OT Network Security Analyst

National Grid Electricity Transmission (NGET) is at the heart of energy in the UK. The electricity we provide gets the nation to work, powers schools and brings energy to life. Our energy network connects the nation, so it is essential that it is continually evolving, advancing, and improving. In NGET we are passionate about both operating our network safely and providing highly reliable quality of supply for our customers. At the heart of achieving these outcomes is the effective control and operation of our network.

As a Network Security Analyst, you’ll play a key role in strengthening the cybersecurity of NGET’s Operational Technology (OT) environment. Working closely with engineering, risk and security teams, you’ll support cybersecurity assessments and audits across the OT estate, contribute to risk and vulnerability assessments, and help design and implement controls that protect our operational systems from cyber threats. You’ll develop and maintain security specifications, procedures and incident response documentation, while supporting the creation of business cases for mitigation plans. You’ll also contribute to security training and awareness activities, ensuring colleagues understand evolving risks. In this role, you’ll help deploy and manage network security technologies, enforce access controls, and monitor network activity to identify and respond to potential threats. Staying up to date with emerging OT cybersecurity trends, vulnerabilities and technologies will be central to your success.

This role is based in Warwick two days a week, with hybrid working available.

What you’ll need:

• Experience with OT systems such as protection and control or other ICS environments.
• Hands‑on use of SIEM tools (e.g., Splunk), security monitoring and vulnerability management.
• Ability to analyse network traffic and respond to security incidents.
• Understanding of electrical power systems.
• Strong grasp of network security principles and technologies (firewalls, VPNs, IDS/IPS, segmentation).
• Good knowledge of networking and protocols.
• Ability to turn data into clear insights.
• Strong written and verbal communication skills.
• Analytical, critical thinker.
• Degree or equivalent experience in cybersecurity or a related field.

Desirable:

• Strong problem‑solving skills in complex security environments.
• Relevant certifications, such as: ISA/IEC 62443, GCIA, GNFA, GICSP, or Certified in Cybersecurity (CC).

What’s in it for you?

• A competitive salary of £47,400 - £60,000 per annum.
• Annual Performance Based Bonus.
• 37 hour working week.
• Flexible 26 days annual leave, plus eight statutory days.
• The option to buy additional or sell holiday days.
• Generous contributory pension scheme – we will double‑match your contribution to a maximum company contribution of 12%.
• Financial support to help cover the cost of professional membership subscriptions, course fees, books, exam fees and time off for study leave – so long as it is relevant to your role.
• Access to several flexible benefits such as a share incentive plan, salary sacrifice car and technology schemes, support via employee assistance lines and matched charity giving to name a few.
• Family care benefits including a back‑up care service for when your usual care arrangements fall through (six paid days each year as standard with the option to purchase further days).
• Access to numerous apps which support health, fitness and wellbeing.

This role closes at midnight on 8th April 2026; however, we encourage candidates to submit their application as early as possible and not wait until the published closing date as this can vary. Interviews will be held weeks commencing 13th and 20th April. In most cases, National Grid is unable to offer sponsorship for employment under the UK points‑based immigration system. As such, applicants must have the legal right to work in the UK without requiring sponsorship now or in the future under the UK points‑based immigration system. However, in exceptional circumstances where there is a clear and demonstrable need for specialist skills that cannot be sourced from the local labour market, National Grid may consider offering sponsorship. All applications are welcome from candidates who meet these requirements, regardless of race, nationality, or ethnic origin.