CIG MAINLINE STORAGE ANNUAL ATC POSTING
AVERAGE THERMAL CONTENT OF GAS IN STORAGE
FOR 2026 / 2027 SEASON
-------------------------------------------
Pursuant to Section 1.5(a) of the General Terms and Conditions of its FERC Gas Tariff, Second Revised
Volume No. 1 (Tariff), Colorado Interstate Gas Company, L.L.C.(CIG) is obligated to monitor the
Average Thermal Content (ATC) of the natural gas inventory in its Mainline Storage fields and calculate
the actual ATC of the gas by September 30 of each year.
Based on a review of storage field gas monitoring data, CIG has determined that the ATC in its Mainline
Storage fields has not changed by more than 20 Btu's from the currently effective ATC, and consistent
with CIG's Tariff, an adjustment is not required to support system reliability. Therefore, no revision to
the currently effective ATC of 1,069 Btu per cubic foot and the related storage entitlements is necessary.
Shown below are each Shipper's current MAC, MDIQ, and MDWQ entitlements stated in the individual
contracts at 1,000 Btu per cubic foot, and at the ATC of 1,069 Btu per cubic foot. Please note that CIG currently has no Rate Schedule FS-1 shippers.
Shipper/Rate Schedule Contract MAC MDIQ MDWQ
-------------------------------- ----------- ------- -------- ----------
Atmos Energy Corporation NNT-1 31044000 435,177 4,280 12,985
@1069 465,204 4,575 13,881
Black Hills Service Company NNT-1 31053000 670 7 20
@1069 716 7 22
Black Hills Service Company. NNT-1 31043001 225,543 2,217 6,730
@1069 241,106 2,371 7,195
Black Hills Service Company NNT-1 31052006 2,936 29 88
@1069 3,138 31 94
Black Hills Service Company NNT-1 31046007 1,958 19 58
@1069 2,093 21 63
Black Hills Service Company NNT-1 215679 575,066 5,655 17,160
@1069 614,746 6,045 18,344
Black Hills Service Company NNT-1 31037000 568,680 5,592 16,969
@1069 607,920 5,978 18,140
Colorado Springs Utilities NNT-1 31051000 2,315,892 22,774 69,105
@1069 2,475,688 24,346 73,874
Colorado Natural Gas Inc. NNT-2 31038000 97,424 958 2,907
@1069 104,146 1,024 3,108
City of Fort Morgan NNT-2 31039000 164,058 1,613 4,895
@1069 175,378 1,725 5,232
Town of Keyes NNT-2 31040000 9,558 94 285
@1069 10,217 100 304
Midwest Energy, Inc. NNT-1 31047000 27,947 275 834
@1069 29,875 294 891
Public Service Co. of Colo. NNT-1 31050000 21,352,477 209,980 637,144
@1069 22,825,798 224,469 681,107
Raton Gas Transmission Co. NNT-1 31048000 210,831 2,073 6,291
@1069 225,379 2,216 6,726
City of Trinidad NNT-2 31041000 164,097 1,614 4,897
@1069 175,420 1,725 5,234
City of Walsenburg NNT-2 31042000 54,686 538 1,632
@1069 58,460 575 1,744
-------------------------------- --------------- ---------- -----------
Total @1000 26,207,000 257,718 782,000
@1069 28,015,284 275,502 835,959
For questions regarding the CIG Annual ATC posting, please contact your Account Director.
Dan Tygret
Director – Commercial
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