The state-run company had a consolidated net profit of Rs 3,085.58 crore in the same period a year ago.
These figures have been calculated after taking into account taxes, minority interest and share of profit/(loss) of associates.
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According to a regulatory filing, the firm's total income fell to Rs 7,617.23 crore in the last financial year from Rs 8,158.72 crore in the 2011-12 period.
On standalone basis too, the company's net profit slumped 15% to Rs 2,348.22 crore in the last financial year. In 2011-12 period, net profit was at Rs 2,771.77 crore.
In the last fiscal, the total income dropped to Rs 6,299.42 crore from Rs 6,721.88 crore in the same period a year ago.
NHPC's board of directors has recommended a final dividend of Rs 0.60 per share.
Shares of the company rose over one% to close at Rs 20 on the BSE today.