![]() That compared to 30 such days in 2020, 33 in 2019 and 56 in 2018, according to analysis by Net Zero Watch, a campaign group. In October 2021 The Sunday Telegraph revealed that assumptions underpinning the committee’s 2019 advice to ministers included a projection that in 2050 there would be just seven days on which wind turbines would produce less than 10 per cent of their potential electricity output. A CCC spokesman said: “We stand by the analysis.” The recommendations were heavily relied on by ministers when Theresa May enshrined the 2050 target into law. Enshrined in lawīut, in response to further questions from this newspaper, the body admitted that its original recommendations in 2019 about the feasibility of meeting the 2050 net zero target, were also based on just one year’s worth of weather data. The CCC said that Sir Chris’s comments, in a presentation given in a personal capacity in October, following the publication of his review, related solely to a particular report it published last year on how to deliver “a reliable decarbonised power system”. ![]() He said: “Might be best to say that Chris Stark conceded that my comment that the CCC relied on modelling that only uses a single year of weather data. Last week Sir Chris, an emeritus professor and former director of energy research at Oxford University, said that the remarks to which he was referring were made by Chris Stark, the Climate Change Committee’s chief executive. In contrast, the Royal Society review examined 37 years worth of weather data. “They have conceded privately that that was a mistake,” Sir Chris said in a presentation seen by this newspaper. Sir Chris Llewellyn Smith, who led a recent Royal Society study on future energy supply, said that the Climate Change Committee only “looked at a single year” of data showing the number of windy days in a year when it made pronouncements on the extent to which the UK could rely on wind and solar farms to meet net zero. ![]() Britain’s climate watchdog has privately admitted that a number of its key net zero recommendations may have relied on insufficient data, it has been claimed. ![]()
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