Company sources told PTI that dispatch of coal and coal products to "power utilities" came down by 2.28 million tonnes (mt) or 6.8 per cent compared to 33.27 mt in the same period of 2015-16.
The dispatch figure for March, however, was marginally lower by 1.8 per cent at 36.1 mt compared with 36.8 mt during the same month a year ago.
"Power sector constitutes to around 78 per cent of CIL's overall coal off-take. Brimming over with coal has also led to coal stock piling up at pit-heads - a situation that CIL wants to avoid," officials said.
CIL supplied 407.9 mt of fuel to the power sector in 2015-16, up by 5.8 per cent compared to the previous year's dispatch of 385.4 mt of the fossil fuel in 2014-15.
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Total coal dispatch by the miner was 42.46 mt for April, 2016 to its consumers, which is lower by 1.06 mt compared to 43.52 mt in the corresponding month of 2015-16.
The company's production grew at 8.5 per cent to 536 mt in 2015-16 but missed the target of 550 mt.
Currently stock lifting is inadequate and CIL's current challenge is to liquidate its stock and the company is pushing the coal through e-auction and proactive marketing measures, CIL officials said.
CIL began the current fiscal with around 57.67 mt coal stock and managed to reduce it to 55.31 mt at end April 2016.