[en] District heating by heating power stations is able to considerably reduce the fuel consumption and environmental charges by using nuclear power plants to supply energy to densely populated areas. Dealing with the problem of economically most convenient application as compared to the two other line-bound energy carriers gas and current, the following result is attained under consideration of the new energy price level: Areas of new buildings, which are not very remote for transport purposes, will be supplied with heat rather than with gas, which is more economical than the latter with the exception of very low energy requirements. For areas already supplied with gas, limit requirement values and limit heat densities for the convenient transition to district-heat supply are indicated. The room heat supply through electricity will be increasingly important in various forms, although this does not apply to densely populated areas. (orig.)