Unaccounted For Gas (UFG)
As Unaccounted For Gas (UFG), over a specific time period, is defined to be the Quantity of Natural Gas that results from the NNGTS balance due to the uncertainty in the determination of measured and calculated values included in the said balance. The UFG can be positive, negative or null and is calculated according to the provisions of the article 60A of the Code for the Administration of the National Natural Gas System.