IN Brief:
- AMPACIMON has been selected for a National Grid dynamic line rating deployment across part of the UK transmission network.
- The programme covers 585km of high-voltage lines, with DRONE VOLT expected to install sensors on live conductors using LineDrone technology.
- Dynamic line rating is moving further into mainstream network operation as transmission operators seek more capacity from existing overhead circuits.
AMPACIMON has been selected by National Grid as one of three operators to equip part of the UK transmission network with dynamic line rating sensors.
The deployment covers 585km of high-voltage overhead lines and will provide real-time visibility of transmission capacity across selected circuits. AMPACIMON’s role will be supported by DRONE VOLT, which is expected to install the sensors on live conductors using its LineDrone system.
Dynamic line rating, commonly shortened to DLR, uses live measurements to determine how much current an overhead line can safely carry under actual operating conditions. Conventional static ratings rely on conservative assumptions around conductor temperature, weather, and thermal limits, while DLR draws on real-time variables such as wind, ambient temperature, solar heating, and conductor behaviour.
Installation on live high-voltage infrastructure adds a further technical layer to the project. DRONE VOLT’s LineDrone is designed for work on overhead lines and can install sensors without taking the circuit out of service. The system has been developed for very high-voltage power lines from 315kV to 735kV, allowing sensor deployment to be carried out with limited disruption to network operation.
The final number of sensors has not yet been confirmed. Once the sensor count is defined, DRONE VOLT’s installation programme will determine the number of missions required and the full operational scope of the work.
Across the UK transmission system, network operators are trying to release more usable capacity while major reinforcement schemes move through planning, procurement, and construction. New overhead lines, substations, converter stations, and cable systems remain central to long-term grid expansion, but long lead times for power equipment are pushing operators to extract more value from existing assets.
That same pressure is visible across recent UK transmission activity. Ofgem’s early construction funding for Scottish grid projects highlighted the need to secure long-lead components before global competition tightens further, while SSEN Transmission’s modular substation programme points to a more repeatable approach to grid delivery.
DLR fits into that wider move toward faster, more flexible network operation. Instead of adding a new circuit, the technology gives operators more accurate information on what an existing circuit can safely carry at a given moment. That can support higher utilisation, reduce curtailment, and give control rooms a stronger evidence base during periods of high renewable output or changing demand.
Weather-driven generation makes that operational visibility more valuable. Wind generation often coincides with cooling conditions that allow overhead lines to carry higher currents safely, but static ratings do not always reflect that additional headroom. By bringing weather, thermal behaviour, and line loading into a live operating model, DLR can help operators align network capacity more closely with real system conditions.
The technology does not replace the need for new transmission infrastructure. Great Britain still requires new circuits, substations, HVDC links, and wider system reinforcement to move renewable power from generation zones to demand centres. DLR instead adds an operational layer to a system that is becoming more congested, more variable, and more dependent on real-time decision-making.
As electrification increases demand and renewable generation continues to concentrate in specific regions, transmission capacity will increasingly depend on both physical build and smarter operation. National Grid’s use of dynamic line rating sensors shows grid-enhancing technologies moving from isolated deployments into wider network planning.