Nuclear power provided about 70 percent of the electricity for the COP26 meeting in Glasgow on Tuesday, according to data from National Grid’s Carbon Intensity API.

Nuclear output from the Torness and Hunterston B power plants, supported by wind power, gave the southern Scotland region, which includes Glasgow, the lowest carbon electricity in the United Kingdom. Other parts of the country, which lack nuclear and renewable capacity, had to burn coal and gas to meet most of their electricity demand.