Successful candidates may be based in any of our office locations – Cardiff, Glasgow, or London. We especially welcome applicants from Cardiff and Glasgow.
Hybrid working – on average, currently one day per week in the office, or approximately 20% of the month.
Job summary
Ofgem is Great Britain’s independent energy regulator. Our primary responsibility is to protect energy consumers, especially the most vulnerable, while at the same time working with government, industry and consumer groups to deliver a clean, more affordable and secure net-zero energy system at the lowest cost to consumers, and to support economic growth.
We are now seeking two Senior Economic Modellers – Energy Systems to join our Strategy, Economics, Research and Net Zero directorate. This is a unique opportunity to be at the forefront of Ofgem’s growing modelling capability, helping to build and apply an industry‑standard energy system model to inform some of the most important regulatory and investment decisions shaping the UK’s transition to Net Zero.
In this role, you will play a central part in establishing and embedding Ofgem’s new energy system modelling tool, expected to be an industry-standard platform such as BID3 or PLEXOS. You’ll run, interpret and present modelling outputs that directly inform policy, regulatory design and long‑term system planning. Your work will support major programmes across networks, flexibility, system operation and decarbonisation – helping ensure decisions are grounded in clear, well-evidenced analysis.
You will collaborate closely with experienced economists and analysts to shape our modelling approach and ways of working, including assumptions, scenarios, sensitivity analysis and quality assurance. You’ll apply your quantitative skills not only to system modelling but also to wider economic analysis where needed, producing high‑quality advice and clear, accessible outputs for senior decision‑makers.
Strong communication skills will be key, as you translate complex modelling insights into clear recommendations for a broad range of audiences. You will also work with colleagues across Ofgem to help turn policy and regulatory questions into well‑defined analytical tasks, ensuring modelling is targeted, relevant and impactful.
Collaboration is at the heart of this role. You will work with policy and analytical teams across Ofgem, as well as engaging external stakeholders including government, the National Electricity System Operator and academic or industry experts.
You will be part of Ofgem’s well‑established economics and analysis community, benefiting from strong peer networks, professional development and opportunities to broaden your skills. As the modelling capability matures, you’ll also have the chance to contribute to cross‑cutting projects where your expertise adds value.
Key Responsibilities
You will work alongside economists, analysts and other technical specialists to shape Ofgem’s modelling approach, including scenario design, sensitivity analysis and proportionate quality assurance. You will also apply your quantitative skills to wider economic analysis where needed. You will produce clear drafting for internal and external audiences, including briefings and consultations, supported by strong project management and a focus on reproducible, well-documented analysis (including version control and repeatable workflows where appropriate).
You will work alongside experienced analysts and economists to shape Ofgem’s modelling approach, ensuring it is robust, and proportionate to the question at hand, and apply your quantitative skills to wider economic analysis beyond system modelling where needed. You will provide clear, concise drafting for internal and external audiences, including contributions to briefings, internal decision documents, consultations and other outputs, supported by strong project management and quality assurance to ensure timely, high-quality delivery. You will help embed good analytical practice, including transparent documentation of assumptions, version control and repeatable workflows.
You will build constructive working relationships with internal and external stakeholders and work collaboratively across teams to plan and deliver outputs effectively.
Key Outputs and Deliverables
In this role you will contribute to building and embedding Ofgem’s energy system modelling capability, while delivering high-quality analysis that supports key regulatory and policy decisions. Working as part of a team, you will be expected to:
- Support capability build and model deployment: Contribute to the in-house deployment of an established energy system model, including helping shape the practical workflows, documentation and governance needed to use it effectively.
- Develop model-specific expertise: Where relevant, upskill in energy system modelling tools and approaches (for example BID3 or PLEXOS), with training and support, and apply this learning quickly in delivery. Direct prior experience with these tools is welcomed but not required.
- Deliver decision-ready energy system modelling: Run and interpret modelling to answer priority questions for Ofgem and the energy transition, producing outputs that are robust and proportionate to the decision context.
- Provide analytical advice across Ofgem: Apply your quantitative and economic analysis skills to support teams across the organisation, translating complex evidence into clear recommendations for a range of audiences.
- Maintain high analytical standards: Ensure analysis is quality-assured and reproducible. Critically assess evidence, articulate what it can and cannot tell us, and identify key risks and mitigations.
- Collaborate with technical experts: Work closely with economists, analysts, and other technical colleagues to deliver a coherent work programme and build expertise across the modelling community.
Person specification
Please ensure you demonstrate clearly within your answers to the application questions, how you meet each of the criteria below (no more than 1250 words).
In the event of receiving a large number of applications an initial sift may take place on just the identified lead criteria indicated below.
Essential Criteria:
- Complex quantitative modelling experience (LEAD): Demonstrable experience developing, running and interpreting complex quantitative models to inform real-world decisions in energy and/or other infrastructure/market settings. This could include energy system, power market, network, dispatch/optimisation, investment appraisal, or other large-scale analytical modelling.
- Analytical judgement and quality assurance: Ability to produce robust, transparent and reproducible analysis: selecting appropriate methods, documenting assumptions, quality assuring outputs, and communicating uncertainty/limitations and risk mitigations.
- Communication: Strong ability to distil complex technical material into clear, decision-ready messages for different audiences (both written and oral), with excellent drafting skills.
- Stakeholder engagement: Experience working collaboratively with a wide range of stakeholders (technical and non-technical), building constructive relationships and influencing outcomes through evidence.
- Delivery and organisation: Ability to plan and prioritise competing tasks, manage timelines, and deliver high-quality outputs in a fast-paced environment.
Desirable Criteria:
- Energy system / market modelling exposure: Familiarity with electricity market or energy system modelling approaches and/or tools (for example PLEXOS, BID3, Aurora, or similar), or demonstrable capability to learn and apply such tools quickly.
- Sector knowledge: Experience or working knowledge of GB gas and electricity markets and market arrangements.
- Technical skills: Proficiency in analytical language (e.g. Python, R, SQL,
Benefits
Alongside your salary of £47,895, OFGEM contributes £13,875 towards you being a member of the Civil Service Defined Benefit Pension scheme. Find out what benefits a Civil Service Pension provides.
Apply before 11:55 pm on Tuesday 7th April 2026
