We are upgrading the New Deer 400kV substation on behalf of SSEN Transmission – increasing transmission network capacity across the Northeast of Scotland and enabling the connection of significant new renewable energy generation.
With more than 2.3GW of new capacity expected to connect by 2030, the project will support the continued growth of onshore, offshore and island wind, strengthening network resilience and preparing the network for future demand.
Balfour Beatty is designing, constructing, installing and commissioning a four-bay extension to the existing 400kV double busbar Gas Insulated Switchgear (GIS) substation.
The substation is being developed to support operation at 400kV, while initially energised at 275kV, ensuring it can accommodate future increases in network demand.
New Deer 400kV Substation
An integrated approach to delivery
The project brings together multiple workstreams within a single, coordinated delivery model, including the four-bay extension to the existing substation, incorporating substation infrastructure, switchgear installation, protection systems and associated civil works.
The works include the integration of both GIS and Air Insulated Switchgear (AIS) equipment to increase the number of available bays and enable future connections.
This approach reduces interface risk, improves efficiency and supports delivery within a live operational environment.
extension
spent with local SMEs
volunteering hours delivered
Supporting a wider transmission network upgrade
The New Deer upgrade project forms part of a wider programme of transmission investment and aligns with the development of the Beauly – Blackhillock – New Deer – Peterhead 400kV overhead line, which will strengthen connectivity across the network.
Balfour Beatty has previously supported transmission infrastructure on the New Deer substation, including overhead line works, bringing valuable experience of both substation and line-side delivery to the project.
Creating value for local communities
While delivery is at an early stage, the New Deer project is already creating meaningful social value across Aberdeenshire.
- Over £600k has been spent with SMEs so far (as of 13 April 2026) strengthening the regional supply chain.
- The project team delivered 41 hours of support to local community and employability initiatives including volunteering at the Aberdeenshire North Foodbank and supporting mock interview sessions with the Department for Work and Pensions (DWP), helping local people build confidence and access employment opportunities.
- Balfour Beatty has also joined the Peterhead Energy Transition Forum, working collaboratively with regional partners to support long-term economic growth and community wealth building.
Alongside this, the team continues to support local STEM and education initiatives, helping to inspire future talent and promote careers in construction.