Security of Supply Modelling Specialist - NESO

National Grid plc; Warwick; Hybrid; GBP 55,000 - 70,000; Full time

Job summary

A role as a Security of Supply Modelling Specialist is available at a leading energy systems operator. Candidates will spearhead innovative modelling practices to ensure the energy security of Great Britain, engaging with key stakeholders and leading analysis to support government initiatives. This is a full-time position based in Warwick with flexible working arrangements.

Benefits

Bonus based on company performance

26 days annual leave

Competitive contributory pension scheme

Career-development resources

Diverse and inclusive community

Qualifications

• Experience in statistical, probabilistic or numerical modelling.
• Experience in energy market modelling preferred.
• Strong PLEXOS experience beneficial.

Responsibilities

• Lead modelling for the annual Electricity Capacity Report.
• Develop bespoke in-house energy market models.
• Engage with stakeholders including DESNZ and Ofgem.

Skills

Statistical modelling

Analytical skills

Interpersonal skills

Coding in Python

Coding in R

Knowledge of electricity markets

Tools

PLEXOS

Job description

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Title: Security of Supply Modelling Specialist - NESO

Location:

Warwick, GB, CV34 6DA

Job Type: Full Time

Requisition Number: 67115

Department: ESO

Job Function: Strategy

Description:

About the role

National Energy System Operator (NESO) recognises the potential of bright and talented individuals, and we encourage you to join us as Great Britain’s energy system undergoes an ambitious, exciting, and vital transformation. Together with industry, we are creating a cleaner, more sustainable energy future.

We’re looking for passionate and skilled Security of Supply Modelling Specialists x4 to join our Energy Security Modelling team. The team play a pivotal role in ensuring the energy security of Great Britain. We develop cutting-edge modelling to provide expert advice to Government on critical decisions related to security of supply, policy targets and future policy development.

Three successful candidates will lead the design and development of bespoke in-house energy market models, supporting key obligations relating to target capacity recommendations for the Capacity Market auctions. The fourth will join our team of PLEXOS experts, focusing on modelling the contribution of interconnectors to security of supply. All roles offer the freedom to innovate—driving forward methodologies and enhancements that keep our modelling world-class and fit for the future

This isn’t just modelling, it’s mission-critical work. We speak directly to government to inform decisions on how much electricity capacity to secure through the GB Capacity Market—currently worth around £3 billion annually. You’ll be helping to answer questions like: How much electricity capacity do we need five to eight years from now? What mix of technologies will keep the lights on through the energy transition?

You’ll lead the development of cutting-edge modelling, shape the annual Electricity Capacity Report, and engage with key stakeholders including DESNZ, Ofgem, and the Panel of Technical Experts. You will bring fresh thinking to how we model uncertainty, risk, and resilience in a rapidly evolving energy landscape

This role will be based in Warwick (we also have our Wokingham and Glasgow offices, you would expected, where possible, to travel to Warwick or other locations for specific in-person collaboration events). We continue to offer hybrid working from office and home. This is a full-time role, and we offer flexible working arrangements.

About us

National Energy System Operator’s (NESO) mission is to facilitate the decarbonisation of Great Britain’s energy network and ensure the delivery of reliable, affordable, and clean electricity for consumers. We work with stakeholders across the whole energy industry to plan for future network needs, using a wider adoption of technology and changes in consumer behaviour, as well as ensuring we have the right markets, networks, and frameworks in place, to transform the way we operate tomorrow.

Join us, and let’s energise progress.

energy, our future, together.

About the National Energy System Operator (NESO)

In Autumn of 2024, the ESO transitioned to National Energy System Operator, or NESO for short. Previously denoted as the Future System Operator (or FSO), the new National Energy System Operator is the independent body responsible for planning Great Britain’s electricity and gas networks and operating the electricity system.

The ESO, including all of its existing roles, are now at the heart of the new National Energy System Operator. As NESO, we will build on our existing roles, capabilities, and ways of working significantly to create an organisation the energy system and its users’ need. Our new capabilities will enable us to look across vectors, including electricity, natural gas and hydrogen, and crucially consider the trade-offs between them.

