TL;DR

The Welsh government, not Cardiff council, will decide whether developer Curtis Hall can build a 30,292 square-metre data centre at the Llanrumney park-and-ride in east Cardiff, the BBC reported on 12 November. Planning minister Sian Gwenllian called the application in on the eve of the council committee meeting that was due to consider it, a meeting that was then cancelled. Council officers had recommended approval.

Gwenllian’s letter to the council said the scheme raised issues “of more than local importance”, including “potential conflict with national policy on transport, energy and flood risk”. An inspector from PEDW, the Welsh planning decisions body, will now examine the application and report to the minister, and could choose to hold a public inquiry. No timescale has been given.

Why the case drew national attention

Objections came from several directions. Around 4,000 people signed petitions, and every Member of the Senedd for the constituency, from Plaid, Labour, Reform and the Greens, objected, one of them a Welsh government minister. Concerns covered climate impact, water consumption, flooding, noise, lighting, air quality and losing the bus interchange.

The power plan is a flashpoint. Curtis Hall wants permission for gas turbines of 49.9MW to power the site for as long as five years until it has a grid connection; Friends of the Earth calls this “climate-wrecking”. Generation of 50MW or more needs Welsh government consent, and the developer denies sizing the plant to stay under that line. It says the turbines are a worst-case fallback.

Not everyone welcomed the call-in. Reform MS Cai Parry-Jones, who objected to the scheme, said local councillors, not “the Cardiff Bay lanyardocracy”, should decide. Labour MP Jo Stevens had given “conditional support”, provided local water supplies were protected. Curtis Hall says it will keep working constructively with ministers.

The Westminster backdrop

The case lands as UK ministers push for more capacity. In comments to The Times, reported by LBC, Chancellor John Healey said he was prepared to support new data centres that deliver community benefits and help build public trust, while avoiding the unregulated rush seen in the US. He wants NHS and security data processed in Britain. His Budget last month introduced a data centre covenant tying grid connections to local investment, jobs and water protection, a theme our 9 November report on the growth minister also covered.

Looking Forward

Wales is drafting its own national data centre policy, and the inspector’s report will be read against it. Approval is still possible. In our view, the Cardiff case shows that the political test for these projects is moving from local committees to national ministers. Developers planning UK sites should expect water, power and lost public amenities to be argued at that level.