The Power Finance Corporation has reported that the aggregate technical and commercial (AT&C) losses of discoms have gone up from 20.7 per cent in 2019-20 to 22.3 per cent in 2020-21. The term AT&C is frequently used while talking about the power sector. What does it really mean? The AT&C estimate gives us an idea of the losses a distribution company (discom) faces in its line of business. In layman’s terms, if a discom has received 100 units of power, the AT&C figure will tell us how many units are not recovered in terms of revenue. So, a figure of 25 per cent would mean that for every 100 units of power fed into the discom, 25 units are not recovered.