Gas Quality Underperformance Update

Colorado Interstate Gas Company, L.L.C.

September 9, 2026

Gas Quality – Underperformance Update

Colorado Interstate Gas Company, L.L.C. (CIG) previously posted (see Notice #123210 and updated Notice #123220) that if the carbon dioxide (CO₂) content at a number of CIG High Plains receipt locations was not reduced to a level that is sufficient for CIG to meet the Wyoming Interstate Company, L.L.C (WIC) maximum CO₂ specification at the (FLY) Flying Hawk interconnect, CIG will begin place underperformance caps on these locations to reduce the CO₂ content of the blended gas being physically delivered to WIC to less than 2%. 

While the CIG tariff specification for CO₂ is higher than WIC's, Section 3.1 of the General Terms and Conditions (GT&C) of the Second Revised Volume No. 1 of CIG's FERC Gas Tariff (Tariff) provides, among other things, that CIG may decline to receive Gas at any Point of Receipt if the quality of the Gas is inferior to that “required by Shipper or a third Party at any Point of Delivery under the Agreement," notwithstanding Sections 3.1 through 3.3 of the GT&C of the Tariff.   

CO₂ content at the following locations has not been reduced to a level that is sufficient for CIG to meet WIC's maximum CO₂ specification.  Therefore, effective for the Intraday 1 Cycle, September 9, 2026 and the Timely Cycle, September 10, 2026, CIG will continue placing underperformance caps on the following locations to reduce the CO₂ content of the blended gas being physically delivered to WIC to less than 2%, until further notice. 

 
CO₂ content at the following locations have improved and underperformance caps at these locations will be cancelled effective for the Intraday 1 Cycle, September 9, 2026 and the Timely Cycle, September 10, 2026, CIG, but CIG will continue to monitor CO₂ at these locations and will reinstate caps if needed. 

 
CIG will continue to monitor the CO₂ content at these and other locations, including (BOW) Bowie PIN #800104, and will provide updates if there are any additions or deletions to the underperformance cap list.