Sizewell C is needed – but critical cost numbers are still missing | Nils Pratley

The UK government has committed £14 billion, bringing the total to almost £18 billion, to the Sizewell C nuclear power plant, signaling a significant step towards its realization, though a final investment decision is expected later this summer. While the government touts Sizewell C as a potentially cheaper alternative to Hinkley Point C due to a regulated asset base (RAB) financing model, the specific price per megawatt hour for Sizewell's electricity remains undisclosed, raising questions about whether it will indeed be substantially lower than Hinkley's guaranteed strike price of £92.50. Investors await clarity on pricing to assess the project's true value and impact on consumer energy bills, especially as offshore wind subsidies are expected to rise.

Analysis

The UK government's substantial financial commitment, escalating to nearly £18 billion with the latest £14 billion injection, significantly advances the Sizewell C nuclear project towards a final investment decision expected later this summer. This development underscores the strategic imperative to secure baseload, low-carbon electricity generation as existing nuclear capacity nears retirement in the early 2030s. A core element of Sizewell C's anticipated economic advantage over Hinkley Point C – whose developer EDF secured a £92.50 per megawatt hour strike price (2012 prices) – is the Regulated Asset Base (RAB) financing model, designed to lower capital costs by sharing construction and operational risks with consumers. Initial projections suggested Sizewell C's electricity could be priced in the £70-£75 MWh range (2012 prices). However, the conspicuous absence of any updated pricing information in the recent government announcement introduces considerable uncertainty. This lack of transparency regarding the actual cost to consumers is a critical concern, particularly as the project is touted as a cheaper replica of Hinkley Point C and as subsidies for alternative sources like offshore wind are anticipated to rise. The market impact is moderate, reflecting the project's long-term nature and the current informational gap, while the overall sentiment is mixed due to the positive funding news being tempered by the cautious outlook on cost transparency.

Key Decisions for Investors

• Investors should closely monitor the final investment decision for Sizewell C this summer, with particular attention to the disclosed electricity strike price and the specific terms of the Regulated Asset Base model, as these will be critical determinants of the project's financial viability and attractiveness.
• The success of Sizewell C in delivering electricity at a significantly lower cost than Hinkley Point C will serve as a crucial test for the RAB model's efficacy in large-scale nuclear projects; outcomes will likely influence investor appetite and government strategy for future UK infrastructure investments.
• Parties with exposure to EDF or the broader UK utility and energy infrastructure sector should assess the potential read-through from Sizewell C's cost and construction performance, as it will benchmark future nuclear project expectations and potentially impact valuations.
• Until definitive pricing and cost structures for Sizewell C are revealed, investors should factor the current uncertainty into risk assessments for UK energy projects, recognizing that the government's commitment alone does not guarantee favorable economic outcomes for private investors or consumers.