Overrun

Due to below zero minimum temperatures in its Zone E/F service area, Northern Natural Gas declared a System Overrun Limitation day for Saturday in that zone.

Northern Natural Gas kept a System Overrun Limitation in place Saturday and Sunday, then lifted it Monday. NNG said early Monday afternoon that a mechanical problem caused a force majeure situation at the Chatfield (MN) Compressor Station. Based on weather forecasts, there was potential for some level of curtailment on the LaCrosse/Tomah branchline as a result, NNG said. Preliminary indications are that the force majeure could last for up to a week, it added. See the bulletin board for a list of affected points on the LaCrosse/Tomah branchline.

An on-again, off-again System Overrun Limitation notice by Northern Natural Gas was on for Saturday. The new SOL affecting all market-area zones was declared after the pipeline had one in effect Thursday but lifted it Friday.

The latest System Overrun Limitation by Northern Natural Gas proved to be a one-day affair. The SOL was lifted for Friday after being implemented Thursday. NNG, whose normal system weighted temperature at this time of year is 20 degrees F., said the system was averaging 12 degrees Thursday and that was expected to rise to 24 degrees Friday, but then to plunge to 11 and 9 degrees on Saturday and Sunday respectively.

Northern Natural Gas declared a System Overrun Limitation for all market-area zones effective Thursday.

After declaring a System Overrun Limitation for all market-area zones Friday and Saturday, Northern Natural Gas let Sunday and Monday slide with no SOL, then issued a new one affecting Zone E/F only for Tuesday. However, on Monday afternoon NNG said it had “expired” the SOL posted for Tuesday “due to increasing Zone E/F forecasted temperatures.”

Thursday’s halt by Northern Natural Gas of a System Overrun Limitation notice that had been in effect for two and a half weeks lasted only one day. The pipeline declared a new SOL for all market-area zones effective Friday.

Northern Natural Gas is lifting Thursday a System Overrun Limitation notice. The SOL had been in effect, mostly systemwide but for only one or two market-area zones on a couple of days, since Jan. 18 (see Daily GPI, Jan. 21).

Due to colder than normal temperatures and system conditions, Northern Natural Gas issued a System Overrun Limitation Sunday. It remains in effect through at least Wednesday’s gas day.