The organisation is set up as a public corporation with its own Board of independent directors, with complete operational independence from government, the regulator and any and all commercial interest. As was the ESO, NESO will be licenced and regulated by Ofgem through price control agreements and obligated to identify optimal solutions to system operations and planning in the most sustainable, affordable and secure way for all.

Key Accountabilities

• Leading modelling to provide recommendations to Government through our annual Electricity Capacity Report
• Lead modelling improvements through a set of development projects that are determined through our annual project prioritisation process.
• Lead modelling on the contribution of different technologies through their Capacity Market de-rating factors.
• Lead modelling to support recommendations to Government on the Capacity Market target, informed by analysis of different supply and demand scenarios, as well as prevalent risks to security of supply.
• Lead data management and assurance processes to ensure modelling remains accurate and robust, identifying and obtaining new data where appropriate.
• Build effective relationships and communicate modelling activities to key stakeholders, notably DESNZ, Ofgem and the PTE, to promote transparency and ensure our results are trusted.
• Produce analysis, including clear visualisations, of modelling results that quickly provide stakeholders with the key messages they need to act on methodology or policy decisions.
• Use your knowledge and expertise to contribute to the wider modelling activities of the Energy Security Modelling team.

Accountabilities will be split across the 4 available roles and will include:

• Lead the development and enhancement of our Pan-European market modelling capabilities to provide insight on the contribution of interconnectors to system adequacy.
• Assess the risks to security of supply during the transition to Net Zero.
• Lead the modelling of different supply and demand scenarios within GB and across Europe to assess risks to security of supply driven by uncertainty in future supply and demand patterns including those related to extreme weather.
• Support advanced modelling capability in PLEXOS.

About you

We’re forging the path, and we know we can’t do it alone. That’s why we need visionary minds like yours to join us on this transformative journey. In this case, we’re looking for someone who:

• Experience of Statistical, probabilistic or numerical modelling for the mid-level role and extensive experience of this for senior-level roles.
• Previous experience in energy market modelling would be advantageous.
• Experience in coding; statistical coding languages such as Python and R would be an advantage.
• Strong PLEXOS experience would be an advantage in one of the four roles
• Logical and creative approach to solving analytical problems, collaborating across multiple teams where appropriate.
• Excellent interpersonal skills with a proven ability to develop and maintain effective stakeholder relationships.
• Ability to communicate analytical results and concepts to a wide range of audiences (e.g., senior level, technical / non-technical)
• Excellent understanding of electricity markets

Don’t meet every single requirement? Studies have shown that women and people of colour are less likely to apply for jobs unless they meet every single qualification. At NESO, we are committed to building a diverse, inclusive, and authentic workplace for everyone. So, if you’re excited about this role but your experience or qualifications don’t match the job description exactly, we encourage you to apply anyway. You might just be the right person for our growing business in this role or another one.

What you'll get

A competitive salary between £55,000 - £70,000pa – dependent on experience and capability.

As well as your base salary, you will receive a bonus based on company performance, 26 days annual leave as standard and a competitive contributory pension scheme where we will double match your contribution to a maximum company contribution of 12%.

As we work towards creating a cleaner, greener, and more affordable future for all, we also work towards creating a place for our teammates to belong, with professional and personal growth and positive well-being.

• Full support and career-development resources to expand your skills, enhance your expertise, and maximise your potential along your career journey.
• A diverse and inclusive community of belonging, where teammates are empowered to bring ideas to the table.
• Generous Total Rewards Plan – comprising of health, finance and wealth, work/life balance, and career benefits.

More Information

This role closes on 14th July 2025 at 23:59, however we encourage candidates to submit their application as early as possible and not wait until the published closing date as this can vary.

We work towards the highest standards in everything we do, including how we support, value and develop our people. Our aim is to encourage and support employees to thrive and be the best they can be. We celebrate the difference people can bring into our organisation , and welcome and encourage applicants with diverse experiences and backgrounds, and offer flexible and tailored support, at home and in the office.

We're committed to building a workforce that represents the communities we serve, and a working environment in which each individual feels valued, respected, fairly treated, and able to reach their full potential.

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