For the UK, the eclipse will hit around 8 p.m. and likely reduce generation by a bit over 1 gigawatt, with 95% of the sun obscured, Carson said in a presentation last week. Across Europe, the impacts will vary, depending on the time of the eclipse, its extent and the size of the country’s solar fleet. Overall in Europe, if the conditions are clear, solar output could decrease by about 9.7 gigawatts starting at about 7:15 p.m., according to a forecast from the Entso-e group of European power grid operators.