Platts will revise Carthage Hub natural gas index methodology

Platts, part of S&P Global Energy, will change its Carthage Hub natural gas daily index methodology to include deliveries into all interconnecting pipelines at the Carthage Hub, not just deliveries from the Carthage processing plant tailgate. Expanding the definition will align the methodology with Platts treatment of these trades and more accurately reflect the flow of gas through the Carthage Hub.

Platts will also remove deliveries into Southern Natural Gas and Texas Eastern Transmission from the Carthage Hub methodology, as they are not connected to the Carthage Hub.

The changes will take effect on trade date Jan. 30, 2026, for delivery on Feb. 1 - 2.

Current methodology definition

"Deliveries into Enable East, Gulf South Pipeline, Atmos Pipeline, Southern Natural Gas, Kinder Morgan Texas Pipelines, Tennessee Gas Pipeline, Texas Eastern Transmission and Texas Gas Transmission at the tailgate of the Carthage, Texas, processing plant in Panola County, Texas."

Revised methodology definition

"Deliveries at the Carthage Hub in Panola County, Texas. Includes deliveries into Gulf South Pipeline, Gulf Run Transmission, Houston Pipeline, Kinder Morgan Tejas, Tennessee Gas Pipeline, Atmos Pipeline, Texas Gas Transmission, Enable Gas Transmission (East), EasTrans, Enterprise Texas Intrastate System, and Mississippi River Gas Transmission. Deliveries from the Carthage plant tailgate are also included."

This decision follows a market proposal announced Dec. 18, 2025, linked here .

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