Onshore Natural Gas Pipelines

We own or have interests in approximately 18,746 miles of onshore natural gas pipeline systems that provide for the gathering and transmission of natural gas in Alabama, Colorado, Louisiana, Mississippi, New Mexico, Texas and Wyoming. Our onshore natural gas pipeline systems provide for the gathering and transmission of natural gas from onshore developments, such as the San Juan, Barnett Shale, Permian, Piceance, Greater Green River and Eagle Ford supply basins in the Western U.S., and from offshore developments in the Gulf of Mexico through connections with offshore pipelines. Typically, these systems receive natural gas from producers, other pipelines or shippers through system interconnects and redeliver the natural gas to processing facilities, local gas distribution companies, industrial or municipal customers or to other onshore pipelines.

Enterprise's Texas Intrastate System has the capacity to transport up to 5.5 Bcf/d of natural gas from supply basins in Texas (from both onshore and offshore sources), including the Barnett Shale region, to local gas distribution companies and electric generation and industrial and municipal consumers, as well as to connections with intrastate and interstate pipelines. This system serves important natural gas producing regions and commercial markets in Texas, including Corpus Christi, the San Antonio/Austin area, the Beaumont/Orange area and the Houston area, including the Houston Ship Channel industrial market.  The Texas Intrastate System is 7,860 miles in length and is comprised of the 6,547-mile Enterprise Texas pipeline system, the 641-mile Channel pipeline system, the 465-mile Waha gathering system and the 207-mile TPC Offshore gathering system.

In December 2008, we contributed equity interests in our subsidiaries that own the Texas Intrastate System to Duncan Energy Partners.  Duncan Energy Partners now owns a 51% voting equity interest in the entity that owns the Enterprise Texas pipeline system, as well as a 66% voting equity interest in the entity that owns the Waha gathering system and the TPC Offshore gathering system.  We own the remaining equity interest in these entities through our other subsidiaries.

In late 2008, we began design of the 40-mile Trinity River Basin Extension that will be capable of transporting up to 1.0 Bcf/d of natural gas and will provide producers in the Barnett Shale production basin with additional takeaway capacity.  The extension is expected to be completed in two phases in the fourth quarter of 2009 and the second quarter of 2010.

The partnership's San Juan Gathering System serves natural gas producers in the San Juan Basin of New Mexico and Colorado.  This system gathers natural gas from production wells in the San Juan Basin and delivers the natural gas to our natural gas processing facilities, including our Chaco facility.

The Jonah Gathering System is located in the Greater Green River Basin of southwestern Wyoming.  This system gathers natural gas from the Jonah and Pinedale fields for delivery to regional natural gas processing plants, including our Pioneer facility, and major interstate pipelines.

The Piceance Basin Gathering System consists of the 48-mile Piceance Creek and the 31-mile Great Divide gathering systems located in the Piceance Basin of northwestern Colorado.  We acquired the Piceance Creek gathering system from EnCana Oil & Gas (“EnCana”) in December 2006 and later placed it into service during January 2007. We also acquired the Great Divide gathering system from EnCana in December 2008.  The Great Divide gathering system gathers natural gas from the southern portion of the Piceance basin, including EnCana’s Mamm Creek field, to our Piceance Creek gathering system.  The Piceance Creek gathering system extends from a connection with the Great Divide gathering system to the Meeker facility.

(1) The Texas Intrastate system also includes pipelines in which Enterprise owns an undivided interest.

(2) Reflects consolidated ownership of Acadian Gas by EPO (34%) and Duncan Energy Partners (66%).

(3) Includes the Delmita, Big Thicket, Indian Springs and Canales gathering systems located in Texas and the Petal and Hattiesburg pipelines located in Mississippi.

(4) We own 100% of these assets with the exception of the Indian Springs system, in which we own an 80% undivided interest through a consolidated subsidiary. Our 100% interest in Big Thicket reflects consolidated ownership by EPO (34%) and Duncan Energy Partners (66%).