Britain had to pay more than 10 times the usual price to buy electricity from Belgium as the cost soared following last week's heatwave, analysts have said.
Prices on the Nemo link, a 140-kilometre cable under the English Channel, reached a record £9,724.54 ($11,119.01) per megawatt hour at one stage on Wednesday.
A more normal price would be well below £1,000.
Analysts at energy tracker EnAppSys said the price surge was caused by constraints on the British network, possibly linked to the two-day heatwave on Monday and Tuesday.
The heatwave brought record 40ºC temperatures to the UK and led to a spike in electricity demand, as many people turned to air conditioning in a country that rarely uses it.
To add to the pressure, a storm front was moving over Belgium that limited solar power capacity, and the heatwave across Europe may have reduced the output from wind turbines, the analysts said.
“With the stress the Belgian system was under it is probably no coincidence that the cost of purchasing energy from Belgium was high,” they said.
The summer strains come amid concerns over how Europe will cope with potential gas shortages this winter if supplies from Russia completely dry up.
Britain's grid operator sent out two automated warning notices to the market last week signalling that more power needed to be generated, the Daily Telegraph reported.
The UK has interconnectors with France, Ireland, Belgium, the Netherlands and Norway which send power in both directions.
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A residential area after a large fire in Wennington, Greater London. Several fires broke out across England as the UK experienced a record-breaking heatwave. Getty Images -
Residents look at buildings destroyed by fire in Wennington. Getty -
Firefighters tackle a grass fire during the heatwave in Mow Cop, Staffordshire. Reuters -
Firefighters in Maltby, after a fire started on scrubland before spreading to outbuildings, fences and homes in South Yorkshire. PA -
The scene after a fire at Dartford Marshes. PA -
Burnt woodland is seen as smoke rises from the trees following a fire in Blidworth. Getty Images -
A car drives towards a fire in East London. Reuters -
Burnt woodland in Dartford Heath, England, after a fire on Tuesday. Getty -
Smoke columns rise from Dartford, Kent, where a fire erupted earlier in the day. AFP -
Smoke rises from Wennington neighbourhood fires in England on Tuesday. Getty -
Emergency services tackle a fire on Dartford Heath. Grass fires broke out around the country during an intense heatwave. Getty -
People look on as a fire burns in East London. Reuters -
A firefighter attends a gorse bush fire during a heatwave near Zennor, Cornwall. Reuters -
Smoke pours from a blaze in the village of Wennington, east London. PA -
Firefighters hose down a grass fire in Ravenswood in Suffolk. PA -
Firefighters rest after attending a gorse bush fire near Zennor in Cornwall. Reuters -
A large wildfire in woodland at Lickey Hills Country Park on the edge of Birmingham. AP -
Smoke from the fire near Zennor, Cornwall. Reuters -
Burnt woodland alongside a motorway near Dartford Heath. Getty -
A firefighter has a drink of water after the major blaze on Dartford Heath. Getty
The cables cover Britain's needs when its main workhorses of gas, nuclear and wind are not generating enough power. Imports and exports were broadly equal on Monday.
Britain and Belgium agreed in principle in February to build a second link.
In the north of England, thousands of households suffered power cuts as Britain buckled in last week's heat, with trains and aircraft grinding to a halt and many people choosing to stay at home.
In addition, solar panels are less efficient in extreme heat and the optimum temperature is about 25ºC, an industry group in Britain said, with records set in the spring rather than summer.
Still, it said solar power provided about a quarter of Britain's electricity at the height of last Tuesday's extreme heat.
