The primary reason is: Winter is coming...
But there is more:
- They wanted to be super green so lets go with sun and wind
- But, hey sun and wind are not reliable (not talking about some problems that the grid is not very good prepared to handle the peaks), especially not in winter
- Let's use gas to cover that, Russia is so friendly country, and its all about business, what kind of maniac would stop natural gas, when we pay billions for it
- Hmm, well there is 'a country' that is using natural gas to do politics, but hey, they got Crimea now, what would they want more, when we are still paying that billions to them. Let's build another gas pipe, and pretend nothing can go wrong, while ignoring that negativistic east-european countries preparing for worst case scenario
- And, what about shutting down that completely functional nuclear power plants ? We want to be green, lets do that.
- Oops, our lovely natural gas supplier attacked another country
- Oops, our natural gas power plants are somehow costly to run now, lets burn some coal
- Oops, coal is also getting a bit expensive
- Oops, our not very friendly natural gas supplier, occasionally stops natural gas now
- Ooops, our natural gas reservoirs will be not full before winter
- Oooops, winter is coming...