NIE Networks has begun using drones to fit new real-time sensors on Northern Ireland’s electricity transmission network, the first time such devices have been installed on live power lines anywhere in the UK.

With rising numbers of renewable generators seeking connections, sections of the grid are becoming constrained. Traditionally, adding capacity means costly, disruptive rebuilds of overhead lines that take considerable time.

Under the initiative, Dynamic Line Rating (DLR) technology is being rolled out in partnership with Heimdall Power. Compact sensors mounted on overhead conductors monitor temperature, wind and sunlight, providing live data on how much electricity each line can safely carry at any moment.

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Using real operating conditions instead of fixed assumptions could unlock up to 30% additional capacity on existing circuits without the need for physical upgrades.

Caron Malone, Network Development Manager at NIE Networks, said: "Dynamic Line Rating and live line drone installation represent a major step forward in how we manage and future proof Northern Ireland’s electricity network. By combining real time data with innovative installation techniques, we can unlock significant capacity on existing lines. Using drones makes installation faster, cheaper and safer. Now, we have demonstrated we could do this while lines stay energised, so there is no impact on customers, fewer staff are required on site which means we can roll these sensors out at pace.

"This technology makes our network safer, smarter and more sustainable, while supporting SONI and the wider renewables industry to bring more clean, locally generated energy onto the system. We’re proud to be leading the way in the UK with this approach and demonstrating what innovation can achieve for customers and for the energy transition."

The project is being delivered with SONI, the Transmission System Operator, to reduce renewable constraint and maximise the use of clean, locally generated energy. Together, drones and DLR are enabling a safer, smarter and more sustainable electricity network for Northern Ireland.