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 essentialTurner 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 ResponsibilitiesLead M&E site supervision across HV substation projects throughout the UKCoordinate daily site operations, including direct labour, subcontractors, and specialist engineering teamsOversee installation, servicing, and refurbishment works on Gas Insulated Switchgear (GIS)Manage and supervise all SF6 gas-related activities, including:Gas transfer, filling, and recovery operationsLeak identification, reporting, and corrective actionsRoutine gas testing, condition monitoring, and compliance verificationEnsure all works are delivered in accordance with National Grid procedures, permits, and operational standardsMaintain strict adherence to health, safety, and environmental regulations, with particular focus on SF6 controlWork closely with client representatives, HSE teams, engineers, and commissioning personnel on siteTrack and report on site progress, productivity, and quality outputs to senior managementMaintain accurate site records, including SF6 handling data and inspection resultsAssist in outage coordination, planning activities, and multi-discipline site deliveryPromote and enforce high standards of safety, quality, and environmental performance across all site operationsRequirementsDemonstrable experience supervising UK high-voltage substation projectsStrong capability across both electrical and mechanical site supervisionPractical experience working with GIS systems and SF6 gas handlingSound understanding of F-Gas legislation and environmental compliance obligationsBackground within National Grid or comparable transmission environmentsAbility to interpret technical drawings, schematics, and engineering documentationProven leadership experience managing multiple site teams and subcontractorsStrong working knowledge of HSE regulations and HV safe systems of workRecognised site qualifications (SMSTS / SSSTS / CSCS / Safety Passport or equivalent)National Grid authorisation or eligibility to achieve authorisationWhy This Role?Join a contractor experiencing strong and sustained growth in the HV transmission sectorWork across a secured long-term pipeline of National Grid substation projectsBe involved in technically demanding GIS and SF6-focused worksOpportunity to develop within a business expanding its presence in the UK energy infrastructure marketIf you're available for your next assignment, please apply or contact Marcus Horne -JBRP1_UKTJ