Data is from https://app.electricitymaps.com/map

The difference is so big because renewables are just that much more efficient than coal and, to a lesser extent, natural gas. You can have 60% coming from renewable sources and still emit 400g/kWh with a coal and gas mix, whereas all hydro is 24g/kWh according to that source. The production component is what makes renewables not completely emission-free