Pembrokeshire Substation

Pembroke Substation is a substation in the Southwestern part of Wales, near the shore of Pembrokeshire.

The substation is also a Grid Supply Point (GSP) as it has transmission components that allow it to step down a 400 kV to 132 kV grid for distribution to Milford Haven.

The substation is owned and operated by The National Grid Electricity Transmission PLC and is connected to Swansea North Substation via 400 kV transmission lines.

Where is Pembrokeshire Substation?

Pembroke Substation is located in the county of Pembrokeshire in the South-Western part of Wales, an area surrounded by St. George Channel and Bristol Channel to its North and South.

The county also has the Celtic sea to the west and is home to Pembrokeshire Coast National Park.

The substation is adjacent to the former Pembrokeshire power station.

What are the wind farms near the Pembroke Substation?

Erebus floating wind farm’s export cables make landfall in Milford Haven, which will then go through a cable route to a new substation near Pembroke.

Blue Gem wind is the joint venture between Simply Blue Energy and TotalEnergies to pioneer the 96MW wind farm, Erebus, in the Celtic sea 45 km off the coast of Pembrokeshire. The wind farm will go online by 2026.

From Milford Haven and onto the new substation, the electricity from the Erebus Wind Farm will connect to the Pembroke Substation and link to the 400 kV national grid.

Who operates the Pembrokeshire Substation?

Pembroke substation is owned and operated by the National Grid Electricity Transmission plc.

What is the Greenlink Interconnection project?

Greenlink Project is an interconnection project that will connect the Pembroke Substation to the Great Island substation, County Wexford in Ireland, via 500MW subsea cables and underground cables from the landfall site to the converter stations.

The project is a significant move between the energy markets of the United Kingdom and Ireland, as the electricity can flow in both directions depending on demand.

The capacity of the project is 500 MW, which will include two new converter stations—one at the Great Island Substation and one at the Pembroke Substation.

The power cable capacity is 320 kV and spans up to 160 km of sea cables and 22 km of underground cabling.

The Pembroke Substation will also get an upgraded 400 kV gas-insulated switchgear to connect it to the Greenlink Interconnection.

Onshore construction had begun in March of 2022, shortly after financial closing.

Public consultations with community stakeholders were held and completed in 2019. Planning permission was granted to the Pembrokeshire county council, United Kingdom, and County Wexford council, Ireland.

The £400m project, the first interconnecting project to be privately financed, is expected to be commissioned by 2024. European Union also co-financed the start of the project via a £7.4 million grant from the Connecting Europe Facility (CEF) in 2018.

Element Power and Partners group are partners in the project, with Partners Group the company promoting the project.

Is there another substation in Pembrokeshire?

Haverfordwest Substation is a substation in Pembrokeshire with 33kv and 11kv transformers owned and operated by Western Power Distribution.