Britain power market seeks extra generation as low wind output tightens supply margin

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Britain power market supply squeeze

Highlights

National Energy System Operator issued an electricity margin notice due to a forecast shortfall of nearly 1,400MW between 6am and 11am Monday, seeking 800MW extra generation.
The supply shortfall reduced from 1,400MW to 500MW after late market response, with no risk to electricity supplies and no customer action required.
Low wind speeds across Europe contributed to reduced renewable generation and tighter supply margins in Britain, despite no grid constraints or reported plant outages.

Morning margin notice and supply response

As reported by The Guardian, the National Energy System Operator, or Neso, issues an electricity margin notice on Sunday night after forecasting a supply margin shortfall of almost 1,400 megawatts between 6am and 11am on Monday.

The notice says the grid operator needs to secure about 800 megawatts of extra generation, roughly equivalent to a medium-sized gas power plant, within eight hours before a 4am review of national power supplies.

A second notice issued after the pre-dawn review says the shortfall falls to 500MW after the late margin call. It adds that no further contingency power is required, although Neso can still ask power plants to generate more than usual between 8am and 11am, with another supply review scheduled for 7.30am.

A Neso spokesperson describes the measure as routine and precautionary, saying it gives the market an opportunity to make extra generation capacity available. The spokesperson says there is no warning of power cuts, no risk to customer electricity supplies, and no action is required from customers because Great Britain's electricity system remains secure.

Low wind conditions add pressure across Europe

Margin notices have traditionally been used on cold winter evenings, when electricity demand is usually at its annual peak, making the morning timing unusual. The latest alert follows a rise in Neso notices in recent months, including the first such notices issued during the summer as heatwaves lift demand and curb generation.

The market alert comes despite no reported grid constraints that would make power plants or wind farms unavailable, while the UK is also forecast to export electricity to Europe. That points to weak wind speeds across Europe as a likely factor behind the tighter margin, reducing renewable generation across the region at the end of last week and increasing the need for dispatchable power in Britain.

In our earlier report on the UK economy’s response to the energy price shock, we noted comments from a senior Bank of England official that the impact on activity was less severe than initially expected. The piece also highlighted how policy support helped stabilize markets, while inflation and market volatility remained key risks as energy costs stayed elevated.

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