Contact about us electricity gas Energy management Competitive advantage construction sites Career News service Energy management WOLFF & MÜLLER ENERGY GMBH is a nationwide cooperation partner of TÜV Rheinland Energie und Umwelt GmbH I want to save! WOLFF & MÜLLER ENERGY was able to reduce the energy costs of its customers by up to 15%. You too can benefit from our know-how! 5 new products Cost optimization for electricity - protected by patent! This is how much our customers are currently saving: Health care [electricity]: 12% Plastics [electricity]: 10% Metal industry [electricity]: 8% imprint