It is unfortunate that in addition to T&D losses, there is also a loss in revenue due to non-realisation of billed demand , which leaves a portion of the units billed as unrealised units . This commercial loss is in addition to the commercial losses up to the point of billing discussed in Sec.10.2. The aggregate of T&D loss and loss due to non-realisation of billed demand is termed as “AT&C loss” (Aggregate Technical and Commercial loss). The T&D losses have always been computed taking into account electricity bills issued to consumers as accrued income and not on actual collection.Therefore, T&D loss figures do not capture the major gap between the billing and the collection, apart from the large amount of theft not captured in billing.The AT & C losses take this gap into account. Thus,AT&C loss to the utility is the sum total of technical losses, commercial losses and loss due to non-realisation of total billed units. AT&C loss for a year is also expressed as percentage of Energy Input. It is the difference between units injected into the system and the units for which the payment is collected.
AT&C loss is a transparent measure of the overall efficiency of the distribution business as it measures technical as well as commercial losses. The schematic diagram shown below captures the essential components of AT&C losses and is translated in terms of units both at the physical level of transmission and distribution and at the financial level of billing and collection.
AT&C loss is a transparent measure of the overall efficiency of the distribution business as it measures technical as well as commercial losses. The schematic diagram shown below captures the essential components of AT&C losses and is translated in terms of units both at the physical level of transmission and distribution and at the financial level of billing and collection.
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| Schematic Diagram Showing Components of AT&C loss |
The concept of AT&C loss was introduced in 2001-02. The AT&C losses are presently in the range of 18% to 62% in various states. The national average AT&C loss of the distribution companies in the year 2002-03 was 36.63% and has reduced to 33.82% in the year 2004-05. There is wide variation of losses among the states and variation among the Discoms within the states. The AT&C losses for the Distribution utilities for the years 2002-03 to 2004-05 are given in Annexure II .
The method of calculating AT&C loss is given in Box.
Box : Calculation of AT&C Loss
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