Not shutting down their nuclear power plants is an easy first step. Building more nuclear, developing local fossil fuel sources, and building LNG offload terminals would all be good second steps, though of course also more expensive.
More nuclear - after Fukushima not a realistic option.
LNG - would be useleff today, since the Empire decided to limit LNG exports. And even if the Germany could claim complete LNG world export capacities all for itself, it would still not be enough.
local fossil fuel sources - there are none that are not already in use
Fukushima may have been bad (this is debatable, it was bad in public opinion more than anything else), but viewed in comparison to "not having enough power leading to industry shutting down (happening now) or people freezing to death (this winter)" or "not being able to oppose Russia" perhaps it's not quite so unrealistic.
As far as I know the USA has not restricted LNG exports. LNG is still very cheap in the USA in comparison to the rest of the world because our export terminals are operating at capacity. (To be fully effective, more global LNG export capacity may need to be developed - this is very possible as the US has excess capacity, but it is of course more expensive than just importing from Russia)
There are local fossil fuel sources! Lots of coal, for instance. Yes, this option sucks, and releases a ton of pollution! But you can still do it!
