Portfolio Manager

National Energy System Operator Limited; Warwick; Hybrid; GBP 65,000 - 72,000; Full time

Benefits offered by this job

Flexible Bank Holidays & Holiday Trade

Birthday Day Off

Cycle to Work Scheme

Retail & Gym Discounts

Private Medical Insurance

Critical Illness Insurance

Personal Accident Insurance

28 days annual leave

Pension with 12% company contribution

Job summary

National Energy System Operator Limited is seeking a Portfolio Manager to join the Enterprise Portfolio Office. The role focuses on governance, portfolio performance management and reporting across programmes and project activity.

You will embed robust governance, assure portfolio health, and drive continuous improvement in data quality and decision making across NESO's investment portfolio.

Qualifications

• Professional certification in portfolio/programme/project management or equivalent experience.
• Strong understanding of portfolio governance frameworks and assurance processes.
• Experience designing portfolio reporting and executive dashboards.

Responsibilities

• Define and continuously improve the Enterprise Portfolio Governance framework.
• Design and maintain portfolio performance management processes and controls.
• Analyse performance information to identify risks, dependencies and issues.
• Manage enterprise portfolio reporting processes and cycles.
• Lead improvement of reporting templates and standards.
• Deliver portfolio assurance including independent oversight of health, risks and deliverability.
• Lead governance for PPM tooling (Verto) alignment with standards.
• Support adoption of portfolio reporting across the organisation.
• Develop and deliver governance-led portfolio communications and executive packs.
• Provide guidance on processes, standards and best practices.

Skills

Governance expertise

Portfolio reporting

Stakeholder engagement

Analytical skills

PMO processes

Communication skills

Education

MSP/MoP/PRINCE2/APM certification

Tools

Verto

Job 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.

The Portfolio Manager role sits within the Enterprise Portfolio Office (EPO). The EPO is responsible for the effective management of NESO's enterprise-wide investment portfolio, ensuring alignment to strategic objectives and maximising the value derived from portfolio investments that support the organisation's net zero ambitions. Reporting to the Portfolio Performance Management & Reporting Lead, the role holder will design, embed and continuously improve governance frameworks, standards and methodologies to ensure robust governance, effective portfolio assurance and clear decision‑making structures across all programmes and projects. The role holder will provide subject matter expertise in portfolio performance management, reporting and governance, promoting consistent ways of working and supporting the embedding of proportionate governance, effective assurance and robust performance management practices across programmes and projects. Expertise in portfolio office management is essential for success in this role.

The role is based in Warwick, operating under NESO's hybrid working model. Attendance at either the Warwick or Wokingham office is expected one to two times per week.

Key Accountabilities

Defining, implementing and continuously improving the end-to-end Enterprise Portfolio Governance framework to ensure consistent, transparent and effective decision‑making across all programmes, projects and key BAU activity.

Designing, implementing and maintaining portfolio performance management processes, controls and governance arrangements.

Analysing performance information to identify trends, delivery risks, dependencies, constraints and emerging portfolio wide issues requiring intervention.

Managing enterprise portfolio reporting processes, reporting cycles and governance arrangements.

Lead continuous improvement of reporting approaches, measures, templates and reporting standards.

Establishing and delivering a comprehensive portfolio assurance approach, providing independent oversight, challenge and insight on portfolio health, risks, issues and deliverability to support informed decision‑making.

Leading governance requirements for Portfolio & Project Management (PPM) tooling (Verto), ensuring alignment to standards, lifecycle processes and consistent, high‑quality data across the enterprise portfolio.

Supporting adoption of portfolio reporting and performance management processes across the organisation.

Developing and delivering clear, consistent and governance‑led portfolio communications, including executive reporting, board materials and decision packs to enable transparency and alignment.

Providing expert direction and guidance on processes, standards, and best practices, fostering a culture of excellence and continuous improvement.

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.

