I saw "Germany" in the title and instantly assumed it was a pilot program at a local government level because I thought I'd read somewhere that in Germany, the regional governments do most of the heavy lifting in terms of legislation, with a very limited federal government, but according to the article, I was wrong:
Germany has made ODF mandatory as the standard format for documents within its sovereign digital infrastructure. The decision is incorporated into the Deutschland-Stack, the framework governing the development, procurement and management of digital systems for public administration at all levels. This is neither a pilot project nor a recommendation from a working group, but a mandate backed by the federal government and the coalition agreement.
The official document has been published by the IT-Planungsrat, the central political steering body comprising the federal government and state governments, which promotes and develops common, user-oriented IT solutions for efficient and secure digital administration in Germany: https://www.it-planungsrat.de/beschluss/b-2026-03-it.