"SonnenFreunde" is a German-language magazine focused on solar energy, renewable living, and community energy projects. A "Sonderheft" is a special issue; issue 156 likely centers on a topical theme within solar/cooperative energy. If a free version is circulating, readers should treat it as an accessible entry point to learn about solar technology, community energy models, and practical implementation.
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If you are looking to write a feature or presentation about Issue 156, you can use available metadata to structure it: community energy models
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