Nuclear for Wylfa the wrong way to go

Nuclear Free Local Authorities, 13th November 2025

Responding to today’s news that the UK Government intends to impose several so called ‘small modular reactors’ upon Wylfa, the Welsh NFLAs believe that this is the wrong way to go.

The money would be better spent on insulating Welsh homes to make them warmer and cheaper to run or used to develop more capacity in renewable technologies that can generate electricity cheaper and far quicker. And Ynys Mon can play a big part in that by becoming a centre of excellence for renewable technologies and so truly Wales’ ‘green energy’ island.

The Government’s nuclear delivery agency, Great British Energy – Nuclear recently concluded a ‘competition’ amongst SMR developers to select a preferred design. Unsurprisingly Rolls-Royce, which had already received a Government hand-out of £210 million during an earlier development stage and a Government hand-up by being fast-tracked onto the Generic Design Assessment process, won the competition. This was the equivalent of running a race with superior sports footwear, and starting the race much earlier, than the other participants. The company will now be awarded a further £2.5 billion of hard-pressed taxpayers money to build three pilot SMRs.

13th November 2025

Nuclear for Wylfa the wrong way to go

Responding to today’s news that the UK Government intends to impose several so called ‘small modular reactors’ upon Wylfa, the Welsh NFLAs believe that this is the wrong way to go.

Great British Energy – Nuclear also purchased the Wylfa and Oldbury sites off Horizon for £160 million for reuse as locations for these new SMRs, almost certainly at nil or minimal cost to the developer, and GNE – N recently advertised for a site manager with proficiency in the Welsh language letting slip that Wylfa was the preferred site.

The Government’s announcement refers to Wylfa becoming Britain’s first SMR ‘power plant’ with reactors plural, suggesting that the three initial reactors will all be co-located on the island. SMRs are an uncertain and unproven nuclear technology. The Rolls-Royce SMR design has yet to secure all the required regulatory approvals, no Rolls-Royce SMR have yet been built, let alone operated, and there is no experience of SMR modular assembly. Any reactor will not even come on stream until the 2030’s and even then will only deliver electricity for customers that is vastly more expensive than that generated by renewables. Nor has any permanent solution to the intractible problem of managing high-level radioactive waste been found, but there has been some academic research which indicates that many SMR designs create more waste per kilowatt generated than traditional gigawatt plants. And as Ukraine has demonstrated, nuclear power plants are obvious targets in any future conflict.

Wylfa is a particularly problematic location. The Horizon bid was rejected in part because of the damage it would cause to nature and the beautiful environment of Ynys Mon and its impact on the island’s linguistic heritage. But the bid failed largely because the developer felt they were not receiving enough financial support from the taxpayer. How will this be different? The price tag for a single SMR is likely to be at least £4 billion. Will a public subsidy of £2.5 billion be deemed sufficient to Rolls Royce to incentivise them to proceed with buiding three? How will electricity be transmitted across and out of the island? It is very likely that we shall see a sea of new pylons spring up across the green fields of Ynys Mon and beyond. If parts for a modular reactor are made off-site, how will they be transported onto the island? And with ‘First of a Kind’ experimental SMRs at Wylfa, and a military neighbour at RAF Valley, surely the UK Government is making Ynys Mons an even higher-priority target for terrorists or a hostile power in time of war. How will islanders be evacuated quickly and safely should there be an attack or an accident?

The promised thousands of jobs ‘for the local community’ must also be questionable. ………………………………………………………………………………………………

The Welsh NFLAs would rather see the £2.5 billion dedicated to SMR development at Wylfa redirected by the UK Government to reduce the energy bills of Welsh citizens and move closer to making Wales a wholly renewable electricity nation. How? By funding an emergency programme of retrofitting insulation to Welsh homes and into supporting renewable energy projects……………………………………………………………………………………………………………………… https://www.nuclearpolicy.info/news/nuclear-for-wylfa-the-wrong-way-to-go/