IN Brief:
- Ofgem has approved early construction funding for Scottish electricity transmission projects under the ASTI framework.
- The funding supports early procurement of substation components, HVDC cables, land, design, surveys, and enabling works.
- The decision reflects growing pressure on transmission supply chains as Britain accelerates grid reinforcement.
Ofgem has approved early construction funding for major Scottish electricity transmission projects, giving network developers earlier access to capital for equipment procurement, land, design, surveys, and enabling works.
The decision applies to projects being progressed through the Accelerated Strategic Transmission Investment framework, known as ASTI, which was created to speed up delivery of the grid reinforcements needed to connect new renewable generation and increase transfer capacity across Great Britain.
With the latest approvals, all 26 ASTI projects now have early funding coverage. The mechanism allows developers to begin defined activities before final project assessment, particularly where long lead times, manufacturing constraints, and international demand for equipment could delay delivery if procurement is left too late.
Early construction funding can be used to secure substation components, high-voltage direct current cables, land rights, detailed design, environmental surveys, and initial construction activity. Across Scotland, those measures are tied closely to the scale of renewable generation expected to connect from onshore and offshore projects in the north of the country.
The funded schemes include Scottish Power Transmission’s Denny to Wishaw network upgrade and SSEN Transmission’s Tealing to Kincardine line, alongside a wider package of reinforcement projects across the north of Scotland. Together, they form part of the transmission build-out needed to move power from areas of renewable generation to demand centres further south, while reducing curtailment and constraint costs on the existing network.
Britain’s transmission system is entering a period of heavy capital delivery, with offshore wind, onshore wind, battery storage, interconnection, and electrified demand all pressing against network capacity at the same time. Planning approval and investment allowances remain central to project delivery, but the availability of transformers, switchgear, HVDC equipment, specialist cables, power electronics, and skilled construction teams is increasingly shaping schedules.
The early funding model gives developers a route to reserve critical equipment and progress enabling work in parallel with the final approval process. In a global market where grid operators, renewable developers, data centre operators, industrial users, and transport electrification projects are competing for the same supply base, procurement timing now carries direct delivery risk.
Network delivery is already moving towards more standardised and accelerated approaches. SSEN Transmission’s modular substation programme, using off-site assembly, wiring, and testing for customer connection projects, reflects the same pressure to shorten lead times and reduce site complexity. Ofgem’s early funding approval sits within that broader shift from sequential development towards more parallelised delivery.
Operators are also working to increase the capacity of existing assets while new infrastructure is built. National Grid’s expanded use of dynamic line rating uses real-time weather and asset data to raise circuit utilisation where conditions allow. Operational tools of that kind can ease near-term constraints, although they sit alongside, rather than replace, the need for new transmission routes, substations, and HVDC infrastructure.
The Scottish projects occupy a central position in Britain’s clean power programme because generation growth is concentrated in areas where the historical network was not designed for high-volume export. Offshore leasing rounds, onshore wind development, storage deployment, and repowering all increase the requirement for stronger north-south transfer capacity.
Early funding does not remove the practical risks attached to large grid projects. Planning consent, environmental assessment, local engagement, civil engineering capacity, outage planning, and factory production slots remain critical. It does, however, allow strategic projects to move earlier on workstreams that have long lead times and limited global capacity.
For Britain’s transmission programme, the decision reinforces a clear operational reality: generation projects only contribute at system scale when the network can carry their output. The latest approvals move Scotland’s reinforcement programme further into delivery, with procurement and enabling works now treated as critical path items in the wider electrification build-out.