It had reported Rs 240 crore net profit in the July- September quarter of the last fiscal.
"During the second quarter of 2014-15, sales turnover stands at Rs 1,402.49 crore as compared to Rs 1,382.82 crore for the same period in the previous year," the company said in a statement.
Neyveli operates three lignite mines with a total capacity of 30.60 million tonnes and three thermal power stations with a total installed capacity of 2,740 MW.
"During the first half of the financial year 2014-15, NLC has generated 9,983.10 million units of power, achieving 100.04 per cent of the set target," it said.