Northern Facilities Northern's system has two distinct rate areas. Market Area is the portion of Northern's system north of Clifton, Kansas (demarcation point). Northern delivers supply to geographically dispersed markets located in the upper Midwest. Field Area is the portion of Northern's system south of Clifton, Kansas. It consists of a vast network of transmission facilities that connect to gathering systems in major production basins. Northern connects to virtually all major interstate and intrastate pipelines in the field area. Date Operational 1930 Miles of Pipe 15,141 Compression 48 Stations/633,202 hp Total 2007 Deliveries 1.197 Tcf Design Capacity 5.3 Bcf/d Market Area Pipe Size 2" to 36" Number of Receipt and Delivery Points Available for Transport 2,677 Number of Shippers 361 Maximum Operating Pressure 50 to 1,600 psig Underground Storage 73 Bcf (2 Aquifer and 1 Volumetric Depletion) LNG Storage 4 Bcf (Two Cryogenic Facilities)