Sizewell C Just Got Planning Permission for a Factory in Bristol. It Says the Site Will Employ 400 People By 2028.
Estimated reading time: 4 minutes
In short. Sizewell C secured planning permission on 18 September 2026 for a precast concrete tunnel segment factory at Avonmouth Docks, Bristol, reusing the former Hinkley Point C production site [1]. The company says the site will employ up to 400 people once full production starts in 2028, up from 141 already working there [2]. The ledger logs an announced gain of 400, graded ANNOUNCED, sector energy, region South West, ai_cited: no, with review dates set for September 2027 and September 2028.
The factory will produce 38,500 precast concrete segments and tunnel heads for the three marine cooling-water tunnels that carry water to and from Sizewell C's Suffolk site [1]. Rather than building on a fresh site, the project reuses the Avonmouth facility built for Hinkley Point C's own tunnel segments, retaining existing infrastructure and drawing on a workforce with experience from that project [3]. Finished segments travel to Suffolk by rail and sea rather than road, part of Sizewell C's commitment to move the majority of construction materials off the motorway network [2].
What is already there, and what is promised
Early works are under way ahead of full production. Sizewell C's delivery partner, the Civil Works Alliance, already employs 55 people on site, alongside 86 supply chain workers, 141 in total [2] [3]. That is the reported, present-tense figure. The 400 figure is different in kind: a target for "full production," which is not expected to begin until 2028, subject to planning conditions being met [1]. Sizewell C chief executive Nigel Cann framed the announcement around the wider project's approach to off-site manufacturing: "Manufacturing our pre-cast concrete components off-site and delivering them by rail and sea means the benefits will be felt in our host community too" [3]. Bristol North West MP Darren Jones welcomed the news for his constituency: "I'm delighted to hear that a sizeable number of these Sizewell C skilled jobs are coming to Avonmouth in my constituency" [2].
How the ledger logs it
An announced gain of 400, graded ANNOUNCED, sector energy, region South West, ai_cited: no. This is a construction-phase jobs promise, not a headcount return: 141 people currently on site is the reported, present number; 400 is the "up to" target this ledger tracks against a 2028 start date for full production. Both the "up to" framing and the planning-permission stage rather than a completed build put this squarely on the ANNOUNCED side of the line, alongside this ledger's other construction and energy-sector promises.
What happens next in this ledger
Review dates are set for 18 September 2027 and 18 September 2028, matching this ledger's standard twelve and twenty-four month checks; the second date lands close to when production itself is meant to start, so the sharper test of the promise is likely to fall on the following review. Watch this row against the 141 currently on site: the gap between that figure and 400 is exactly what these reviews exist to check, whether Avonmouth's headcount climbed on schedule or the promise slipped. Sizewell C has made other UK jobs announcements this year, including a separate facilities-management contract also framed around 400 roles; that is a different promise, at a different site, and is not logged in this row.
Sources
- Construction Enquirer, "Sizewell C gets green light for Bristol tunnel segment factory," 18 September 2026. https://www.constructionenquirer.com/2026/09/18/sizewell-c-gets-green-light-for-bristol-tunnel-segment-factory/
- Nuclear Industry Association, "Sizewell C secures planning approval for production facility," 22 September 2026. https://www.niauk.org/sizewell-c-secures-planning-approval-for-production-facility/
- The Construction Index, "Sizewell C to re-use Hinkley tunnel segment site," 18 September 2026. https://www.theconstructionindex.co.uk/news/view/sizewell-c-to-re-use-hinkley-tunnel-segment-site