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Williams Pipeline Partners owns a 35-percent interest in Northwest Pipeline GP, which owns and operates a natural gas pipeline system that extends from the San Juan Basin in northwestern New Mexico and southwestern Colorado through Colorado, Utah, Wyoming, Idaho, Oregon and Washington to a point on the Canadian border near Sumas, Washington.
 Northwest’s system includes approximately 3,900 miles of mainline and lateral transmission pipeline and 41 transmission compressor stations. Its compression facilities have a combined sea level-rated capacity of approximately 473,000 horsepower. As of June 30, 2007, Northwest had long-term firm transportation contracts, including peaking service, with aggregate capacity reservations of approximately 3.4 Bcf of natural gas per day. Northwest also has approximately 12.4 Bcf of working natural gas storage capacity.
Williams (NYSE: WMB) owns the remaining 65-percent interest in Northwest Pipeline GP and Williams employees operate the pipeline system.
Northwest has access to multiple strategic natural gas supply basins, including basins in the Rocky Mountain region, the San Juan Basin and the Western Canadian Sedimentary Basin, or WCSB. Northwest provides natural gas transportation services for markets in Washington, Oregon, Idaho, Wyoming, Nevada, Utah, Colorado, New Mexico, California and Arizona, either directly or indirectly through interconnections with other pipelines.
Northwest is the only interstate natural gas pipeline that currently provides service to certain key markets, including Seattle, Washington, Portland, Oregon and Boise, Idaho.
Northwest transports and stores natural gas for a broad mix of customers, including local natural gas distribution companies (LDCs), municipal utilities, direct industrial users, electric power generators and natural gas marketers and producers.
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