Hinkley Point C: Building Britain's first nuclear reactor in 30 years

Original Article ↗ Hacker News Discussion ↗

Financing, Cost Overruns, and Foreign Exposure

  • Hinkley Point C (HPC) costs have risen from £18bn to £31–35bn in 2015 prices (£46bn today), a 75–100% overrun.
  • China’s CGN stopped funding amid worsening UK–China relations; EDF (now fully nationalised) and thus French taxpayers are covering overruns.
  • The UK government refused extra construction support but has guaranteed a 35‑year Contract for Difference (CfD) strike price, creating long‑term above‑market revenue for the operator.
  • Debate over whether this is a “win” for the UK (foreign taxpayers funding UK infrastructure) or a bad deal for France, given fixed-price nuclear contracts’ history of overruns.

Nuclear vs Wind/Solar: Cost, Reliability, and Lifetime

  • Multiple comparisons to Dogger Bank offshore wind (3.6 GW nameplate, ~45–55% capacity factor) suggest it is roughly comparable in annual output to HPC’s 3.2 GW baseload, but over a shorter 20–25 year life.
  • Some argue even “catastrophically expensive” nuclear is still cost‑competitive with large offshore wind plus backup; others argue current offshore wind and solar are already cheaper and improving faster.
  • Capacity factor and correlation matter: nuclear is high and predictable; wind output is lower and highly correlated across sites, requiring backup or storage.
  • Decommissioning costs for nuclear are estimated in the low single £/MWh range in cited studies; some remain skeptical that reserves will be sufficient in practice.

Storage, Grid Integration, and Imports

  • UK grid-scale batteries: ~4.6 GW / 5.9 GWh today, projected to grow quickly; useful for minutes–hours, not yet for multi‑day or seasonal gaps.
  • Some claim a renewables mix (wind, solar, hydro) with moderate storage and demand shifting can largely replace nuclear and gas; others argue week‑long “dunkelflaute” and winter peaks make massive storage uneconomic.
  • Pumped hydro potential and hydrogen are mentioned but seen as constrained or technically/economically uncertain.
  • Interconnectors and imports help but share weather risks with neighbouring North Sea countries.

Project Complexity, Learning, and Design Choices

  • HPC is a heavily customised, first‑of‑a‑kind EPR in a country with a largely lost nuclear workforce, cited as a core driver of delay and overruns.
  • EPR is widely viewed as over‑engineered (e.g., quadruple active cooling); France is pivoting to a simplified EPR2, but the UK is sticking with its current EPR variant.
  • Advocates argue later units (HPC2, Sizewell C) could be 20–30% faster and cheaper via learning effects; skeptics note similar promises were made before and see nuclear as a “once‑a‑generation” industry that keeps forgetting.

Role of Nuclear in UK Strategy

  • Supporters see HPC and Sizewell C as valuable for:
    • Firm low‑carbon capacity uncorrelated with wind/solar.
    • Maintaining a skilled civil nuclear workforce that also underpins the nuclear navy and, indirectly, military capability.
  • Critics argue HPC will be operational only after renewables plus storage have already transformed the UK grid, making it an expensive relic and undermining appetite for future large plants.
  • Small Modular Reactors (SMRs) are floated as a more politically viable path for any additional UK nuclear build‑out.

Skills, Apprenticeships, and Industrial Base

  • The project’s ~1,300 apprenticeships are praised as high‑quality upskilling but also seen as modest given the UK’s size and weak practical/vocational education system.
  • Commenters stress that losing and then rebuilding nuclear skills is itself a major hidden cost of stop‑start nuclear policy.