Britain's national electricity grid is experiencing unprecedented fragility, according to energy consultant Kathryn Porter. She warns that a collapse, leading to widespread blackouts, is a plausible scenario exacerbated by the push towards Net Zero targets.
Porter describes a hypothetical scenario where a sharp imbalance between electricity supply and demand at 8:37 p.m. could trigger a cascading failure across the entire network. This would plunge homes and businesses into darkness, forcing essential services like airports and hospitals to rely on backup generators. Mobile phone networks would likely become congested and deteriorate, while emergency services could face significant communication disruptions. The failure of traffic lights and street lighting would increase the risk of road accidents, and blocked roads due to lack of fuel at electricity-dependent petrol stations could leave drivers stranded.
She posits that restoring the grid after a total shutdown could take days, with some areas remaining without power for significantly longer. Porter points to a recent proposal by the National Energy System Operator (Neso) to operate the grid with reduced levels of 'inertia'—the kinetic energy stored in spinning generator components—as a particularly dangerous move. This proposal, intended to save £96 million annually and aid in meeting Net Zero goals, is seen by Porter as increasing the likelihood of blackouts. She has previously voiced objections to this plan.
The grid has already shown signs of strain. Last month, it was forced to halt electricity exports to some European neighbors for several hours due to the ongoing heatwave. Conservative shadow energy secretary Claire Coutinho highlighted concerns in early July, citing whistleblower claims that Britain narrowly avoided a blackout on June 23 amid temperatures reaching 34C (93F).
Porter attributes the grid's increased vulnerability to a significant shift in the UK's power generation strategy over the past 18 years. In 2008, around 80% of electricity came from fossil fuels; now, coal-fired power stations have been entirely phased out, with the last one slated for closure on September 30, 2024. While renewables now account for 47% of domestic electricity production, gas remains crucial due to the unpredictable nature of solar and wind power. Neso reportedly missed its target of operating the network for at least 30 minutes in 2025 without any fossil fuels, underscoring the current limitations of renewable energy sources in meeting demand consistently.
Compounding these issues, UK electricity demand saw a 1% rise in 2023. The country's reliance on imported electricity, which constituted 14% in 2023 compared to 1% in 2008, has also increased. However, major electricity suppliers like France, facing issues with aging nuclear power stations, and Norway, experiencing water shortages affecting hydroelectric power, may restrict exports. Other European countries exporting to the UK also depend on wind and solar, meaning shared weather patterns can lead to simultaneous shortages.
Porter further criticizes the operational challenges faced by Neso. She notes that engineers have difficulty in accurately forecasting solar energy input due to its direct feed into the low-voltage grid. The software used to balance the grid, reportedly developed in the 1980s, is described as increasingly unreliable. A recent failure of this balancing software forced engineers to revert to manual methods using spreadsheets and phone instructions to manage power stations. Whistleblowers have also indicated that engineers are