Imbalance

NOVA returned its imbalance tolerance range to the normal -4/+4 after having tightened it to -2/+4 Wednesday.

Until further notice, Columbia Gulf said Thursday it will not be accepting imbalance paybacks or allowing shippers to create new length on their contracts.

Tennessee lifted Monday a systemwide Imbalance Warning that had been implemented two days earlier.

Tennessee lifted Friday an Imbalance Warning for Zones 5 and 6, but asked customers to stay in balance.

The Maryland House of Delegates has approved a bill that would freeze the permitting of Marcellus Shale drilling until 2013 while state agencies review the results of various studies into Marcellus development and hydraulic fracturing (hydrofracking), including a major study being performed by the U.S. Environmental Protection Agency (see Shale Daily, Feb. 24).

Saying it had limited operational flexibility to manage imbalances, Tennessee issued a systemwide Imbalance Warning effective Saturday that barred the creation of positive daily imbalances.

Tennessee said Tuesday it was lifting an Imbalance Warning in all zones, but it continued to ask customers to match physical flow with scheduled quantities.

Pacific Gas and Electric did not extend a new systemwide high-inventory OFO beyond Tuesday.

Tennessee lifted a systemwide Imbalance Warning Monday but asked customers “to match physical flow with scheduled quantities and nominate all payback requests.”