Onshore Natural Gas Pipelines

We own or have interests in approximately 17,758 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 and Greater Green River 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.

Revenue is generated primarily based on a fee per unit of volume (typically in MMBtus) gathered or transported. Natural gas pipelines (such as our Acadian Gas and Alabama Intrastate systems) may also gather and purchase natural gas from producers and suppliers and resell such natural gas to customers such as electric utility companies, local natural gas distribution companies and industrial customers.

Enterprise's 6,976-mile Texas Intrastate System gathers and transports natural gas from supply basins in Texas (from both onshore and offshore sources) 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, the Houston area. And the Houston Ship Channel industrial market. The Texas Intrastate System is comprised the 6,106-mile Enterprise Texas pipeline system, the 229-mile TPC Offshore gathering system and the 641-mile Channel pipeline system.

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 over 10,630 producing 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 Our ownership in this gathering system is through our 19.4% equity method investment in Jonah Gas Gathering Company, which we acquired from TEPPCO in August 2006. We completed the first portion of the Phase V expansion the Jonah Gathering System in July 2007. Currently the gross gathering capacity of this system is 2.0 Bcf/d (net to our interest, 387 MMcf/d) and is expected to increase to 2.4 Bcf/d upon the completion of the final stage of this expansion in April 2008. For additional information regarding this joint venture arrangement with TEPPCO, see Item 13 of this annual report.

The Piceance Creek Gathering System consists of a recently constructed natural gas gathering pipeline located in the Piceance Basin of northwestern Colorado. We acquired this pipeline from EnCana Oil & Gas ("EnCana") in December 2006. The Piceance Creek Gathering System extends from a connection with EnCana's Great Divide Gathering System located near Parachute, Colorado, northward through the heart of the Piceance Basin to our 1.5 Bcf/d Meeker natural gas treating and processing complex, which completed its first phase of construction in October 2007. We placed the Piceance Creek Gathering System into service in January 2007 and it currently transports approximately 520 MMcf/d of natural gas. With connectivity to EnCana's Great Divide Gathering System, our Piceance Creek Gathering System has access to natural gas production from the southern portion of the Piceance basin, including production from EnCana's Mamm Creek field.

Onshore Natural Gas Pipelines

Facility	Ownership Interest	Miles	Operator	Function
Texas Intrastate System	100%⁽¹⁾	6,976	Enterprise	Intrastate pipeline system that gathers and transports natural gas from supply basins in Texas and offshore in the Gulf of Mexico for delivery to local gas distribution companies and electric generation and industrial customers.
San Juan Gathering System	100%	6,065	Enterprise	Extensive natural gas gathering system serving producers in the San Juan Basin of New Mexico. It delivers production to the Chaco and San Juan natural gas processing facilities, with natural gas ultimately delivered into El Paso Natural Gas Pipeline. It delivers NGL to MAPCO and Wingate.
Jonah Gas Gathering System	TPP - 80.6% EPD - 19.4%	643	Enterprise	Gathers natural gas from the Jonah and Pinedale fields in Wyoming for delivery to regional natural gas processing plants, including our Pioneer facility, and major interstate pipelines.
Encinal Gathering System	100%	449	Enterprise	Gathers natural gas from the Olmos and Wilcox formations and delivers into our Texas Intrastate System, which delivers the natural gas into our south Texas facilities for processing.
Petal Pipeline	100%	70	Enterprise	Capable of delivering in excess of 1.4 Bcf/d of natural gas into five interstate pipeline systems.
Piceance Creek Gathering System	100%	48	Enterprise	Gathers natural gas from wells in the Piceance Basin.
Canales Gathering System	100%	32	Enterprise	Gathers natural gas from wells in South Texas.

Acadian Gas System

Facility	Ownership Interest	Miles	Operator	Function
Cypress Pipeline	DEP - 66% EPD - 34%	577	Enterprise	Transports natural gas from onshore developments and, through connections with offshore pipelines, Gulf of Mexico production to local gas distribution companies, electric generation and industrial customers, including those in the Baton Rouge-New Orleans-Mississippi River corridor.
Acadian Pipeline	DEP - 66% EPD - 34%	438	Enterprise
Evangeline Pipeline	49.5%	27	Enterprise

Facility	Ownership Interest	Miles	Operator	Function
Alabama Intrastate System	100%	408	Enterprise	Gathers natural gas from the coal bed methane producing regions of Alabama.
Delmita Gathering System⁽²⁾	100%	248	Enterprise	South Texas natural gas gathering system that connects approximately 140 producing wells to the Delmita processing facility.
Big Thicket Gathering System	100%	272	Enterprise	Gathers natural gas production from East Texas fields for delivery into the Indian Springs natural gas processing facility.
Indian Springs Gathering System	80%	89	Enterprise	A system of three pipelines located in East Texas that gather area production into the Indian Springs processing facility.

⁽¹⁾The Texas Intrastate system also includes pipelines in which Enterprise owns an undivided interest.
⁽²⁾These gathering systems are an integral part of our natural gas processing business, the results of operations and assets of which are accounted for under our NGL Pipelines & Services business segment.