You can compare the energy mix of the countries with accessible data here https://app.electricitymaps.com/map https://app.electricitymaps.com/map Even in large

You can compare the energy mix of the countries with accessible data here https://app.electricitymaps.com/map https://app.electricitymaps.com/map Even in larger time periods (a year or so), if a country is emotting low co2 (green) then it is either nuclear plus VREs (variable renewable energies) or VRE plus hydro