Welsh Government Takes Control of Curtis Hall Data Centre Plan Cardiff 2026

Key Points

• Ministerial Intervention: Welsh Planning Minister Sian Gwenllian decided to “call in” the planning application for a proposed data centre in eastern Cardiff, taking the decision out of Cardiff Council’s hands.
• Timing of Decision: The intervention was made on Wednesday evening, less than 24 hours before Cardiff Council’s planning committee had been due to meet on Thursday, 12 November 2026, to discuss the scheme.
• Site and Scale: Developer Curtis Hall Ltd seeks permission to construct a 30,292 square-metre data centre facility on the site of the Cardiff East Park and Ride near Llanrumney and Pentwyn.
• Temporary Gas Power: The proposal includes plans for 49.9MW gas turbines to temporarily power the site for up to five years until a permanent national grid connection is secured.
• Widespread Opposition: The application attracted approximately 4,000 petition signatures and formal objections from all of Caerdydd Fynnon Taf’s Members of the Senedd, spanning Plaid Cymru, Labour, Reform, and the Green Party.
• Environmental and Local Concerns: Objectors raised alarms over climate change impacts, air quality, lighting, noise, flood risk, water consumption, and the loss of a park and ride facility used by staff and patients of the University Hospital of Wales.
• Next Steps: Planning and Environment Decisions Wales (PEDW) will now examine the application and submit a report to the cabinet minister for local government, housing and planning for a final decision.

Cardiff (Cardiff Daily) November 12, 2026 – Controversial plans by developer Curtis Hall to build a 30,292 square-metre data centre on the site of a park and ride near Llanrumney in eastern Cardiff will now be decided by the Welsh Government rather than Cardiff Council.

Welsh Planning Minister Sian Gwenllian issued the call-in decision on Wednesday evening, hours before councillors were scheduled to debate the scheme, citing substantial controversy and environmental concerns of more than local importance. The application will now be examined by Planning and Environment Decisions Wales (PEDW) before Welsh ministers make a final determination.

Why Did the Welsh Government Intervene in the Cardiff Data Centre Application?

Welsh Planning Minister Sian Gwenllian intervened after concluding that the scale and environmental implications of the proposed development extend beyond local planning jurisdiction.

In a formal letter addressed to Cardiff Council, Gwenllian stated that she had

“concluded the proposed development raises issues of more than local importance, including potential conflict with national policy on transport, energy and flood risk”.

The cabinet minister further noted in the letter that

“wide interest in the environmental impact and the policy in relation to data centres means the case has generated substantial controversy beyond the immediate locality”.

She added:

“All these matters lead the cabinet minister to conclude the development is of more than local importance and the applications should be determined by the Welsh ministers.”

Confirming the intervention, a Welsh government spokeswoman outlined the procedural steps ahead:

“This case will now be passed to Planning and Environment Decisions Wales [PEDW], who will examine Cardiff Council’s planning application and provide a report to the cabinet minister for local government, housing and planning to make a final decision in due course.”

As reported by Ian Walmsley of Planning Geek, Senedd member Ms Akbar stressed that the ministerial call-in should not be mistaken for an outright rejection of the project. Ms Akbar stated:

“The data centre has not been rejected.”

Under Welsh planning law, a call-in transfers decision-making authority from the local planning authority to ministers, requiring an independent inspector to review the evidence before a final ruling is issued.

What Are the Main Concerns Over Curtis Hall’s Llanrumney Proposal?

Developer Curtis Hall Ltd is seeking planning permission to demolish existing structures and construct a 30,292 square-metre data centre campus on the Cardiff East Park and Ride site near Llanrumney and Pentwyn. The proposal has generated roughly 4,000 signatures on petitions and formal objections from every Member of the Senedd representing Caerdydd Fynnon Taf, including Plaid Cymru, Labour, Reform, and Green politicians, as well as a serving Welsh government minister.

Local residents, environmental groups, and elected representatives have highlighted multiple areas of concern:

• Energy and Climate Impact: Friends of the Earth described the developer’s proposal to potentially operate 49.9MW gas turbines for up to five years—until a grid connection becomes available—as “climate-wrecking”.
• Loss of Hospital Transport Links: As noted by Ellie Gosley of Wales Online, the Cardiff East Park and Ride facility serves the University Hospital of Wales, providing vital free parking and shuttle links for NHS staff and patients.
• Local Environmental Disruption: Objectors have raised concerns regarding air quality, noise pollution, artificial lighting, local flood risks, and heavy water usage required for cooling data servers.

