£28bn energy grid work: RIIO-3 investment and delivery risks for project teams
Reviewed by Tom Sullivan
First reported on The Construction Index
30 Second Briefing
Energy network companies have been cleared by Ofgem to invest £28bn between April 2026 and March 2031 under the RIIO-3 price control, with £17.8bn for maintaining Britain’s gas networks and £10.3bn for strengthening the electricity transmission system across 80 projects. The package includes staged release of funds and clawback mechanisms, with Ofgem imposing an explicit “efficiency challenge” and on-time, on-budget delivery requirements on monopoly operators. Ofgem estimates the net impact on consumer bills at about £30 a year by 2031, framing this as the cost of grid resilience and capacity for new industrial loads.
Technical Brief
- Framework explicitly ties allowed revenues to incentives, innovation outputs and defined performance measures for monopoly operators.
- Ofgem has classed Britain’s gas and electricity networks as “among the safest, most secure and resilient”.
- Funding release is conditional, with staged drawdown and contractual clawback if allocated capex is not deployed.
- On-time, on-budget delivery is a formal regulatory obligation, not just a commercial target.
- 80 electricity transmission schemes plus associated enabling works will be delivered under this determination.
- New network capacity is targeted at connecting “new industrial customers” and non-gas energy sources to the grid.
- Regulatory emphasis on “every pound must deliver value” signals tighter scrutiny of cost estimates and risk allowances.
Our Take
The related RIIO-3 determination piece in our database references up to £90bn of regulated spend, so this £28bn grid work appears to be only a defined subset of the wider transmission and distribution envelope that Ofgem is signalling for Britain.
With £17.8bn earmarked for gas networks versus £10.3bn for electricity transmission, the RIIO-3 framework suggests a managed, rather than abrupt, transition away from gas infrastructure in the United Kingdom, which will matter for contractors balancing gas asset life-extension against new-build electrical works.
An 80-project transmission programme spread over the next five years in Britain will likely create a sustained pipeline of civils, foundations and grid-connection work, which in our Infrastructure coverage tends to favour multi-year framework agreements over single-project tenders for major contractors.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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