Ofgem’s Neso heatwave review: electricity security lessons for UK grid engineers
Reviewed by Tom Sullivan
First reported on New Civil Engineer
30 Second Briefing
Ofgem’s review of the 22 June heatwave finds no evidence to substantiate allegations against the National Energy System Operator (Neso), but flags unresolved risks to Great Britain’s electricity security under extreme weather. The study points to stress on transmission capacity and thermal ratings as temperatures rose, with concerns over whether existing network redundancy and interconnector support are sufficient during concurrent plant outages. For infrastructure planners, the findings signal a need to revisit summer peak assumptions, asset derating strategies and contingency margins for prolonged high-temperature events.
Technical Brief
- Nevertheless, Ofgem flags that existing security standards may not fully capture compound extreme‑heat and outage scenarios.
- For asset owners, the findings point to tighter operational temperature envelopes and more conservative summer safety margins.
- Future safety regulation updates are likely to emphasise heat‑resilience testing and documentation for critical network components.
Our Take
Recent coverage of Neso in Great Britain shows repeated tight‑margin events, including the 28 September electricity margin notice and the 1.2GW emergency import via the GB–France interconnector, which suggests systemic stress in the current security‑of‑supply regime rather than a one‑off operational issue.
The National Audit Office’s warning that transmission constraints could cost up to £7.8bn by 2030, in work costed by Ofgem, means any questions Ofgem raises about Neso’s handling of the June heatwave will feed directly into how aggressively grid reinforcements and flexibility measures are justified and sequenced.
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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