Electricity costs in the UK surged more than five-fold during a recent heatwave, as renewable energy sources proved insufficient to meet increased demand driven by cooling systems, according to an analysis of UK energy data.
The surge occurred on June 26, the hottest day of the year, when wholesale electricity prices rose from an average of £83 per megawatt-hour (MWh) to £468 per MWh. This spike occurred as households and businesses deployed air conditioning units and fans, increasing the strain on the national grid.
During the heatwave from June 22 to June 27, the UK had to rely heavily on electricity imports from Europe. At one point on June 26, imports accounted for 22 percent of Britain's electricity supply. Later that evening, as solar power generation dropped to zero with darkness, natural gas provided up to 49 percent of the nation's power.
Critics of the UK's Net Zero agenda, particularly the Labour Party's commitment to a ban on new North Sea drilling licenses, argue this situation highlights the dangers of over-reliance on foreign energy imports. They contend that domestic production, such as from the North Sea, could offer more stable and potentially cheaper power.
"The tunnel vision dogma of Ed Miliband is leaving the UK dangerously exposed to high power prices, at a time we desperately need cheap electricity to power cooling systems to enable work, school and transport to carry on as normal," said Tory shadow energy minister Greg Smith. "Labour need to pull the plug on the madness, get drilling in the North Sea and adapt to reality, not pretending they can make reality fit their narrative."
The analysis also indicated that energy prices could have risen significantly higher if available gas capacity had been lower. A reduction of just 1 gigawatt (GW) in gas capacity could have pushed prices above £750/MWh, and a 5GW drop could have led to prices reaching £1,636/MWh, approximately 20 times the average price.
Over the entire heatwave period, gas supplied 35 percent of electricity generation, wind contributed 21 percent, and solar provided 13 percent. The reliance on gas, which can be burned in power stations, peaked at 58 percent of Britain's electricity generation.
In contrast, the Labour Party has pledged to cut annual household energy bills by £300 by 2030 through its Clean Power Plan. Following their election victory, the party implemented a ban on new oil and gas drilling licenses in the North Sea.
An Energy Department spokesperson stated that global gas prices are the primary driver of high energy costs and that increased domestic oil and gas production would not reduce bills. The department emphasized the need to accelerate the transition to clean, homegrown power sources.
As Britain anticipates further warm weather, the findings suggest that storage solutions for energy will become increasingly important to manage demand for cooling systems during hotter periods.