How do you define short and medium term? To me medium is a decade.
There’s also the short to medium term work of enabling nuclear plants to start up again.
“Wind and solar generation require at least 10 times as much land per unit of power produced than coal- or natural gas-fired power plants, including land disturbed to produce and transport the fossil fuels.” https://www.brookings.edu/research/renewables-land-use-and-l...
NS1 carried around 600 twh of energy per year. Current estimated wind energy production in europe is around 380 twh with 236 gw of wind capacity, so it would need to multiply this by a little over 150% to replace NS1. The EU is installing wind around 18 gw per year, or 8%. At this rate it takes around 20 years to replace NS1. However, the EU intends to increase wind installation to 30 gw per year. At that rate it takes 12 years to replace NS1.
That seems a reasonable medium term target.
(This calculation isn’t taking into account that much of that gas is used to create electricity, which loses half the energy in conversion.)