The company's consolidated net profit for the corresponding quarter of the previous fiscal was Rs 78.28 crore, Thermax Ltd said in a statement.
Total income of the company also declined to Rs 1,056.65 crore in the quarter under review from Rs 1,131.85 crore a year ago.
"For the second quarter of fiscal 2017-18, on a consolidated basis, Thermax posted an operating revenue of Rs 1,033 crore, compared to Rs 1,096 crore for the previous years corresponding quarter" the statement said.
Net profit for the half-year period was down 24 per cent at Rs 97 crore from Rs 127 crore a year ago.
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The current figures of revenue, at the Group and standalone basis, are exclusive of Goods and Service Tax (GST) while last year's figures include excise duty, and hence they are not comparable, it said.
As on September 30, 2017, Thermax has an order backlog of Rs 4,819 crore, against Rs 3,917 crore in September 2016. Compared to previous years Rs 4,257 crore, the Group order backlog stands at Rs 5,261 crore, it said.
Thermax has already recognised impairment in the carrying value of its investment in the JV in Q4 of 2016-17.