In response to criticism over the temporary energy plant, Curtis Hall stated that the 49.9MW gas turbines would only be utilised in a worst-case scenario if alternative technologies could not be deployed. Under UK and Welsh energy regulations, generating stations with a capacity of 50MW or more automatically require ministerial consent rather than council approval. Curtis Hall denied that it had capped the proposed plant’s capacity at 49.9MW in order to bypass national-level energy consenting procedures.

In earlier reporting by Herald.Wales (with additional reporting by Kieran Molloy), Curtis Hall Ltd denied that the development would cause a significant negative impact on the surrounding neighbourhood and stated that NHS parking would remain operational at the site until an alternative location had been proposed. Curtis Hall has been approached for further comment following the ministerial call-in.

How Have Politicians and Cardiff Council Responded to the Call-In?

The intervention followed months of cross-party political pressure and community campaigning ahead of Cardiff Council’s cancelled Thursday planning committee meeting.

Reaction from Senedd Members and Local Councillors

Plaid Cymru Member of the Senedd (MS) Nick Carter, who was among the politicians lobbying ministers to call in the application, welcomed the announcement. Carter stated that the move was the

“right decision and a major step forward for everyone who has fought to protect this community.”

As reported by Martin Shipton of Nation.Cymru, Pentwyn Liberal Democrat councillor Joe Carter, who has campaigned against the development for 11 months, also praised the intervention. Joe Carter stated:

“This is a huge win for our community. We have been saying since May that the new government should call this in and take the decision out of the hands of the council.”

Additionally, as reported by Herald. Wales, Senedd member Ms Akbar stated that local residents needed

“clear answers, credible evidence and a planning decision that puts people first”.

Jo Stevens, Labour MP for Cardiff East, had previously informed constituents that she offered the scheme “conditional support” provided it did not compromise local water supplies. Stevens stated that the case for data centres

“of this type reflects the evidenced demand for digital infrastructure to support the UK’s growing technology sector”.

Cardiff Council’s Planning Recommendation

Prior to the ministerial intervention, Cardiff Council’s own planning officers had recommended that the planning committee approve the application. Officers argued that the data centre would help diversify Cardiff’s economy, generate digital investment, and deliver a new transport link into Llanrumney.

The council’s assessment concluded that many environmental impacts could be avoided, mitigated, compensated for, or appropriately managed, determining that air quality effects would not be significant. To address the loss of the park and ride, council planners recommended requiring the developer to enter a legal agreement guaranteeing an alternative park and ride facility with at least 225 spaces, while maintaining the existing number of spaces on-site until the replacement facility was completed.

Background of the Development

Plans for the Cardiff East data centre campus first emerged publicly in February 2026, covering an approximate 40-acre parcel of land at the Cardiff East Park and Ride off the A48 near Llanrumney. Cardiff Council had entered into an agreement to sell the site to private developer Curtis Hall Ltd, which proposed demolishing the existing transport infrastructure to build three data centre halls, an on-site electrical substation, ancillary energy infrastructure, administrative buildings, and a bridge across the Rhymney River.

As public opposition mounted—resulting in over 1,600 formal objections submitted to the council and thousands of petition signatures—the Welsh Government issued a holding direction on 24 August 2026. That legal directive prevented Cardiff Council from granting planning permission while ministers evaluated whether to take over the case. The controversy unfolds alongside a wider debate across Wales regarding the rapid proliferation of energy- and water-intensive data centres. Plaid Cymru government ministers are currently drafting Wales’s first dedicated national data centre policy, which is scheduled for publication before the end of 2026.

Prediction: How Will This Development Affect Local Residents, NHS Commuters, and Developers?

The Welsh Government’s decision to call in the application shifts the timeline and regulatory threshold for everyone connected to the Llanrumney site:

• Local Residents and Campaigners: Residents in Llanrumney and Pentwyn gain an extended opportunity to submit evidence to an independent Planning and Environment Decisions Wales (PEDW) inspector. Rather than facing an immediate vote by Cardiff Council’s planning committee—where officers had already recommended approval—campaigners will have their environmental, flood-risk, and noise objections weighed directly against the Welsh Government’s upcoming national data centre policy.
• NHS Staff and Hospital Visitors: Commuters relying on the Cardiff East Park and Ride to reach the University Hospital of Wales will experience no immediate disruption to their free parking and bus links. Because a PEDW examination and ministerial determination typically take several months, the existing transport hub will remain operational throughout the inquiry process.
• Curtis Hall Ltd and Tech Infrastructure Developers: Curtis Hall faces significant delays and heightened scrutiny regarding its proposed 49.9MW temporary gas turbines and water-cooling requirements. More broadly, the call-in signals to digital infrastructure developers across Wales that large-scale data centre proposals will no longer be approved solely on local economic grounds, and must instead align strictly with national decarbonisation, grid-capacity, and water-conservation standards once the Welsh Government publishes its formal policy later this year.