With the initial operation of their 6th. Unit Combined Heat and Power Plant at Haar, the Isar-Amper Works proved that there is room for such projects also within the framework of a regional energy supply enterprise. Therefore, the authors explain in detail the planning framework conditions and introduce the concept, the main components and the mode of operation of the unit combined heat and power plant (BHKW). The Unit Combined Heat and Power Plant Haar shows that a partnership between politics, administration and private industry can bring about good solutions.