Senior Commercial Manager in London

Sizewell C’s business is to design, finance, construct, commission, operate, maintain, and eventually decommission the nuclear power plant and related infrastructure at Sizewell C in Suffolk. Overall, whilst the Company is in the construction phase, the Boards’ principal focus is on the development and construction of Sizewell C on time, on budget and to the highest quality and safety standards. The Company is maturing to meet all these requirements.

Sizewell C is economically regulated by OFGEM under the Regulated Asset Base (RAB) model similar to other UK electricity distribution networks and Thames Tideway. Sizewell C construction strategy is to replicate the design of Hinkley Point C, using the majority of the same supply chain, but innovating in the way it is delivered to achieve savings in time and cost of around 20%. The CCO will need to be guided by and incorporate lessons learned from the Hinkley Point C commercial delivery to achieve Sizewell C’s ambition.

Following Financial Completion and Revenue Commencement, Sizewell C is fully funded and is owned by; The Secretary of State for Energy Security and Net Zero representing HM Government, La Caisse, Centrica, EDF and Amber Infrastructure. Sizewell C is entering an exciting phase of growth as we mature into an independent organisation and continue building one of the UK’s largest and most important energy projects.

Location: London, hybrid basis with travel required.

Contract: Permanent, full-time.

Closing Date: Friday 3rd July 2026

What’s in It for You

• Bonus: 5% annual incentive
• Pension: Up to 7.5% employee / 15% employer contribution

Role Purpose

The role requires strong collaboration within an alliance environment, combining effective stakeholder engagement with the ability to provide robust commercial challenge in a fast-paced and complex delivery setting. Responsible for the review and assurance of Annual Actual Cost Forecasts (AACF), alongside the assessment and validation of profit due to Civil Works Alliance in accordance with Project Alliance Agreement (PAA) incentivisation arrangements, ensuring outcomes are consistent with agreed AACF positions, cost performance, and contractual principles. The role ensures that forecast cost positions, commercial reporting, and incentive outcomes are accurate, transparent, and aligned with contractual and governance requirements, while driving improvements in data, reporting, and process efficiency.

Key Responsibilities

• Review, challenge, and lead on the agreement of AACF submissions, ensuring forecasts are robust, evidence-based, and aligned with cost, delivery, and risk positions.
• Assess and validate forecast movement and cost trends, ensuring changes are clearly understood and appropriately reflected in the overall commercial position.
• Provide oversight and assurance of PAA commercial performance, including the production and validation of commercial performance reporting.
• Manage and assure profit incentivisation mechanisms, ensuring outputs are consistent with agreed forecasts and contractual principles.
• Provide commercial input on what should be paid based on agreed cost positions, forecast outcomes (AACF), and incentivisation adjustments.
• Ensure alignment across commercial, finance, and project controls data, including contractor submissions and client assurance positions.
• Drive the digitalisation of commercial processes through the use of data, automation, and reporting tools to improve efficiency, accuracy, and insight.
• Lead on the governance and audit processes, ensuring outputs are auditable, evidence-based, and compliant with PAA requirements.

Required Skills

• Effective communication skills, able to present complex commercial and performance information in a concise and structured manner to a range of stakeholders.
• Ability to operate effectively within an alliance, collaborative environment, with a strong "best for project" mindset.
• Comfortable working in a fast-paced, high-pressure programme environment, managing competing priorities and delivering to tight timelines.
• A strong analytical mindset with the ability to interrogate complex cost and performance data, challenge contractor submissions, and provide clear, evidence‑based commercial insight.
• Significant experience in commercial management within major infrastructure or civil engineering programmes.
• Experience in driving improvements in commercial reporting by digitalisation and data quality, including automation of manual processes, standardisation of outputs, and improved traceability.
• Strong capability in Excel at an advanced level to build, review, and manage forecast models, cost reconciliations, incentivisation calculations, and reporting packs.
• Experience using Power BI or similar tools for dashboarding and visualisation, and familiarity with systems such as SAP, CEMAR or Unifier.

Stakeholder Interface

Act as a key interface with the Project Management Office (PMO) team, working collaboratively to ensure commercial performance and reporting are fully aligned with programme controls and governance requirements.

Knowledge, Skills, Qualifications and Experience

• Member of RICS/ICE/CICES/IOB or equivalent professional body.
• Proven ability of working within a complex major project/programme environment in both procurement and post-procurement phases.
• Evidence of successfully undertaking complex procurements and of administering contracts.
• Effective Management and Leadership skills, with clear knowledge of best practice contract methodologies in the UK environment.
• Honed commercial skills and demonstrable ability to make sound decisions on complex matters (considering technical and commercial topics) of high financial value.
• Good understanding of procurement, contract performance measurement, risk management and change and claim management.
• Excellent negotiating, influencing and communication skills.
• Excellent problem-solving skills.
• Experience of working in a dynamic environment with multiple stakeholders.
• Experience of standard forms of contract (NEC and FIDIC) within the power/construction industry on complex major projects/programmes.
• Possesses skills to act as deputy.
• Educated to degree level.
• Familiar with the nuclear site licence conditions and the nuclear baseline philosophy.
• Understanding of the UK regulatory framework.
• Understanding of UK and international supply chain within the nuclear sector.
• Knowledge of English law and its impact upon the contract and commercial function.

Behavioural Competences

• Humility: Recognise the value brought from different cultures and experiences. Be open to other’s points of view and ideas, be willing to debate and to compromise.
• Positivity: Positively challenge poor quality and performance. Identify solutions at the lowest possible level. Encourage others to bring new ideas forward.
• Respect: Value the rules and environment in which we operate. Give and receive feedback with respect. Embrace and engage with new people and ideas. One team, working closely together and helping each other. Empowered teams always looking forward. Shared responsibility for delivery the project outcomes.
• Clarity: Communicate clearly and consistently. Promote collaboration and team alignment. Drive simplification at all levels.

If this sounds like the next step in your career, we’d love to hear from you. Apply today.

When joining Sizewell C, you may wonder why you are contacted by colleagues with an EDF email or see the EDF logo on portals that you access and/or documentation you receive; this is because we have partnered with EDF for the provision of a number of support services whilst we complete a successful transition out of the EDF group.

At Sizewell C we encourage and embrace diversity and how it can improve our experience and performance at work. It is a requirement that those who join us have the right to work in the UK. Whilst sponsorship may be a possibility that we can explore, we are fully committed to local recruitment where possible, and those already holding the right to work in the UK.

To be appointed to this role, you will need to meet the criteria for Security Vetting, which will, ordinarily, require you to have been a resident of the UK for at least three of the past five years.