Senior Operations Engineer – HV/LV Power & Substation Expert

Last Mile Infrastructure Limited; Greater London; On-site; GBP 65,000 - 90,000; Full time

Benefits offered by this job

Company sick pay

25 days holiday (increasing to 30)

EV and ULEV salary sacrifice scheme

Cycle to work scheme

Up to 7% employer pension contribution

Life assurance (x4 salary)

Private medical insurance

Job summary

Last Mile Infrastructure Limited is seeking a Senior Authorised Person (Operations Engineer) to support the construction, testing and energisation of electricity networks around London. The role involves travel to sites and occasional overnight stays, with a focus on safety and high-quality delivery.

You will supervise and mentor staff, conduct competency assessments, coordinate with DNO/IDNO engineers, and oversee pre-commissioning and energisation activities.

Qualifications

• Previous experience in the utility sector in a similar Operational Role.
• Sound knowledge of HV and LV distribution networks and the apparatus and cables used in construction.
• DNO/iDNO 11kV AP/SAP Operational Authorisation.
• A recognised supervisory Health & Safety qualification (SSSTS or IOSH).

Responsibilities

• Supervise and mentor staff to support development and enhance company performance.
• Conduct competency assessments as an Assessing Officer to ensure compliance with company authorisation standards.
• Perform pre-commissioning and testing of 11kV & LV switchgear, including IR, continuity, and pressure testing.
• Liaise with DNO engineers for final connections, energisation of substations, and IDNO/DNO LV networks.
• Plan and execute DNO LV & HV Self-Connect activities and support fault location/repair.
• Install and test CT Metering wiring in line with industry standards (COP3/COP5 & P283).

Skills

Supervision

Mentoring

Electrical testing

Project coordination

Education

HNC in electrical engineering

Tools

COP3/COP5 & P283 standards

Job description

Last Mile Infrastructure Limited is seeking a Senior Authorised Person (Operations Engineer) to support the construction, testing and energisation of electricity networks around London. The role involves travel to sites and occasional overnight stays, with a focus on safety and high-quality delivery.

You will supervise and mentor staff, conduct competency assessments, coordinate with DNO/IDNO engineers, and oversee pre-commissioning and energisation activities.