• Passionate about Enterprise Portfolio Offices and understands the critical role governance plays in enabling strategic delivery.
• Professional certification in portfolio / programme / project management (e.g. MSP, MoP, PRINCE2, APM) or equivalent experience.
• A deep understanding of portfolio governance frameworks, lifecycle models and assurance processes.
• Experienced in designing and implementing portfolio reporting, performance management or PMO processes.
• Experienced in developing management information, performance frameworks, KPIs and executive reporting.
• Experienced establishing governance, controls and assurance processes within a Portfolio Office, PMO or Enterprise PMO environment.
• Strong analytical skills with the ability to interpret complex portfolio information and identify meaningful insights.
• Experienced in influencing and constructively challenging programme and portfolio teams and leaders.
• Demonstrates excellent communication and stakeholder engagement skills, with experience influencing and challenging at senior and executive levels.
• A deep understanding of portfolio governance frameworks, lifecycle models and assurance processes.
• Flexible, dynamic and able to pivot quickly in response to changing organisational priorities, operating environments and strategic direction.

Applicants must have the right to work in the UK by the start of employment. Visa sponsorship may not be available for this role and will be considered in line with business requirements.

What You’ll Get

A competitive salary of £65,000 - £72,000 dependent on experience and capability. As well as your base salary, you will receive a bonus of up to 15% of your salary for stretch performance, 28 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%.

• Flexible Bank Holidays & Holiday Trading
• Additional Birthday Day Off
• Cycle to Work Scheme, Retail & Gym Discounts
• Private Medical Insurance, Critical Illness Insurance & Personal Accident Insurance

About Us

At the National Energy System Operator (NESO), we play a vital role in tackling climate change and securing Great Britain's energy future. We already operate the world's fastest decarbonising electricity system and are working towards our ambition to run it carbon‑free for a short period this year - provided the market supplies electricity exclusively from renewable sources. Alongside this, we provide expert advice to government on how to deliver a clean power system by 2030. In autumn 2024, the Electricity System Operator (ESO) transitioned to become NESO - an independent, expert public corporation with a whole‑system view across electricity, gas, and hydrogen. NESO operates independently and transparently, always acting in the best interests of all energy users. Licensed and regulated by Ofgem, we make impartial decisions that balance sustainability, affordability and security. Our organisation is fully independent from government, the regulator and all commercial interests, with a clear focus on system‑wide benefit, long term thing and public value. The time to deliver is now. Join the energy transformation and help shape the future. Your energy. Our future. Together

More Information

This role closes at 23:59, on the day before date shown above, however we encourage candidates to submit their application as early as possible and not wait until the published closing date as this can vary. Research shows that some people may hesitate to apply unless they meet every single requirement. At NESO, we believe potential comes in many forms and we're committed to a fair, inclusive recruitment. 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. If this role sparks your interest but you're not sure you tick every box, we still want to hear from you. process where everyone has the opportunity to show their talents. We celebrate the difference people can bring into our organisation, and welcome and encourage applicants with diverse experiences and backgrounds. At the National Energy System Operator (NESO), we play a vital role in tackling climate change and securing Great Britain's energy future. We already operate the world's fastest decarbonising electricity system and are working towards our ambition to run it carbon‑free for a short period this year - provided the market supplies electricity exclusively from renewable sources. Alongside this, we provide expert advice to government on how to deliver a clean power system by 2030. In autumn 2024, the Electricity System Operator (ESO) transitioned to become NESO - an independent, expert public corporation with a whole‑system view across electricity, gas, and hydrogen. NESO operates independently and transparently, always actin in the best interests of all energy users. Licensed and regulated by Ofgem, we make impartial decisions that balance sustainability, affordability and security. Our organisation is fully independent from government, the regulator and all commercial interests, with a clear focus on system‑wide benefit, long term thing and public value. The time to deliver is now. Join the energy transformation and help shape the future. Your energy. Our future. Together