Park information

Where is Twyn Hywel Energy Park?

Twyn Hywel Energy Park is located 2km north-west of Caerphilly and within both Caerphilly County Borough Council and Rhondda Cynon Taf County Borough Council. The nearest towns and villages are Senghenydd, Trallwn, Cilfynydd, Nelson, Abertridwr and Llanbradach.

The location has been carefully chosen due to its good wind speeds, good site access and available connection to the electricity grid. The majority of the site sits within a Pre-Assessed Area for large-scale onshore wind energy according to the Welsh Government’s National Development Framework, Future Wales: The National Plan 2040.

What will the park consist of?

Much of the site consists of open moorland, with irregular grazing fields and areas of natural woodland on the peripheries. Large parts of the site are designated as common land with open access and a number of public rights of way run through the site which will be kept open throughout the operation of the project.

The site will have access tracks, an electrical substation, wind measurement equipment and temporary construction storage compounds. Access to the site will be from the A472 to the north of the park. Access and recreational routes and connectivity will be retained across the park as part of a recreational management plan.

Habitat management areas will also be integrated into the park.

The journey so far

We first consulted on our proposals to generate clean, green energy at Twyn Hywel in 2021 and early 2022. Feedback received from local communities, stakeholders and specialist consultees helped evolve the proposals ahead of Statutory Consultation that ran from November 2022 to January 2023.

Twyn Hywel Energy Park received planning approval from Welsh Government in November 2024 and began construction in June 2026 – which means the park will start generating clean, green power by 2027.

Scroll left and right on the timeline below to explore how the project has progressed and next stages.
Initial consultation with local
communities, stakeholders
and experts.
2021 - 2022
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Initial consultation with local
communities, stakeholders
and experts.
2021 - 2022

Non-statutory engagement with communities, specialist consultees and other stakeholders.

This is our first round of consultations. During this stage, we continue carrying out environmental surveys and assessments to inform the draft Environmental Impact Assessment (EIA). At the same time, we begin shaping the design of the proposed energy park. To do this, we hold an ‘informal’ consultation round, where we present early proposals and invite feedback from communities, stakeholders and consultees. It’s known as ‘non-statutory’ consultation, because we aren’t required to undertake it, and we won’t yet have all the details about the plans; however, we see great value in presenting our early plans in order to help inform the design process. 

Evolution of our proposals –
informed by consultation
feedback.
2022
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Evolution of our proposals –
informed by consultation
feedback.
2022
Statutory Consultation with
local communities, stakeholders
and experts.
November 2022 - January 2023
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Statutory Consultation with
local communities, stakeholders
and experts.
November 2022 - January 2023

Statutory consultation with local communities, specialist consultees and other stakeholders.

This is the formal consultation required before we submit our application. At this stage, we’ll have a full ‘Draft’ Environmental Statement (ES), which sets out the conclusions of all the surveys and assessments we’ll have carried out, in line with PEDW’s Scoping Direction. We conduct a formal consultation for a period of at least 42 days. This consultation is a requirement before we can submit an application, which is why it is called ‘statutory consultation’. We’ll post formal notices in the paper and around the site, and notify relevant consultees, for example Natural Resources Wales and other environmental or technical consultees, local councillors and community councils, and those owning neighbouring land or living nearby. We’ll also host consultation events both in-person and online to present our proposed plans before we submit them to PEDW for consideration. 

Submitted our application
for a Development of
National Significance.
May 2023
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Submitted our application
for a Development of
National Significance.
May 2023
Welsh Ministers
approved our application.ation.
November 2024
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Welsh Ministers
approved our application.ation.
November 2024
Finalise conditions for formal
agreement with PEDW.
Late 2025
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Finalise conditions for formal
agreement with PEDW.
Late 2025

What are planning conditions?
When a wind farm gets planning permission, the approval usually comes with a list of rules that the developer must follow. These rules are called planning conditions.  They are added by the local planning authority to make sure the wind farm is built and operated in a way that:

  • protects the environment
  • keeps people safe
  • respects nearby communities
  • ensures the project is built properly and as agreed

Think of them as “you can build this, but only if you do these things too.”

Ground investigation works begin. Spring 2025
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Ground investigation works begin.Spring 2025

Our contractors, Terra Firma Wales, were on site conducting specific studies from spring 2025.

What are ground investigations?
Ground investigations are the checks and tests carried out on the land where a wind farm is planned. They help engineers understand what the ground is like so they can design safe and stable foundations for the turbines and other infrastructure.

Think of it as “testing the ground before building anything heavy on it.”

Completion of
Planning Discharge.
2026
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Completion of
Planning Discharge.
2026

What are planning conditions?
When a wind farm gets planning permission, the approval usually comes with a list of rules that the developer must follow. These rules are called planning conditions.  They are added by the local planning authority to make sure the wind farm is built and operated in a way that:

  • protects the environment
  • keeps people safe
  • respects nearby communities
  • ensures the project is built properly and as agreed

Think of them as “you can build this, but only if you do these things too.”

Procurement of turbines,
construction contracts
and associated electrical
and civil engineering work.
Throughout 2025 into 2026
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Procurement of turbines,
construction contracts
and associated electrical
and civil engineering work.
Throughout 2025 into 2026

We procured several suppliers to help us build Twyn Hywel Energy Park:

  • Knights Brown – civil engineering works
  • H&MV Engineering – electrical infrastructure
  • Nordex – wind turbine supplier
Current PhaseConstruction begins. June 2026
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Construction begins.June 2026

Construction begins on site to build Twyn Hywel Energy Park – including access tracks and foundations.

Keep up to date by visiting the construction hub.

First export of clean,
green energy to
the National Grid.
2027
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First export of clean,
green energy to
the National Grid.
2027

Supporting local communities

We’re committed to ensuring Twyn Hywel Energy Park not only benefits the environment but also the local community. Our Community Benefit Fund will invest up to £703,500 each year into local projects throughout the park’s operational life, creating long-term value for everyone involved.

Find out more about our community investment plans