>What does the German Green Party say in their own political platform today about the use of thermal power plants?

Doesn't matter, at least in Germany. Maybe it's different in other countries, though this would surprise me. Here, nobody reads the party platforms, as they do not correlate with the actions of our political parties.

If you vote according to party platform, then you should probably vote for the conservatives or the reds, as they pretend to be good for the economy and the workers.

I think it's better to judge a party by their actions, instead.

If you judge the political views of a party on how they vote (i.e. their actions), then the result will be a mess. Political parties vote in blocks and alliances, with negotiations and give-and-take. They regularly vote against their own interests if their negotiations means getting their own politics through. One has to look at what they say, not what they do, in order to understand why they voted one way or an other.

There have been recently in Sweden a discussion around party voting and block voting. In concept, every politician could vote independently based on their own views and opinions, but as a practical matter they vote according to party politics. Some has now voiced that this should be mandated according to election result, while others want to keep the current system where elected has a choice to ignore party politics and be independent after the election. The reason this has become an issue is that recent elections has been very close with only a few seats difference between the blocks, thus independent (called "wilds") representatives has the ability to overturn votes when the blocks artificial maintains the relative balances between each other.

Last, if we look at the actions, then guess how the green party voted when it came to construction of new thermal power plants in south of Sweden.