Imbalance

Tennessee ended Monday a systemwide Imbalance Warning but asked that shippers continue to match physical flow with scheduled quantities.

Pacific Gas & Electric issued a systemwide Stage 2 high-inventory OFO on its California Gas Transmission system for Friday, setting penalties of $1/Dth for exceeding a positive imbalance tolerance of 13%.

Tennessee said limited operational capacity requires it to issue an OFO Action Alert effective Saturday for all LMS-PA, LMS-MA and LMS-PL Balancing Parties in Zones 0, 1, L, 2, 3 and 4. The imbalance tolerance was set at 2% of scheduled quantities or 500 Dth/d, whichever is greater, for overdeliveries into the system and undertakes from the system, Tennessee said. See the bulletin board for further details.

After tightening the negative imbalance tolerance Tuesday from 25% to 10% in the 11th day of an Overage Alert, Florida Gas Transmission allowed the Overage Alert to expire Wednesday.

Transco said it is lifting Tuesday an Imbalance OFO that had been implemented last Friday.

Citing “current weather conditions” on its system, TGT said it is not allowing Hourly Overrun Transportation, Delivery Point Loan or Imbalance Payback from the pipeline services north of Jeffersontown Compressor Station until further notice.

Tennessee lifted Friday a Critical Day 1 OFO for Zones 1, L, 2, 3, 4, 5 and 6. Tennessee also said it had resumed allowing due-shipper imbalance payback nominations.

El Paso expanded a location-specific Strained Operation Condition (SOC) due to drafting-caused low linepack that it had declared Saturday to a systemwide SOC Sunday. The imbalance tolerance was set initially at 10%, El Paso said, but will be reduced “if conditions do not sufficiently improve.” System linepack had fallen below 7,100 MMcf “with continued takes in excess of scheduled deliveries. Additionally, the San Juan supply basin continues to experience underperformance issues related to the cold weather with an approximate shortfall of 400 MMcf at the present time [Sunday] and [El Paso] is beginning to see underperformance in the Permian supply basin as well. Performance caps have been placed and will continue to be placed on underperforming supplies.” Its Washington Ranch storage facility was on maximum withdrawal, the pipeline said. Interruptible Storage Service was suspended Sunday until further notice.

Citing high inventory levels at its Clay Basin storage facility, Questar said effective Thursday it will not accept any imbalance payback to the pipeline. “In addition, nominations and actual volumes delivered must align…so that injections into Questar Pipeline’s Clay Basin balancing account are limited,” it added. Questar also said it will be running a pig next Tuesday in the ML 68 segment between Greasewood and Fidlar compressor stations. Due to high flow rates currently coming out of the Rifle, CO area, Questar said it may need to temporarily reduce production coming into ML 68 that day to ensure a safe pig run, but it intends to keep nominations whole.