The Commercial Operations Department is made up of four groups: EI Commercial, EI Commercial Technology, Rates & Regulatory and Pipeline Control.

EI Commercial is divided into three market areas that are each responsible for working with Transco's customers - LDCs, power generators, operators, producers and marketers - to meet their gas transportation and storage requirements, in accordance with Transco's FERC Gas Tariff and policies and procedures. This includes providing ongoing support related to existing firm and interruptible services, capacity release, on-line contracting, nominating and scheduling of transportation and storage transactions, allocation of all gas volumes, imbalance resolution, billing, invoicing, negotiating liquid condensate, OBA, PIBA and Mutual Assist agreements. Each geographical region is also responsible for developing new services, negotiate interconnects (shippers), work with gas producers developing reserves both onshore and offshore, third party gatherers and pipelines to connect new gas supplies to the Transco system, identifying and developing pipeline and storage expansion projects and laterals on or near Transco to meet growing capacity needs of existing and new customers, and monitoring industry developments.