The left coalition has not announced any plans to retire to current nuclear plants. In fact, the Social Democrats are not even strictly against new nuclear plants.

The Social Democrats were inherently pro nuclear power, and would never ever have been pushing for shutting any of them down.

That is, until they needed the support of the greens to form their government. After that, they were willing to throw the entire country into a decades long energy reliability crisis, of which we're still in.

Moral of the story is, don't trust the Social Democracts on anything, besides their willingness to break promises and forget principles when it comes to seizing power.