The Gas industry concept, prepared in 1985, covered the administrative area of Warsaw City Complex. The concept drawing showed the regions that, at that time, used city gas or coke oven gas and intended to change to natural gas. The gas plants, switching stations, tanks, the existing 1st degree reduction station as well as the planned 1st and 2nd degree reduction stations were marked. The existing and planned high pressure central gas pipelines and medium pressure main gas pipelines were marked as well. The concept also included the proposed regions of application of natural gas as a fuel.