Scotland is producing more clean, green energy than ever before, and we need to strengthen the transmission network so we can get it to the homes, schools and businesses that need it.
To help make this happen we need to build an extension to the existing Smeaton Substation near Whitecraig and Cousland in both Midlothian Council and East Lothian Council boundary areas.
The extension to the substation will help to increase network capacity and accommodate new connections to the network, helping to guarantee secure electricity supplies in future.
Background: the energy challenge
The UK is committed to achieving Net Zero emissions of greenhouse gases by 2050, with a target of 40GW of electricity to come from offshore wind by 2030 - enough to power every home in the UK.
Scotland has taken a further step, setting a target date for Net Zero emissions by 2045 – meaning that Scotland’s contribution to climate change will end, definitively, in one generation.
At the same time, the UK Government forecasts that the use of green electricity will double by 2050, with the amount generated from UK offshore wind predicted to increase to 100GW from a projected 40GW in 2030.
We are in the middle of a transformation, with the electricity we use moving away from centralised generation towards multiple smaller-scale renewable sources, both on and offshore, which are geographically distributed.
This huge change means we need to upgrade the UK’s electricity transmission infrastructure, to accommodate the increasing amount of power flowing through the network from where it is produced to the homes, businesses, hospitals and public services that need it.
The Proposal
The Proposal
SP Energy Networks is proposing to build an extension to existing Smeaton Substation, approximately 500m south west of Whitecraig, in East Lothian and 700m north east of Dalkeith, in Midlothian. The site lies predominately within the administrative area of East Lothian Council.
The Proposed Development includes an extension to the existing substation compound and the installation of a new 400kV metering bay, associated switchgear, protection and control equipment, and a new modular control building. To accommodate the extension works, the existing 132kV P Route cable within the substation will be diverted. Civil engineering works will include earthworks, foundations, access roads, fencing, drainage systems, cable trenches and associated infrastructure required to support the new facilities.
Project Documents
Have your say
Have your say
We are consulting the public on our proposals between 21st September and 19th October 2026.
You can view physical consultation materials and share feedback at the following events:
| Date | Location |
| Wednesday 30th September, 4pm to 7:30pm | Cousland Village Hall, Quarrybank, Cousland, Dalkeith, EH22 2NT |
| Thursday 1st October, 10am to 3pm | Whitecraig Centre Village Hub, 72 Whitecraig Avenue, Musselburgh, EH21 8PB |
You can also share your views by email at smeatonproject@spenergynetworks.co.uk or write to:
Smeaton Project Manager
Land and Planning Team
SP Energy Networks
55 Fullarton Drive
Glasgow, G32 8FA
Interested parties will have the opportunity to learn more about the proposed substation development, meet the project team, and ask questions. The materials that will be shown at the events will also be available on our website from 18th September along with an online feedback form.
Feedback can also be provided via our online feedback form.