Report on nuclear power in Wales is so secret the UK Government won’t even disclose its name

Martin Shipton

A campaigner wanting to find out how power from a possible new nuclear power plant on Anglesey would be channelled into the national grid has been refused all information, including even the name of an official report on the matter.

Dr Jonathan Dean, a trustee of the Campaign for the Protection of Rural Wales, wrote to the UK Government’s Department of Energy Security and Net Zero (DESNZ), asking: “Please could I get a copy of the evaluation report where it was concluded that Wylfa on Ynys Môn should be selected as the next large nuclear site after Sizewell C.”

His request was rejected. He wrote back stating: ”I wondered if it would be possible to obtain a redacted copy of the report you mention. I have little interest in any commercial details. Ideally the whole report suitably redacted, but at least those sections dealing with the connection to the national grid; use of waste heat as per section 4.8 of national policy statement EN-1; location and area of land considered on Ynys Môn; and means of overcoming the many reasons given by the Planning Inspectorate in their recommendation to the Secretary of State in 2019/2020 to refuse the DCO [Development Consent Order] application made by Horizon Nuclear Power.

“Would it be possible to know the title and any reference number for this report to aid future requests?”

 Confidential information

He was then told: “The report has been withheld in full under regulation 12(5)(b) of the Environmental Information Regulations 2004 and no part of the report is available for disclosure … [The] report does not have a reference number and the title of the report is confidential information.”

Later the Department said it had quoted the wrong section of the regulations as the reason for turning down Dr Dean’s request . The correct section was regulation 12(5)(e), which states: “(The) confidentiality of commercial or industrial information where such confidentiality is provided by law to protect a legitimate economic interest.”

Dr Dean told Nation.Cymru: “There have been tentative ideas to connect the transmission grid in north Wales to that in the south since at least 2009 that I am aware of. Then the idea was a subsea connection from Wylfa to Pembroke And back in 2012 NGET [National Grid Electricity Transmission] wanted to build a 400 kV transmission line to Lower Frankton from Cefn Coch to service mid Wales wind farms.

“The Offshore Transmission Network Review in 2020 again suggested a subsea connection linking Lancashire to Wylfa to Pembroke, taking in the new Irish Sea wind farms.

“The Holistic Network Design (HND) of 2022 changed things. It brought power subsea from Scotland into Pentir (Bangor) and took power from Pentir to Swansea North substation. Although heavily caveated as just indicating a network need, and not indicating technology or route, it was described as a ‘double circuit’ which could be interpreted as meaning pylons.

“In the ‘Beyond 2030’ report this year the ESO [Electricity System Operator] says that the subsea link into Pentir will be double the capacity (4 GW?) of that in the HND, but interestingly show the extra capacity connecting to Bodelwyddan not Pentir.

“Meanwhile NGET have planned a substation at Gwyddelwern, supposedly for north Wales wind farms, and Llandyfaelog for mid Wales wind farms.

“Last week, the Beyond 2030 Celtic Sea report revealed Llandyfaelog will be one of the landing points for the Celtic Sea wind farms, and that Swansea North substation has no free capacity or space to expand

“Pentir is constrained ‘behind’ both Eryri and the new north east Wales national park (currently Area of Outstanding Natural Beauty). If all the capacity from Scotland came into Bodelwyddan and headed south from there, depending on the final limits of the new national park, there may be no obvious hard constraints to pylons.

“So what might be possible? The line could go down the vale of Clwyd, maybe via the new substation in Gwyddelwern, to Cefn Coch (previously desired substation site) then Newtown (132 kV link), Builth and down the Tywi to the new substation in Llandyfaelog.

“Vyrnwy Frankton wouldn’t be needed, Tywi Usk wouldn’t be needed, and with a bit of re-jigging, Teifi Tywi wouldn’t be needed. Technically it would be a far superior transmission solution (at least the correct transmission voltage!) with up to 6 GW capacity and meet the HND objectives of linking north to south Wales. It would likely be 50m pylons carrying 400 kV double circuits.

“If there wasn’t the desire to extract wind power from mid Wales, the alternative could be a HVDC [High Voltage Direct Current] ‘bootstrap’ from Pentir to Pembroke (as per 2009). The two double circuit lines out of Pembroke can carry 12 GW so can easily accept 6 GW from north Wales (4 GW of it from Scotland) and 3 GW from the Celtic Sea, while still having space for the 2 GW Pembroke power station which will, apparently, be converted to hydrogen and/or carbon capture.

“But this is just my feverish imagination. We will have to wait and see.”

Grid connection

Responding to the UK Government’s secrecy over the transmission link from Wylfa, Dr Dean said: “I have always had an interest in Wylfa as I brought my family to Ynys Môn in the 1960s. I remember going to one of the first public meetings about Wylfa B in 1976 to hear my father talk.

“When Hitachi were developing the last iteration of Wylfa B I was involved with the campaign to have the grid connection put underground or subsea. This campaign was supported by Albert Owen, Rhun ap Iorwerth and then Virginia Crosbie. However Hitachi refused to consider a subsea connection and National Grid refused to consider a buried connection

“The Hitachi proposal was ultimately recommended for refusal by the Planning Inspectorate for multiple reasons. Knowing the north Wales grid will be so constrained by 2030, due to the growth of renewables, so much so that pylons are required from Bangor to Swansea, I was shocked at the announcement of a GW scale station. I had expected a series of SMRs [Small Modular Reactors]. There will be no spare grid capacity in the whole of north Wales for nuclear.

“As trustee of CPRW I was concerned that a new line of pylons would be put through Eryri, against UK planning policy, as there is no way around the national park other than under the sea. The UK. planning policy for nuclear has never considered grid connections, so I assumed that the DESNZ report must have addressed this. A power station without a grid connection would just be an enormous white elephant

“I still don’t understand why such technical details should be withheld from the public, given there was a very clear announcement the power station would happen. The fact the report has a ‘secret’ title, and no reference number, makes me think it doesn’t actually exist! But I cannot believe governments announce new power stations based on no analysis or consideration. Surely not?

“All I want to know is, will it be a subsea cable or more pylons all the way to Connah’s Quay? I really don’t see the need for such secrecy.”