UK, Scotland: SSEN Transmission is expanding the use of modular substations across its network as part of efforts to modernise grid infrastructure and accelerate renewable energy connections.
Designed for 132 kV and 33 kV applications, the modular substations are intended primarily for smaller-scale customer connection projects, including wind farms and other renewable generation facilities. Energisation of the first projects is expected to begin from autumn 2028.
According to SSEN Transmission, the new approach allows much of the assembly, wiring and testing work to be completed off site in factory-controlled environments before installation and commissioning. The company said this reduces construction time, site disruption and environmental impact while supporting safety and reliability requirements.
To support the programme, SSEN Transmission awarded framework agreements to Hitachi Energy and GE Vernova following a year-long tender process.
Rob McDonald, Managing Director of SSEN Transmission, said: “Modular substations represent a revolutionary change in how we deliver customer connections, and SSEN Transmission is at the forefront of rolling this technology out across our network. By doing more of the work off‑site, we can improve safety, shorten construction times and significantly reduce the environmental impact of construction, including smaller site footprints and less disruption for local communities.”
Hitachi Energy highlighted the resilience benefits of its containerised EconiQ® gas-insulated switchgear technology, while GE Vernova said the modular substations combined with its SF₆-free g³ technology are designed to support “faster, lower-impact renewable grid connections”.
The programme forms part of SSEN Transmission’s broader strategy to modernise grid infrastructure and support the integration of clean energy generation across Scotland.
Source: SSEN Transmission
