Scottish and Southern Electricity Networks (SSEN) has completed an £8 million upgrade to its electricity infrastructure in the North Baddesley area of Southampton, the network operator announced on 5 November 2025. The project took just over 16 months and was delivered with the Freedom Group of Companies Ltd as design and build contractor1.
SSEN said the work has opened up an additional 47.8 MVA (megavolt-amperes) of capacity, which it describes as supporting new electricity connections and enabling more people and businesses to take up low-carbon technologies such as electric vehicles, solar panels and heat pumps1. The programme included the design and build of a new substation with two transformers, and nearly 7 kilometres of cable previously carried on the overhead network between North Baddesley and Rownham has been put underground1.
The company said the modernisation makes local power supplies more resilient and flexible, reducing the risk of power cuts by future-proofing supplies against more severe and unpredictable weather conditions1. The North Baddesley scheme sits within a wider £155 million SSEN investment programme to transform Southampton's electricity infrastructure, which the company also refers to in the announcement1.
"In addition to contributing to the low-carbon goals for the wider area of Southampton, our decision to reroute a significant stretch of overhead lines underground has improved the landscape and visual amenity for the local community."
Why it matters for households
Capacity on a local distribution network sets how much new electrical load a home can add without triggering reinforcement work. The 47.8 MVA added at North Baddesley is headroom for new connections and for technologies that shift a household's energy use onto electricity, such as heat pumps and EV charging1. SSEN states the extra capacity is available to homes and businesses locally1.
Undergrounding the cable between North Baddesley and Rownham removes a stretch of overhead line from the landscape, which SSEN links to visual amenity for the community1. Overhead lines are also exposed to wind, falling trees and ice; SSEN presents the wider modernisation as reducing the risk of power cuts from severe weather1. For a household, fewer interruptions mean fewer unplanned outages and less reliance on backup arrangements during storms. The SSEN distribution network page covers how the operator handles supply and priority services, and the national supply hub sets local reinforcement in the context of GB security of supply. Firm capacity is also procured centrally through the Capacity Market, which is separate from this local distribution work.
What happens next
SSEN has not reported a completion date or scope for the remaining phases of its £155 million Southampton investment in this announcement1. No further milestones for the North Baddesley area have been reported1.