The decision to turn off nuclear plants in Germany was __not__ made by the greens. It was made years ago by the CDU after Fukushima.
And can we talk about how stupid and actively malicious it is to use the Fukushima accident as a reason for shutting down nuclear plants in Germany?
Fukushima: nuclear plant in a seismically very active region in very close proximity to the ocean where tsunamis are not really a rarity
vs.
German nuclear plants: not very seismically active (if at all), no tsunamis i've ever heard of, not counting floods as those are
1. easier to foresee and manage and
2. very much less intense than a sudden wall of water razing everything in its path.
Also in Japan you kinda have to build near the coast since its surrounded by ocean on all sides while being stretched out long and not that wide with mountains as a backbone in the middle. Germany on the other hand only has the North and Baltic Sea at its northern end then progressively gets higher above sea level the more south you go, ultimately ending at the northern end of the Alps.
This decision and especially this reasoning didn't make sense then and still doesn't nowadays. It was just a kneejerk reaction to retain voter support by exploiting the fear of the uneducated and the anti-nuclear crowd.
Fukushima ended in no way like Tchernobyl did.
The Soviet power plan released radioactivity in the air, make an entire area inhabitable and killed a few dozen a people.
Fukushima did nothing of this, everything stayed inside the structure, no radioactivity went out.
As Fukushima had no recovery generators available (no fuel in them), it is a great proof that a totally out of control modern power plant is not deadly.
Less motivated reasoning gives about $300bn which would still be enough to easily replace every coal and oil plant in the country with renewables (as well as half of the gas).
Chernobyl: Core meltdown and catastrophic explosion of entire reactor. Caused by gross negligence when safety system disabled. Direct deaths: <100 Estimated indirect deaths: 4 to 16 thousand
Fukushima: Caused by 4th largest earthquake in history. No core explosion. Hydrogen explosion destroyed non structural part of building (this was by design). Core meltdown but largely contained. Contamination of air/water from venting to atmosphere. Direct deaths: 1 employee died of cancer Estimated indirect deaths: 300-2000
The reality is that nuclear reactors can lead to big events in unforeseen situations, like also Fukushima was. It's impossible to foresee what the cause for the next big event will be.