Private prototype. Facts from research on 2 to 3 October 2026; not yet reviewed for publication. Forms do not submit.

All schemes

Approved - but it's not overWales, Wales

Prosperity Parc, Holyhead (Stena Line)

Outline planning permission for a data centre-led technology campus was reported approved by Anglesey council in September 2025. I could not find the committee date or decision notice: it does not appear on the 3 September or 1 October 2025 Planning and Orders Committee agendas, so it may have been decided under delegated powers. Detailed designs will come in later applications. [S2] [S3] [S4] [S6]

Key facts

Status
Approved - but it's not over (approved) [S2] [S3] [S4] [S6]
Decided by
Isle of Anglesey County Council [S2] [S3]
Applicant
Anglesey Land Holdings (Stena subsidiary); Cadnant Planning acted as planning agent [S5] [S1]
Developer or backer
Stena Line
References
OP/2025/2
Location
Brownfield former Anglesey Aluminium Metal (Penrhos Works) site on Holy Island, Holyhead; within the Anglesey Freeport 'Prosperity Zone'. Site reported as 213, 217 or 220 acres depending on source. [S1] [S3] [S4]
Investment (claimed)
About 1 billion pounds, claimed by the developer [S1] [S2] [S3] [S4]
On-site generation
Battery energy storage system, reported up to 349MW (this is the figure behind the '349MW' headline) [S1] [S2] [S3]
Designations
Anglesey Freeport (Prosperity Zone tax site); 128 acres of green infrastructure proposed [S1] [S3] [S4]
Previous use
Anglesey Aluminium Metal smelter site (Penrhos Works), fully closed 2013 per Place North West [S1] [S3] [S4]

Timeline

  1. 31 December 2022
    Stena Line acquires the former aluminium site (year only, 2022). [S1]
  2. 31 December 2024
    Plans first revealed (December 2024). [S1]
  3. 10 January 2025
    Public consultation closes. [S1]
  4. 7 March 2025
    Outline application OP/2025/2 reported lodged (Place North West article date; Planner reported 14 March 2025). [S1] [S7]
  5. 14 September 2025
    Herald.Wales reports outline approval by Isle of Anglesey County Council (publication date; decision date not found). [S2]
  6. 23 September 2025
    Law firm announcement that planning approval has been secured. [S6]
  7. 11 March 2026
    A change.org petition against the approved AI data centre is created (15 supporters). [S8]

Claims

Claims by developers, campaigners or councils, recorded as claims and not checked as fact.

  • Stena Line (developer): About 1,200 permanent jobs at peak and 890 construction jobs [S2] [S6]
  • Stena Line forecast (developer): Peak annual economic growth of 578 million pounds [S2]
  • Stena Line (developer): Low-carbon technology campus [S2]
  • Council leader Llinos Medi (via DCD) (council): Application is a line in the sand for the old Anglesey Aluminium site [S9]
  • Senedd Research per lead record; every source I read attributes 349MW to the battery storage system (other): 349MW capacity (stated as the data centre by some summaries) [S1] [S3] [S4]

Campaigns

Sources

  1. [S1] Lift off for Anglesey's 1bn pound Prosperity Parc. Place North West. Level 4 source.
  2. [S2] Stena Line's plans for Prosperity Parc approved by Isle of Anglesey County Council. Herald.Wales, 14 September 2025. Level 4 source.
  3. [S3] Prosperity Parc. ADC Infrastructure, 1 November 2025. Level 4 source.
  4. [S4] Anglesey to consider 2.5m sq ft data centre proposals. Place North West, 7 March 2025. Level 4 source.
  5. [S5] Stena Line submits data centre proposal that could bring over 1,000 jobs to Anglesey. Daily Post. Level 4 source.
  6. [S6] Legal team helps secure planning approval for one of UK's largest data centre-led redevelopments. Greater Birmingham Chambers (law firm announcement), 23 September 2025. Level 4 source.
  7. [S7] Wales round-up: Stena Line lodges application for Holyhead technology park (search listing only). The Planner, 14 March 2025. Level 4 source.
  8. [S8] Stop the construction of an AI datacenter in Anglesey (petition). change.org, 11 March 2026. Level 6 source.
  9. [S9] Large data center campus planned in Anglesey, Wales. DatacenterDynamics. Level 5 source.
  10. [S10] Planning and Orders Committee public reports pack, 3 September 2025 and 1 October 2025 (checked, OP/2025/2 absent). Isle of Anglesey County Council, 3 September 2025. Level 1 source.