Energy audit, energy management, CHP consulting, optimization of heating networks, network analysis, photovoltaics, wind power plants, biogas, industry. <br> <br>Areas: Hanover, Kassel, Hamburg, Bremen, Celle, Soltau, Nienburg, Walsrode, Oldenburg, Osnabrück, Ülzen. Minden, Herford, North Rhine-Westphalia, Magdeburg, Rostock, Stralsund, Wismar, Schwerin, Halle, Leipzig, Wolfsburg, Gifhorn, Aachen, Viersen, Salzwedel, Stendal.