The power transmission utility had a net profit of Rs 1,129.06 crore in the same period a year ago, according to a regulatory filing today.
However, total income from operations jumped to Rs 3,684.55 crore in the third quarter of current financial year from Rs 3,368.93 crore in the year-ago period.
The company's finance costs rose to Rs 787.35 crore in the latest December quarter from Rs 684.82 crore in the year-ago period.
Shares of the company rose over one per cent to close at Rs 96.55 on the BSE.