It’s a bit more complicated. We were already planning to get out of nuclear because our plants were aging and new ones weren’t economical. Then the government decided to freeze those plans for the time being. (IIRC one reason was that they wanted to close some of our terrible coal power plants first.) Then Fukushima happened and the Greens got everyone to panic.

We could’ve gone with a measured response but a combination of the Greens believing that nuclear power is infinitely bad and plenty of old people still having vivid memories of fallout-related health warnings from Chernobyl was enough to drive most of the country into an antinuclear frenzy. It’s almost a miracle they didn’t force all of the plants to scram immediately.