Senate of Berlin was deciding against public funding for Christmas illlumination of Kurfürstendamm (article). If no private sponsors can be found the famous Christmas lights of Berlin's shopping boulevard will not or less shine this year.
In each German city there are different individual handlings on the energy price situation around Chistmas time (article in German language).
Recommendation for travellers looking for Christmas lights and markets is to check the situation at your planned destinations.