the electricity supply was dominated
by large steam turbines located near the big cities.
However, after the first oil crisis, Denmark has become a
leading country in terms of implementing CHP, energy
conservation and renewable energy. Consequently, the
Danish energy system has been changed from a situation in
1972, in which 92% out of a total of 833 PJ was oil, into a
situation of today in which only 41% out of 828 PJ is oil. In
the same period, both transportation and electricity
consumption as well as the heated space area have
increased substantially. Today, the share of electricity
production from CHP is as high as 50%, and approximately
20% of the electricity demand is supplied by wind
power [24–29]. Fig. 4 illustrates the development from 1972
until today and shows the outlook for the future in
accordance with the reference scenario explained in the
following.