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Specialists in High Voltage (HV) engineering services for renewables


Our HV services team deliver a broad range of operation & maintenance, design, installation consultancy, testing and commissioning services for renewable energy projects.  

Safety is our absolute priority. We implement and operate our own safety rules which is supplemented by our in-house 24/7/365 Control Centre, ensuring statutory compliance and the highest levels of safety.  We have also developed a robust and efficient ISO certified H&S Management System to achieve market leading safety performance. We have won awards for our approach to managing health and safety.  

Having delivered more than 23GW of renewable energy projects across the globe and supporting an operational asset portfolio exceeding 12GW worldwide for a large client base, we have experience of delivering HV services across all technologies including solar, onshore wind, offshore wind and storage, at voltages up to 500kV.  

Services include: 

  • HV operations and safety from the system
  • All types of inspections with detailed condition reporting and recommendations
  • Maintenance of switchgear, transformers and ancillaries
  • Oil sampling and analysis
  • Full Senior Authorised Person (SAP)  capability to support HV switching and isolations
  • Switchgear modifications and replacement
  • Transformer repairs and replacement
  • Protection testing and commissioning of both new and existing sites
  • Cable jointing, termination and testing services including new installations, fault finding and repairs.
  • Partial discharge testing and reporting
  • Site rectification and defect works including labelling and SLD’s to full Electricity Safety, Quality and Continuity Regulations (ESQCR) compliance 

Building on our 40 years’ experience in the renewable energy industry with direct experience of operating HV networks for both onshore and offshore assets and leveraging our large-scale Transmission & Distribution experience from the US, we have the knowledge, skills and experience to safely manage your HV project requirements.  

Contact us to find out more about how we can support you HV requirements.  

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