In the period 1980-1987 Rotterdam carried out an energy saving programme for municipal buildings in the non-profit sector (hospitals, schools, offices, libraries, etc). The target of this programme was to save energy with a yearly balance between costs and benefits. In 1987 this programme resulted in aninvestment of F.42,000.000,--. The energy consumption was reduced with 16.000.000m3 gas. After 1987 the energy consumption slowly grew to the situation of 1980. In 1989 Rotterdam started with the introduction of energy management.