A request has been made for Welsh Ministers to consider taking over the planning decision on a proposed 21,490-square-metre data centre at Mwyndy Cross, near Pontyclun. The Welsh Government’s planning casework list, updated on 16th October 2026, records the Mwyndy data centre under case number 2040.
The request was received on 9th October 2026 and its official status is under initial processing. That is not a decision to call the application in, not planning permission, and not a ruling on whether the proposal is acceptable. The underlying development is described as a Class B8 data centre with access, parking, drainage, landscaping and utilities.
The distinction matters to residents, businesses and landowners around Pontyclun because the question is currently who should decide the application, rather than whether it should be approved. I would treat the casework entry as a live procedural record, not an indication that Ministers have taken over the application. The proposal’s scale makes the Mwyndy data centre a consequential local planning matter, but its eventual effects and planning merits remain to be assessed against the submitted evidence.
What has happened to the Mwyndy data centre?
The primary source for this development is the Welsh Ministers’ active planning cases document. Its final page identifies case 2040 as a Call In Request (Planning), gives the location as land at Mwyndy Cross, Pontyclun, and states that the case is under initial processing. It describes the proposed building’s floorspace as 21,490 sq m.
That wording is narrower than an announcement that Welsh Ministers have stepped in. A request starts a consideration process; Ministers must still decide whether the planning application raises grounds for them to exercise their powers. The register does not presently record a call-in direction or final determination for this case.
The date, 9th October, is the date the ministerial request was received. It should not be confused with the date of a planning application, an application-validation decision or any eventual permission. The 16th October date is when the public Welsh Government casework page was last updated, providing fresh visibility of this request.
Readers comparing stories about this site should identify the Mwyndy data centre by its location and description. Other industrial proposals in the surrounding area are separate planning applications and should not be bundled into this call-in request.
Which planning application is involved?
A formal planning notice issued on behalf of Rhondda Cynon Taf County Borough Council, dated 22nd June 2026 and published in the Western Mail, identifies application 26/0404/FUL for the erection of a 21,490 sq m Class B8 data centre at land east of the A4119, Mwyndy Cross, Pontyclun. It names Talbot Green Developments Ltd as applicant. The description matches Welsh Government case 2040, providing original council-issued evidence of the local application and its authority. The current documents and application status should be checked through the council’s planning application search.
The same official planning notice identifies a different application, 26/0413/FUL, concerning a 9,980 sq m light-industrial building at Mwyndy Cross. These are distinct references and different development descriptions. The ministerial casework entry for 2040 names the 21,490 sq m data centre; it does not state that the separate industrial building has been called in or placed under consideration.
There is a discrepancy in the Welsh Government’s casework list: its “LPA Area” column says Torfaen for case 2040. However, the council-issued statutory planning notice expressly identifies Rhondda Cynon Taf County Borough Council and application 26/0404/FUL for the same location, applicant proposal and 21,490 sq m data centre. This provides direct local-authority evidence; the Welsh Government has not yet corrected or explained the different label in its published list. For local application records and representations, readers should use the Rhondda Cynon Taf reference, while tracking the separate ministerial request as case 2040.
The Mwyndy data centre therefore has a verified ministerial case reference and a matching council-issued planning notice. The unexplained Torfaen label should be treated as a discrepancy in the government register, not as evidence of a separate planning application in Torfaen. Neither public notice replaces the full application file, drawings or technical assessments.
How does a Welsh planning call-in work?
Under Welsh Government guidance on calling in planning applications, most applications are determined by the local planning authority. Section 77 of the Town and Country Planning Act 1990 gives Welsh Ministers power to direct that a particular application be referred to them for determination instead.
An individual or organisation may request a call-in, but making the request does not confer a right to have a proposal determined by Ministers. The guidance says the power is used selectively, generally for matters of more than local importance, and applications should ordinarily stay with local planning authorities.
The decision whether to call in is separate from the merits of granting planning permission. If Ministers eventually call a proposal in, an Inspector normally examines the application through written representations, a hearing or an inquiry and reports with a recommendation. The ministerial decision follows that process. None of those subsequent steps is established merely by the current Mwyndy data centre entry.
The same guidance explains that a temporary holding direction can sometimes be issued while a call-in request is considered, but not automatically. The publicly available case entry does not confirm that one has been issued here. No restriction on the council’s decision-making should be asserted without a separate direction or reliable confirmation.
Which issues matter for Pontyclun?
The local planning assessment is likely to need evidence on access arrangements from the road network, movements during building and operation, the capacity of local infrastructure, drainage and flood risk, landscape effects, and any effects of electrical or mechanical equipment. Those are issues to examine, not findings that the Mwyndy data centre necessarily causes unacceptable impacts.
The distinction between the scale of a data-centre building and the volume of future traffic is particularly important. Large floorspace does not alone establish how many vehicle journeys there will be, either during construction or in operation. The applicant’s supporting transport and construction details, and the council’s assessment, are the proper sources for those figures.
Likewise, the proposal’s Class B8 description should be read as the development description used in the application. It does not remove the need to establish the use’s detailed planning implications, particularly where a specialist building contains substantial power, cooling or servicing equipment.
Employment and potential investment may be relevant considerations, but they should not be reported as secured benefits before their evidence is examined. Questions of landscape change, nearby amenity, biodiversity and flood management also depend on plans and technical reports, not simply a project title.
What happens next with the Mwyndy data centre?
The first question is whether Welsh Ministers decide to exercise their call-in power. The published status of under initial processing does not provide a date by which that decision will be made. Anyone following the case should check the updated Welsh Government casework list for a changed status or a formal direction.
The second question is what the council application file confirms about the development, representations, relevant planning policy and any outstanding technical evidence. The application can be traced through the council search using reference 26/0404/FUL. The separate industrial-building reference should be checked independently rather than assumed to form part of case 2040.
For formal correspondence, the original Rhondda Cynon Taf planning notice is more reliable than the unexplained authority label in the Welsh Government table. Residents and businesses should identify the site and planning reference, check the council’s current representation arrangements and use ministerial case 2040 separately when following the call-in request.
For now, the verified news is limited but important: Welsh Ministers have received a request to take over the Mwyndy data centre decision, and the request is still being processed. No ministerial call-in, planning approval or refusal has yet been demonstrated by the cited casework record.
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