Specialist HV and LV Electrical Commissioning, Delivered Worldwide
Northern HV are a dynamic specialist electrical engineering company, focused on high quality HV and LV commissioning services. Since our launch in 2021 we have built a strong reputation for reliability, technical expertise and a hardworking, personal approach to every project.
About Us
We operate across the UK and internationally, with current major projects delivered throughout the UK and Scandinavia. Our team supports clients across renewables, utilities, infrastructure, oil and gas, construction, data centres and private networks.
From transformer builds and substation construction through to switchgear installation, commissioning and ongoing maintenance. We deliver full electrical projects from start to completion.
Services
Our services encompass a broad spectrum, including:
Electrical Design
We work across renewables, utilities, infrastructure, oil and gas, construction, data centres and private networks, supporting projects in the UK and internationally.
Installation
Northern HV provides professional HV and LV installation services for substations, transformers and switchgear.
Cabling and Jointing Services
We support clients across renewables, utilities, infrastructure, oil and gas, construction, data centres and private networks, operating across the UK and internationally.
Electrical Commissioning
We support clients across renewables, utilities, infrastructure, oil and gas, construction, data centres and private networks, delivering commissioning services across the UK and internationally.
Electrical Training
At Northern HV we provide specialist electrical training to support safe, competent working within HV and LV environments. Our training services are designed to improve knowledge, reinforce best practice and support compliance across electrical operations.
Electrical Maintenance
At Northern HV we provide HV and LV electrical maintenance services to support the ongoing reliability, safety and performance of electrical assets. Our maintenance solutions help clients minimise downtime, reduce risk and extend the operational life of their electrical systems.
Senior Authorised Person Services
At Northern HV we provide experienced Senior Authorised Person services to support the safe operation and control of high voltage electrical systems. Our SAPs ensure that all HV activities are carried out safely, in line with operational procedures and industry regulations.
A Trusted Partner for Critical Electrical Infrastructure
Northern HV works with some of the most respected names in the industry. Our clients include Hitachi, Siemens, Eaton, Hyosung, AGS, Vattenfall and SGB. These partnerships are built on trust, safety, technical excellence and our ability to react quickly to client requirements.
Every project is delivered in line with our ISO management systems, ensuring consistent quality, robust safety standards and full regulatory compliance.
We hold ISO 9001, ISO 14001, ISO 27001 and ISO 45001 certifications, are an SSIP Certification Body Member, and hold NERS accreditation. This demonstrates our commitment to quality management, environmental responsibility, information security, occupational health and safety, and the highest standards of electrical network work.
Full Project Delivery
From Design to Commissioning
At Northern HV we offer complete project delivery. Our experienced team manages every stage of the process, from early design and planning through installation, commissioning and final handover.
Our most frequent projects include transformer builds, substation builds, full switchgear installation and commissioning, HV commissioning activities and renewable service campaigns. We work closely with clients to understand site conditions, operational requirements and programme demands, ensuring every project is delivered safely, efficiently and on time.
Risk management, quality assurance and safety are embedded into everything we do and managed in accordance with our ISO management suite.
A Strong Focus on Long-Term Relationships
A Hardworking, Experienced Team You Can Rely On
Northern HV was founded in September 2021 by two engineers with a shared ambition to build a business based on integrity, commitment and hard work. Since then the company has grown rapidly, driven by a reactive approach to client needs and a strong focus on long term relationships.
Our team includes directors, operations management, project management, QHSE leadership, commissioning engineers and administrative support. All working together to deliver high standards across every project.
Our core values shape how we work every day. We are committed, disciplined and honest. We work hard, stay dynamic and remain inclusive and community orientated in everything we do.
Confidential Utility Client
UK Grid Substation
Northern HV delivered full installation and commissioning of a 400/33kV 60MVA power transformer at a UK grid substation. Vacuum oil filling, IEC 61850 protection integration, and energisation on schedule — over 8,000 man-hours without incident.
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Confidential UK DNO / ICP
UK Grid Substation
Northern HV installed and commissioned a Hitachi Energy LTA 145D1 145kV circuit breaker using eco-efficient CO₂ gas technology. Full mechanical, electrical, and gas handling works delivered within a constrained outage window.
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Confidential UK DNO / ICP
132kV Primary Substation, UK
Northern HV carried out planned maintenance on a 132kV live tank SF₆ circuit breaker at a UK primary substation. Full hydraulic system service, timing tests, and gas quality analysis — returned to service with zero gas loss.
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Confidential UK Transmission Operator
275kV Grid Substation, UK
Northern HV installed and commissioned a 275kV disconnector earth switch at a live UK transmission substation. Delivered within the planned outage window with zero lost time incidents.
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Why Choose Northern HV
Clients choose Northern HV because we offer more than technical capability. We bring a personal, responsive service backed by proven experience and recognised accreditations.
We understand the demands of live electrical environments and critical infrastructure. Our team is trusted to deliver safely, accurately and efficiently, whether supporting large scale renewable developments or complex HV installations.