In an abrupt reversal, Northern Natural Gas ended a System Overrun Limitation (indicating heavy heating load) in all market-area zones Friday and said a System Underrun Limitation would take effect in all zones Sunday “due to the large warm-up expected over the weekend.” A bulletin board posting projected that Northern’s system-weighted average temperature would go from minus 4 Friday and plus 2 Saturday to 19 Sunday and 24 Monday.

Florida Gas Transmission kept an Overage Alert Day that had begun on the previous Sunday (Jan. 3) in effect Friday but restored the original 10% tolerance for negative daily imbalances after it was tightened to 5% during the week.

Pacific Gas and Electric did not extend a systemwide low-inventory OFO beyond Friday.

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