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    Changes in U.S. Natural Gas Transportation Infrastructure in 2004 This report looks at the level of growth that occurred within the U.S. natural gas transportation network during 2004. In addition, it includes a discussion and an analysis of recent gas pipeline development activities and an examination of additional projects proposed for completion over the next several years. Questions or comments on the contents of this article should be directed to James Tobin at james.tobin@eia.doe.gov or (202) 586-4835.Expansion of the U.S. natural gas transmission network Six new pipeline systems were placed in operation in slowed in 2004, both in terms of added transportation the deepwater Gulf of Mexico, accounting for 1,800 capacity and new pipeline mileage. Only about 1,450 miles million cubic feet per day (MMcf/d) of new of pipeline and 7.7 billion cubic feet per day (Bcf/d) of transportation capacity (Table 2). Built to support natural gas pipeline capacity were added to the national gas natural gas transportation from several large new transmission grid during 2004 compared with 2,243 miles production fields that came on line during the year, these and 10.4 Bcf/d of capacity in 2003 (Table 1). 1 The amount systems accounted for 66 percent of the total new of incremental capacity in 2004 was the least since 1999 capacity in the Southwest region and 23 percent of the when only 6.5 Bcf/d was added. U.S. total.During 2004, at least 41 natural gas pipeline projects, of The Cheyenne Plains Pipeline, a 560-MMcf/d varying sizes, were completed in 32 States and the Gulf of extension of the Colorado Interstate Gas system, was Mexico (Figure 1, Table 2). Of those, 16 were expansions on placed in operation in December 2004. Designed to existing pipeline systems or segments. The other 25 included provide natural gas transportation from the Cheyenne 16 system extensions or laterals associated with existing Hub in northeast Colorado to interconnections with the pipelines, 8 new pipeline systems, and 1 oil pipeline Northern Natural Gas Company and Natural Gas conversion. Expenditures for natural gas pipeline Pipeline Company of America systems in southwest development amounted to less than $2.2 billion in 2004, well Kansas, Cheyenne Plains is the latest in a series of below the $3.6 billion spent in 2003 and the $4.4 billion realized and proposed pipelines seeking to provide spent in 2002. 2 shippers of expanding Wyoming/Colorado production greater access to Midwestern markets. But 2004 appears to have been a temporary low in the development cycle for the natural gas pipeline grid, which A 320-MMcf/d expansion of the southern leg of the El has grown significantly over the past decade. The current Paso Natural Gas pipeline system was completed in inventory of proposed pipeline projects indicates that May 2004, which increased service to the growing capacity additions will increase again in 2005, although Arizona power market and deliveries to the North Baja fewer miles of new pipe will be installed than in 2004. Pipeline. This