Energiewende
This is all about granularity.

I renamed it as it makes more sense as an article purely about Germany's efforts in transitioning to a low-carbon economy. An article only about Germany's Energiewende only will tend to remain on-topic and will in time become a good reference for Germany's efforts in sustainability. An article about every country under the sun can quickly become long list of overviews lacking in quality and usefulness.

If I were you I'd create one Wikipedia page for each country's Energiewende/Energy transition plans and efforts. Then you could create a "metapage" – yes, call it for now "Energy transition" (in lieu of a better title though something like "Energy transition by country" or '"Energy transitions worldwide" would be better) – and on that page there can be sub-headings for each country, each with a "See also" link directly under the sub-heading which links to each of those country-specific articles on Wikipedia. Then a short summary can be provided summarising the info on each country-specific page (which, as I mentioned above re: Germany, will tend to remain on-topic and will become good references for the Energy transition efforts in each county over time, blah blah.) Such summaries are easier to keep concise and sticking to the salient points of the pages they refer to; this is of enormous benefit to the reader.

Contrast this to Wikipedia pages crammed with information on many countries. Such pages abound throughout Wikipedia. These pages tend to ramble on and on and are often the cause of so much duplication on Wikipedia. It is so much easier to write text and stick it up on Wikipedia than it is to locate, edit, and re-organise the info already on Wikipedia to make a single repository of information about it - that's the granularity I'm talking about.

So question in point, how will your page differentiate itself with pages like the Renewable energy in Germany page for example or the Energy in France page? There are also other pages out there which have overlapping information just for Germany alone such as Germany National Renewable Energy Action Plan. Are you going to add to the jumble? Stick to the principle of granularity and its easier to not do so.