Commercial Assistant

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. We’re looking for motivated a delivery‑focused Senior Project Manager with experience in large‑scale infrastructure, engineering or complex construction environments.

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. We are now recruiting the below position.

Commercial Assistant

Location: London

Contract: Permanent, full-time. 

Closing date: Thursday 23rd July 2026

What’s in It for You 

• Salary: £30,127-38,000 depending on experience

• Bonus: 5% annual incentive 

• Pension: Up to 7.5% employee / 15% employer contribution 

• Leave: 28 days holiday plus bank holidays 

The Opportunity:

Join a friendly, diverse, and high-performing team directly involved in Europe's biggest construction project - delivering a reliable, low-carbon energy supply for decades to come. As Project Support Administrator, you'll provide essential support to the SZC Contracts and Procurement Team, working with senior stakeholders whilst maintaining the highest standards of integrity and confidentiality:

Key Responsibilities

• Divisional / Departmental support.

• • Provide high level administrative support to the head of commercial.
  • Duties include complex diary and email management, preparing briefs and presentations, coordinating cross departmental communications and ensuring smooth daily operations of divisional office.
• Assist the secretariat for monthly Commercial Approval
  • Assist the secretariat for the bimonthly Commercial Approval Committee (CODEM). This includes collating and distributing papers, ensuring submissions have correct authorisations, recording minutes and actions, and following up on decisions. The role acts as the deputy secretariat function for CODEM.
• Assurance, Audit & Regulatory administration
  • Provide support to the assurance, audit, and regulatory compliance activities. Responsibilities include preparing documentation for audits, maintain registers (e.g risk, actions, tracking deadlines for submissions and organising evidence for internal / external reviews.
• Team Coordination
  • Maintain and Build relationships with key contacts and stakeholders
  • Maintain confidentiality of all commercial and personal information
  • Maintain data/records so that information is readily available and easily accessible
  • Arrange meetings and co-ordinate the booking of rooms, arrange travel, accommodation, pool/hire vehicles and hospitality as required
  • Creation of presentations and reports for the wider team
  • Support to document management lead – management of the transfer of information to

The successful candidate will be confident in working with many different people, you will also interface with other teams across the SZC Project, such as Finance, supply chain and Site delivery.

The role is mostly desk based, with some hybrid working arrangements with the office based in London, so it requires lots of time in Teams calls and using on-line communications.

Skills & Attributes:

The ideal candidate will be:

• Excellent communication skills and attention to detail.
• Ability to build positive relationships with stakeholders at all levels.
• A proactive approach and willingness to learn.
• Strong organisational skills and ability to manage competing priorities.
• Proficiency in Microsoft Office (Excel, Word, PowerPoint).
• Good understanding of Power BI and other reporting tools
• Able to organise their own time and others, working in an environment where priorities and requirements can change quickly.
• Able to work largely unsupervised, and confident in personal organisation.
• is comfortable talking to a wide range of people at lots of levels in a large organisation.

Other Details:

• Location can be based in London or hybrid working with routine trips to London and occasional visits to Site.
• Full-time 37 hours per week.
• Laptop will be provided.
• Requires BPSS security vetting.

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.

Solidarity

• 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.
• Clearer and faster decision making.
• 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.