[belorn]

Impose a law that forbids the constructions of new fossil fuel power plants, and any existing plants must be decommissioned when their current planned operational life-time has expired.

Either the market will start to invest in non-fossil fueled alternatives when demand exceed supply, or people will elect governments that step in and invest in non-fossil fueled alternatives. Either way, the coal, oil and gas plant can not continue to be part of the European energy grid.