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High- & Extra-High-Voltage Networks
End-to-end delivery of high-voltage and extra-high-voltage networks, built for demand that never switches off.
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Electricity is something we rarely think about until it is no longer there.
Yet behind every home, business, hospital, transport network and industrial site lies an infrastructure under growing pressure. Demand is rising, assets are aging and the grid is being reshaped by electrification and new connections. High-voltage and extra-high-voltage networks are carrying more load, more complexity and more responsibility than ever before.
Circet Energy helps operators respond to that pressure by reinforcing the backbone of the grid where it matters most. From route design and network studies to overhead lines, underground cables, substations and rapid storm response, our teams work across the full lifecycle of critical power infrastructure, to keep power moving safely and reliably.
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From route design to long-term resilience
Supporting network operators and infrastructure owners
Transmission operators
Transmission operators need high-voltage infrastructure that can reinforce capacity, extend asset life and maintain system resilience across critical networks.
Distribution network operators
Distribution operators need safe, compliant and future-ready overhead, underground and substation works that support growing demand and network modernization.
Infrastructure & asset owners
Infrastructure owners integrating renewable generation into complex estates need delivery teams able to work safely within constrained operational environments.
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Circet delivered a large‑scale refurbishment of a 275 kV transmission line between Coolkeeragh and Magherafelt in Northern Ireland. Spanning 56 km, the project focused on upgrading critical infrastructure while maintaining network continuity on one live circuit, an essential constraint that shaped every phase of delivery.
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FAQs
Circet Energy delivers end-to-end services for high voltage and extra high voltage network projects, including route studies, detailed design, overhead lines, underground cables, substations, commissioning, maintenance and emergency response. Our teams support the full lifecycle of critical power infrastructure.
Circet Energy supports overhead line and underground cable upgrades across the full project lifecycle, from route feasibility studies and detailed design to construction, commissioning and long-term maintenance. This includes circuit rebuilds, conductor replacement, tower strengthening, cable diversions, jointing and fault repair, helping operators modernize aging infrastructure and extend asset life.
Our teams operate in live network environments through strict health, safety, environment and quality (HSEQ) frameworks, live-line working capability, principal contractor expertise and rapid storm response services designed to minimize disruption and restore service quickly.
Circet Energy supports HV and EHV network projects across Europe through its operational footprint, engineering capabilities and field teams specialized in transmission and distribution infrastructure. Our teams work alongside transmission operators, distribution network operators and utilities in live environments where safety, compliance and continuity of service are essential.
Working on high voltage and extra high voltage networks means operating in environments where safety, precision and technical expertise are essential. Circet Energy offers career opportunities across design engineering, overhead line works, cable jointing, substations, project management and emergency response. Our teams benefit from continuous training, strong HSEQ standards and hands-on development in live critical network environments, helping them build long-term expertise while working safely at every stage. Job openings are available on Circet’s country websites, accessible from the homepage and the Careers page.
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