We had this the other day too- I thought it was very cheeky that they send out something that looks like a bill. Fortunately I understand German and registered quickly that it was not a regular bill- so it got filed in the waste paper bin. Not surprised if it caught a few exPats out. And I can't quite see what you would be covered for- damage due to electrical powercuts- if you did pay them- The only thing I can think of would be fridge/freezer contents, which is covered by household insurance anyway. Glad a few people have complained.