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Ofgem is expected to seek answers to a number of remaining questions about the shutdowns, which National Grid acknowledges represented the worst disruption to Britain’s power grid since 1987.

The Times understands that National Grid contacted E.ON about midday on Tuesday, soon after technical glitches led to the unplanned loss of two of Britain’s biggest power stations, Sizewell B in Suffolk and Longannet in Fife, resulting in a 1,510-megawatt shortfall in supply.

It requested that the E.ON plant at the Isle of Grain be readied to help to plug the gap. The plant was ready for use in a little over half an hour and could have delivered 650MW of power to the grid immediately.

Traders said that E.ON sought prices of 950 per megawatt hour from National Grid for power from the Isle of Grain plant while other suppliers were offering prices at less than half this level. However, prices from rival suppliers also quickly shot up and National Grid finally opted to buy power from RWE npower’s plants at Fawley in Hampshire and Littlebrook in Kent for about 850 per megawatt hour.

The prices were still far above the usual market price of about 40 to 60 per megawatt hour. One source pointed out that prices even higher than this were not unheard of in the UK power market. National Grid is understood to have bought power at prices of as high as 1,500 per megawatt hour from the Grain plant in the past at moments of peak demand.