Looking at [1]. I would say hydro-power and nuclear is a big reason. Some also have significant wind, but it is balanced by either gas, hydro or good interconne

Looking at [1]. I would say hydro-power and nuclear is a big reason. Some also have significant wind, but it is balanced by either gas, hydro or good interconnection with neighbours (who themselves are not always as "green". [1] https://www.electricitymap.org/ https://www.electricitymap.org/