The energy efficiency network (EEN) concept was first developed in Switzerland in the late 1980s and was adopted in Germany in 2002.  During a long pilot phase between 2002 and 2013, the lessons from 40 Learning EENs (LEENs) in Germany led to a certain format for regional EENs for SMEs and larger companies.  By the end of 2014, the Energy Efficiency Network Initiative (IEEN) was launched as a voluntary agreement between the German government and currently 22 industrial and economic associations, to support the creation of 500 new EENs until the end of 2020. This paper reports on two aspects of EENs of companies in Germany: