M&E Site Supervisor - HV Substations (GIS & SF6 Specialist)

Location: UK Wide (National Grid Infrastructure Sites) Contract: Long-term programme of works (initial placement with extensions expected) Day Rate: £450 CIS / Ltd (depending on experience) Requirement: National Grid Authorisation / Person Ticket essential

Turner Lovell is partnering with a rapidly expanding specialist contractor operating within the UK high-voltage transmission sector. With a strong secured pipeline of National Grid substation works, they are now seeking an experienced M&E Site Supervisor with proven capability across GIS installations and SF6 gas systems.

This position offers the chance to join a business in a clear growth phase, delivering complex substation upgrades and new build works across critical UK energy infrastructure.

The successful individual will oversee mechanical and electrical site activities within HV substations, supporting delivery through installation, maintenance, refurbishment, and commissioning stages. A solid understanding of GIS equipment and SF6 handling procedures is a key requirement for this role.

A strong balance of electrical and mechanical site supervision experience within high-voltage environments is essential, alongside a clear understanding of compliance, safety, and environmental responsibilities associated with SF6 systems.

Key Responsibilities

Lead M&E site supervision across HV substation projects throughout the UK

Coordinate daily site operations, including direct labour, subcontractors, and specialist engineering teams

Oversee installation, servicing, and refurbishment works on Gas Insulated Switchgear (GIS)

Manage and supervise all SF6 gas-related activities, including:

Gas transfer, filling, and recovery operations

Leak identification, reporting, and corrective actions

Routine gas testing, condition monitoring, and compliance verification

Ensure all works are delivered in accordance with National Grid procedures, permits, and operational standards

Maintain strict adherence to health, safety, and environmental regulations, with particular focus on SF6 control

Work closely with client representatives, HSE teams, engineers, and commissioning personnel on site

Track and report on site progress, productivity, and quality outputs to senior management

Maintain accurate site records, including SF6 handling data and inspection results

Assist in outage coordination, planning activities, and multi-discipline site delivery

Promote and enforce high standards of safety, quality, and environmental performance across all site operations

Requirements

Demonstrable experience supervising UK high-voltage substation projects

Strong capability across both electrical and mechanical site supervision

Practical experience working with GIS systems and SF6 gas handling

Sound understanding of F-Gas legislation and environmental compliance obligations

Background within National Grid or comparable transmission environments

Ability to interpret technical drawings, schematics, and engineering documentation

Proven leadership experience managing multiple site teams and subcontractors

Strong working knowledge of HSE regulations and HV safe systems of work

Recognised site qualifications (SMSTS / SSSTS / CSCS / Safety Passport or equivalent)

National Grid authorisation or eligibility to achieve authorisation

Why This Role?

Join a contractor experiencing strong and sustained growth in the HV transmission sector

Work across a secured long-term pipeline of National Grid substation projects

Be involved in technically demanding GIS and SF6-focused works

Opportunity to develop within a business expanding its presence in the UK energy infrastructure market

If you're available for your next assignment, please apply or contact Marcus Horne - Marcus.horne@turnerlovell.com