-roof as cost-of-upgrade and the PV as the payback vehicle. For modern data halls, we specify ballasted or penetration-anchored systems on profiled steel or EDPM roofing. For new-build projects, we provide technical specifications for PV-ready roof design for the developer’s building contractor to incorporate at construction stage.

UK Power Networks — Hayes connection process

For Hayes data centre solar:

• G98 self-certification: systems below 50 kW
• G99 application: systems 50 kW–1 MW (65 working-day statutory timescale)
• Systems above 1 MW: extended technical review, 6–12 months

For zero-export (fully self-consumed) systems, UKPN’s technical review is simplified because there is no reverse power flow to assess. We specify zero-export relay protection on all Hayes data centre systems above 100 kW, accelerating the G99 review process.

Frequently asked questions about Hayes data centre solar

Can PV be installed on Kao Data or CyrusOne’s buildings without disrupting Tier III operations? Yes — we have delivered solar installations at Tier III and Tier IV-rated facilities without operational interruption. The design uses phased AC connection to isolate switchboard work to one panel section at a time, with temporary bypass maintaining supply throughout. All energisation is tested against UPS transfer and generator scenarios before live connection.

What is the aerodrome safeguarding process for Hayes rooftop PV? For most flat-roof arrays below 2 m mounting height, safeguarding notification is straightforward — we submit a notification to HAL, who typically respond within 28 days. If a glare assessment is required, we commission a photometric study from our specialist consultant, which typically adds 4–6 weeks to the planning process. We manage both as part of our project planning support.

Are there specific planning requirements from London Borough of Hillingdon for data centre solar? Hillingdon’s Local Plan 2012 (and emerging 2035 plan) treats rooftop solar as Permitted Development in most cases. For large systems (above 50 kW) and for listed or conservation-adjacent buildings, a Certificate of Lawful Development or Prior Approval may be required. Major data centre campus extensions require full planning permission, in which case we provide PV feasibility input into the sustainability chapter of the planning application.

How does Hayes grid pricing compare to Slough and London? Hayes falls in UKPN’s South East region for distribution charges. All-in grid costs for large I&C data centre customers in Hayes are comparable to London — typically 23–27p/kWh at current market rates. This makes the solar payback economics similar to London: 4.5–6.5 years depending on system size and roof access costs.

Get a feasibility study for your Hayes data centre

We serve the full West London data centre corridor — Hayes, Uxbridge, West Drayton, Heathrow Business Park, and Stockley Park. Feasibility in 14 working days, NDA before engagement. We’ll manage the Heathrow safeguarding process and any planning support you need.