Projected for a 2031 completion date, the third nuclear plant at Sizewell could produce 7% of the UK's electricity supply

Sizewell C nuclear power plant

An artist's impression of Sizewelll C nuclear power station in Suffolk (Credit: EDF)

Sizewell Point C looks set to be the latest nuclear power station to be built in the UK  – but getting work underway hasn’t been without its difficulties.

Proposed by EDF Energy – the French state-controlled electricity company that is also building the identically-designed Hinkley Point CSizewell C would be the third nuclear plant on the Suffolk coast.

While the £16bn ($21bn) scheme has been plagued with funding challenges that have delayed construction from beginning, reports suggest a planning application is almost ready to be submitted.

If Sizewell C does go ahead, the 32-hectare site  will operate alongside Sizewell B – its predecessor nuclear power station located south of the new site – and the Sizewell A plant that is being decommissioned, with an estimated completion date of 2031.

EDF Energy claims it will provide about 7% of the UK’s electricity supply – enough to power six million homes – and contribute to the country’s 2050 net zero ambition by saving nine million tonnes of carbon emissions each year.

It also expects to offer a boost to the local economy through contracts and employment, but issues over the funding and construction costs have put the development in doubt at times.

Should the project fall through, it would be a significant blow to Britain, which needs to replace its ageing nuclear stock as a low-carbon source in a secure and affordable future electricity supply for the country.

Other proposed nuclear developments like Moorside, in Cumbria, and Wylfa Newydd, in Wales, have been halted due to funding problems, leaving Sizewell as the only project after Hinkley close to being built.

NS Energy takes a look at the capacity of the Sizewell C nuclear power station, its expected economic benefits and the challenges its faced.


What is Sizewell C? The reactors and capacity of nuclear power station

Picture: EDF, Sizewell C
Sizewell C will be almost identical to the Hinkley Point C nuclear power station project, pictured (Picture: EDF)

The Sizewell C nuclear power station will be almost identical to the Hinkley Point C power station, which is forecast to come online in 2025. It is being built in Somerset by EDF Energy and its Chinese partner China General Nuclear Power Group (CGN).

Sizewell C will be made up of two European pressurised reactor (EPR) units – technology that EDF and CGN have also deployed at Hinkley Point C and the Taishan nuclear power station in China.

It could produce 3.2 gigawatts (GW) of electricity at full capacity, according to EDF Energy’s proposal.

The combined energy generated by the existing Sizewell B power station and Sizewell C is estimated to meet 10% of the UK’s energy requirements, with the bulk of that power set to come from the new plant.

The EDF proposal also claims the cost of connecting the power station to the national grid will be low as connections have already been put in place by planners.

Funding challenges put Sizewell C nuclear power station in doubt

Sizewell C
Sizewell C stage one exhibition (Picture: EDF)

EDF has predicted the cost of Sizewell C will be 20% lower than Hinkley Point C – which is set to cost about £20bn ($26bn) – because of the similarities between the stations and established infrastructure.

But in an interview with The Times in April 2018, the company’s UK chief executive Simone Rossi questioned whether the project would remain “feasible” without faster progress being made at the Hinkley Point C site – which has suffered from rising costs and delays – and a government guarantee.

The firm is still talking with the government about workable funding models that can convince it to stay at the table.

Speaking about the possibility of no functional funding model appearing, Mr Rossi said: “This is the year where we need to understand whether this whole thing is really feasible or not.

“If we were to conclude that maybe it’s not feasible, then at that point maybe we say we are not in a position to continue the project.”

In January 2020, it was reported that EDF was running out of time to secure a funding deal before the project became prohibitively expensive.

That’s because any funding delay cause a hiatus on the project, it would prevent the company from being able to transfer workers and equipment from the Hinkley development – thereby eroding the planned cost savings.

It’s been reported that using pension funds to part-fund construction of Sizewell C is one option being mulled over.

The government funding package has also yet to be finalised, with the findings of a consultation into alternative mechanisms still to be published.

One option being explored is the regulated asset base model, which is used to incentivise private investment into public projects by providing a secure payback and return on investment for developers.

EDF is seeking a different funding model for Sizewell C than the one in place for Hinkley Point C – which will cost consumers enormous sums as a contract between the UK government and the EDF-CGN partnership guarantees the energy firms a £92.50 ($120.40) megawatt-hour price for electricity generated at Hinkley Point C.

Trade union pushes for Sizewell C nuclear power station project go-ahead

The energy union GMB has called for the government to go ahead with plans for the Sizewell C project and other nuclear power station projects

During times when the Sizewell C nuclear power station project faced an uncertain future, energy union GMB has repeatedly urged stakeholders to go ahead with the power station.

It intervened after the National Infrastructure Commission (NIC) pushed for a rollback of the government’s plans to build a host of nuclear power stations – reportedly recommending only one of six proposed sites should be built in July 2018.

NIC chairman John Armitt claimed to be “agnostic” about whether Sizewell C was the chosen development.

In September 2018, GMB national energy secretary Justin Bowden said: “Starting with Sizewell C, Britain still needs at least five new low-carbon nuclear power stations if we are to meet our energy needs and reduce our dependency on foreign imports of power whilst ensuring we have the reliable electricity that comes from very low-carbon nuclear, and lower carbon gas, to complement our renewable energy sources.

“Hinkley Point C will provide secure, very low-carbon electricity for all the times in a year when the wind doesn’t blow and the sun doesn’t shine.”

The need for Sizewell C appears even more pressing after the demise of the Moorside and Wylfa Newydd projects.

There are 15 reactors in Britain, generating 21% of the country’s electricity – but almost half this capacity will be retired by 2025, with all but one offline by the mid-2030s.

GMB has argued the UK needs five new nuclear power stations to meet growing energy demands.


Sizewell C nuclear power station planning application to be submitted

On 17 February 2020, it was reported by The Telegraph that EDF was now close to completing a formal planning application for Sizewell C.

The development consent order is expected to be submitted to the UK’s Planning Inspectorate by March after the company has worked to address concerns about the site’s suitability, including around flood risk due to its low-lying coastal location between Ipswich and Lowestoft.

It could take a year for the application to be approved or rejected.

On EDF’s website, the company says it has completed four consultation rounds, with the next stage being the planning application submission.

Should it be approved, construction could reportedly begin by 2022.


Economic benefits of Sizewell C nuclear power station

EDF claims Sizewell C will create 5,600 construction jobs and 900 jobs when the plant is operational – an improvement on the 800 jobs at Sizewell B, which is said to be worth £40m ($52m) per year to the local area.

The energy firm also expects the power station to be a boost for East Anglian businesses – having received registers of interest from 1,300 businesses keen to work on the project as of late 2018.

Discussing the potential economic benefits of the power station in its proposal, East of England Energy Group chief executive Simon Gray said: “We know that 3,000 UK companies were involved in the construction of Sizewell B, with nearly 700 of them based in this region.”

Suffolk Chamber of Commerce chief executive John Dugmore added that the identical Hinkley Point C involved contract work worth more than £435m.

In November 2018, a seminar about supply opportunities at Hinkley Point C in Braintree, Essex, encouraged businesses in Essex and Suffolk to obtain experience from working on this project to stand them in good stead for future schemes like Sizewell C.

EDF would treat the two counties as a single local market for both projects as their construction periods ill overlap.

Robert Edge, inward investment manager at Invest Essex – the inward investment and business support agency – said: “Business doesn’t see a county border, just opportunities.

“It’s a challenge for both Essex and Suffolk to maximise the supply opportunities.”