At least battery storage seems to be unrealistic solution. The needed amount of energy storage for several months is enormous and in addition to that problem, batteries tend to self-discharge.

Geothermal energy and hydro storage are not without problems either. I am not sure about ammonia storage, but it would be interesting to see some calculations about the feasibility of storing so much energy by using hydro or ammonia.

Thanks to the local green party we are behind schedule in nuclear energy. They have dragged the process by years and also in practice forced us to have a new reactor type. In reality much better solution would have been at least two smaller and more traditional reactors (which would provide also more redundancy) than more experimental reactor which is also uncomfortably large. However the older nuclear reactors we have, have worked pretty well and are still producing energy cheaply and reliably unlike renewal energy.