Recently UK Gov has been using the term “security of supply” frequently, often without a clear distinction between what genuinely contributes to it and what can actively undermine it.

UK Gov claims that a new, interconnected offshore wind fleet will strengthen UK security of supply by reducing exposure to fossil fuels. While this may reduce fuel price volatility, it does not in itself improve security of supply, the ability to meet demand reliably under all conditions.

First, Europe wide wind droughts are well documented. Large, slow moving high pressure systems can suppress wind generation across the UK, the North Sea, and much of continental Europe simultaneously, often for days or weeks and frequently during winter peak demand. In these conditions, geographically distributed offshore wind offers limited diversification benefit. Interconnecting wind farms does not change the underlying weather dependency.

Second, hybrid wind linked interconnectors are intrinsically less firm than technology agnostic interconnectors. A conventional interconnector can carry electricity from whatever generating source is available - nuclear, hydro, gas, storage, or renewables etc. A wind integrated link increases available capacity when wind is present but loses that capacity when it is not.

Third, claims that such projects “escape the fossil fuel rollercoaster” conflate price stability with physical security. Wind reduces fuel consumption and average prices over time, but during low wind periods the system remains dependent on firm despatchable generation, including gas. Interconnection does not remove that dependence when weather driven shortfalls affect all connected systems simultaneously, as seen in 2021 when renewable output fell by around a third in the UK and across mainland Europe.

Existing interconnectors to France and Norway have already shown limits, affected by domestic supply pressures, reduced French nuclear availability, and geopolitical considerations. These risks are not an argument for greater reliance on wind; they are a warning that the UK needs more domestic firm generating capacity. At present, we are losing more capacity than we are adding.

In summary, offshore wind interconnection can improve economic efficiency and fuel diversification, but it should not be presented as a major improvement to security of supply. True security depends on adequate firm, dispatchable generation — gas, nuclear, and storage (including hydro). Overstating the security benefits risks obscuring the continuing need for firm capacity in future system planning.
Are we, as an island nation, becoming too reliant on other countries and intermittent technologies for our energy needs?
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