Its net profit in the January-March quarter of the previous fiscal, 2013-14, was Rs 3,093.54 crore.
The company's turnover also declined to Rs 19,314.58 crore in January-March quarter of 2014-15, from Rs 20,939,08 crore in the year-ago period.
NTPC said in a statement that as per power sector regulator Central Electricity Regulatory Commission's (CERC) tariff regulation effective from 2014-15 to 2018-19, the financial incentives are to be based on actual generation of power than on the basis of available generation capacity.
In present scenario, as discoms (power distribution firms) always have funds crunch to buy electricity, power producer's generation capacity remains below the installed capacity.
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NPTC has filed a petition in the Delhi High court, contesting Regulation 2014 of CERC, said the statement.
Also, NPTC said it has revised its accounting policy for depreciation of certain assets in alignment with Schedule-II of the Companies Act 2013 effective from April 1, 2014.
"Consequently profit for the year ended March 31, 2015, lower by Rs 14.97 crore and fixed assets as at March 31, 2015 are lower by Rs 20.44 crore," the statement said.
The net profit was at Rs 10,974.74 crore in 2013-14.
Company's consolidated net profit also dropped to Rs 9,986.34 crore in 2014-15, from Rs 11,403.61 crore in 2013-14.
However, consolidated total income has increased to Rs 82,700.95 crore in 2014-15 from Rs 81,710.75 crore 2013-14.
The company's plant load factor (PLF) during January-March quarter was 82.88 per cent for coal based plants and 26.68 per cent for gas-based plants. The PLF was at 88.70 per cent and 35.64 per cent respectively in same period a year ago.
PLF is a measure of average capacity utilisation.
The power company has total installed power generation capacity of 44,398 MW. During 2014-15, its average tariff was Rs 3.28 per unit.
NPTC shares closed 1.26 per cent higher at Rs 136.70 a piece on BSE today.