Solar Panels for Data Centres in Cardiff

Serving Cardiff and the wider Cardiff area, including Penarth, Barry, Caerphilly.

Cardiff — Wales’s data centre hub

Cardiff is Wales’s capital and its primary data centre location, anchoring digital infrastructure for the Welsh public sector, Welsh language media and broadcasting, the Cardiff University research cluster, and the broader South Wales business community. While smaller than the Manchester or Birmingham data centre markets, Cardiff is strategically important as the primary location for sovereign Welsh data infrastructure — data that must remain in Wales for regulatory, language policy, or government requirements.

TeleData is the dominant carrier-neutral colocation operator in Cardiff, providing co-location to Welsh Government agencies, NHS Wales bodies, and enterprise customers across South Wales. The Welsh Government Data Centre at Rhydycar West (Merthyr Tydfil, managed as part of the Cardiff cluster) hosts core Welsh public sector data under the Welsh Government’s Cloud First and Hybrid Cloud strategy. Cardiff University’s Research Computing Service provides HPC infrastructure for the University’s 5,000+ academic staff and significant life sciences and engineering research programmes.

Cardiff’s media cluster is also significant for data infrastructure: S4C (Welsh language broadcaster), BBC Wales (Central Square), and ITV Wales all operate broadcast and media compute infrastructure in the city. These broadcast facilities have high and relatively flat power demands driven by archive storage, live broadcast processing, and content distribution networks.

Cardiff Council’s 2030 net zero target and the Welsh Government’s net zero Wales Carbon Budget framework create a strong policy environment for renewable energy across the city’s commercial sector.

Why Cardiff data centres are investing in solar now

National Grid ESP (formerly Western Power Distribution, Wales and South West) has published significant investment plans for the Cardiff and South Wales distribution network, but connection timescales for new commercial infrastructure remain challenging in some parts of the network. Grid costs for large I&C customers in Cardiff are similar to Bristol and the South West — typically 19–24p/kWh all-in.

On-site solar economics for Cardiff data centres:

• A 400 kW Cardiff rooftop system generates approximately 350,000 kWh per year
• At 20p/kWh, annual savings of £70,000
• Capital cost: £360,000–£440,000 (Welsh contractor market pricing)
• Simple payback: 5.1–6.3 years; IRR 14–18%

Welsh Government data infrastructure is subject to the Welsh Government’s Carbon Literacy requirements and sustainability reporting frameworks, which increasingly require on-site renewable energy evidence. NHS Wales bodies, local authority IT departments, and public sector shared services — all significant consumers of Cardiff data centre capacity — face net zero reporting requirements under the Welsh Government’s Carbon Reporting for Public Bodies programme.

Cardiff Gate and the M4 corridor

Cardiff Gate Business Park, at junction 30 of the M4 on the A48, is Cardiff’s primary out-of-town business park for technology and data operations. The park is positioned at the eastern edge of Cardiff, between the city and Newport — giving it good connectivity to both the Cardiff enterprise market and the Newport/Gwent industrial corridor. Grid infrastructure serving the park includes 11 kV distribution from the Cardiff Gate primary substation, with good available capacity for behind-the-meter solar.

St Mellons Business Park and Capital Business Park (Wentloog Avenue) in east Cardiff add to the corporate and technology campus cluster in this part of the city. These are primarily logistics and enterprise office locations but contain data suites serving Welsh retail and e-commerce operations.

Welsh Government data infrastructure and Scope 2 requirements

The Welsh Government’s own data infrastructure — covering the 22 local authorities, NHS Wales boards, Transport for Wales, and Welsh Government central departments — is subject to the Welsh Government’s sustainability reporting framework (SROI, Green Public Procurement). From 2024, Welsh public bodies are required to report their Scope 2 emissions as part of public body sustainability reports, and data infrastructure operators providing services to Welsh public bodies are increasingly asked to provide supply chain Scope 2 evidence.

On-site PV at Welsh data centres — with MCS certification, real-time monitoring, and our Scope 2 evidence methodology — provides exactly the audit-ready documentation that Welsh public procurement frameworks require. We are familiar with Welsh Government sustainability reporting requirements and format our evidence packs accordingly.

National Grid ESP — Cardiff connection

Cardiff and South Wales are served by National Grid ESP (Wales and South West distribution area). Connection timescales are broadly similar to Bristol:

• G98 (below 50 kW): self-certification
• G99 (50 kW–1 MW): 65 working-day technical study
• G99 extended (above 1 MW): 6–12 months

The Cardiff Gate and east Cardiff business park areas have good available grid capacity for self-consumed solar. We confirm capacity through NGESO’s pre-application service before committing to system design.

Frequently asked questions about Cardiff data centre solar

Does Wales receive enough sunshine for data centre solar to make economic sense? Yes — Cardiff receives approximately 1,600 hours of sunshine per year, making it one of the sunnier locations in the UK (comparable to London and more than Manchester). South Wales’s Atlantic climate provides good diffuse radiation. A 400 kW Cardiff data centre system generates approximately 350,000 kWh per year. The economics are strong — Welsh contractor costs are among the lowest in the UK, offsetting the marginally lower irradiance vs the South East.

Are there Welsh Government grants for data centre solar? Welsh Government’s Business Wales grants programme has included energy efficiency and renewable energy measures for SMEs, but direct capital grants for data centre solar are limited. The Innovative Finance Programme (formerly ERDF-backed) has funded energy projects in Wales. Welsh public sector data centres can apply for Salix Finance (low-interest loans) for energy efficiency projects. We identify the right funding structure for each operator’s ownership type and tax position.

How does the Welsh Language requirement affect data centre planning in Cardiff? Bilingual signage and documentation are required for public-facing communications under the Welsh Language Act. For data centre construction projects, signage, public consultation notices, and planning application summaries must be bilingual where required by Cardiff Council’s Welsh Language Standards. We provide bilingual documentation for planning applications in Cardiff as standard.

Get a feasibility study for your Cardiff data centre

We serve Cardiff, Newport, Swansea, and the full South Wales data centre corridor. Feasibility within 14 working days, NDA on request. We understand Welsh Government sustainability requirements and provide Scope 2 evidence documentation compatible with Welsh public body reporting.