A well-researched and documented report by Kathryn Porter of Watt-Logic lays bare the fragility of UK electricity supply. The key points in the report are:

1. Rising Risk of Power Shortages and Electricity Rationing

Porter argues the UK’s grid faces serious supply shortfall risks before 2030. With ageing gas and nuclear plants retiring — and no clear replacements planned — she says meeting current demand without rationing will be difficult, let alone the extra demand arising from electrification of heating, transport and data centres. All but one of our nuclear power stations are due to close before 2030 which means a loss of 4.8GW of capacity. Additionally 12.0 GW of aging gas fired power stations are close to retirement and the lead time for replacement is 7-8 years.

2. Inadequate Dispatchable (Firm) Power Capacity

Renewables like wind and solar have grown fast, but Porter stresses they are inherently intermittent, totally reliant on the weather and cannot reliably cover demand, especially on cold, calm nights. She highlights a lack of investment in stable, dispatchable sources — especially natural gas — as a core risk to grid security.

3. Increasing Electricity Demand Pressures

Electric heating, EVs, moves to industry electrification, and data centres (especially AI-related loads) are projected to add large additional demand (7–10 GW) by 2030, compounding supply challenges.

4. High Probability of Electricity Rationing or Blackouts

Porter’s report estimates a 65–85% likelihood of regional electricity rationing or blackouts by 2030, and a baseline chance that one of these could cascade into a wider system failure if nothing changes.

5. Policy and Planning Critiques

Porter heavily criticises UK net-zero and grid planning assumptions as over-optimistic, saying infrastructure build-out and connection delays, rising costs, and grid constraints aren’t sufficiently addressed in official strategies. She cautions that prioritising decarbonisation targets without allowing for realistic generation assessments risks undermining UK energy security as well as affordability.

The full report is available to download here:

https://www.watt-logic.com/wp-content/uploads/2026/01/Electrification-can-the-grid-cope.pdf