Southern California Gas allowed a high-linepack OFO that was in effect Saturday to lapse Sunday. Pacific Gas & Electric (PG&E) kept its systemwide Stage 2 high-inventory OFO, which began Saturday, in effect through Sunday and Monday. Saturday’s 9% tolerance for positive daily imbalances was tightened to 5% both Sunday and Monday. PG&E is ending its OFO Tuesday.

Cheyenne Plains is limiting operationally available capacity at the Cheyenne Plains Compressor constraint point to 100 MMcf during the Timely and Evening nomination cycles for Tuesday’s gas day due to an emergency shutdown test. The limitation will primarily impact supplies from the Curley, Thunder Chief and Red Cloud points. The operationally available capacity of the Cheyenne Plains West constraint point will be limited to 300 MMcf during the outage. “Absent any issues discovered during the emergency shutdown test, Cheyenne Plains will schedule the Intraday 1 and 2 cycles…at the current 590 MMcf daily rate,” the pipeline said. Cheyenne Plains anticipates restoring the compression and treating facilities to full current service (590 MMcf/d) for the entire Wednesday gas day. A return to flow levels of about 780 MMcf/d that existed prior to a mid-September compressor station fire (see Daily GPI, Sept. 18) is still in progress; the pipeline will make an additional posting on the subject no later than Tuesday afternoon after the results of the emergency shutdown test are in.

El Paso said Sunday there was potential for a high-linepack condition on its system, with the Washington Ranch storage facility on maximum injection (limited to a single compressor due to maintenance) and linepack being above 7.8 Bcf. “Customers are strongly encouraged to monitor their transportation to ensure that takes are fully balanced with receipts,” El Paso said, adding that if the situation fails to improve, it may be required to declare a Pack Strained Operating Condition.

Noting that over the past weekend scheduled volumes through the Kemmerer (WY) Compressor Station — a system bottleneck — had been as high as 692,000 Dth/d, Northwest reminded shippers that it will attempt to offset OFOs by moving balancing gas from Jackson Prairie storage to Questar‘s Clay Basin facility until its storage balance north of Kemmerer drops below 1.2 Bcf. “Based on the current throughput demand through Kemmerer, Northwest will only be able to offset OFOs for approximately 10-14 more days,” the pipeline said. “Customers are encouraged to voluntarily reduce their nominations below 660,000 Dth/d in order to preserve Northwest’s Jackson Prairie storage balance and avoid issuance of OFOs this early in the winter heating season.”

Northern Natural Gas said Saturday it had experienced a force majeure situation at the Perryton Barlow Compressor Station. The dehydration system was not operational, requiring the station to be shut in until repairs are made. Perryton Barlow capacity was taken to zero, causing allocations at three points in the area, until further notice.

Three Spectra Energy pipelines — Texas Eastern, Algonquin and East Tennessee Natural Gas — said Monday that effective immediately until further notice, they are accepting nominations for resolution of outstanding due-pipe imbalances. “Shippers are requested to nominate such that both due-pipe and due-shipper imbalances trend toward zero,” they said.

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