"The continuing decline in coal volumes, at a more rapid rate, as compared to the previous periods, is a concern over the long term for the port sector," ICRA Senior Vice-President and Group Head (Corporate Ratings) K Ravichandran said in a statement.
The prolonged drop in coal imports can affect returns of such players, the agency said.
In the April-August period of FY2018, the volume growth at major ports was low as coal volumes recorded 12 per cent decline during the said period.
The port sector will continue to experience healthy growth in cargo in the near term, it said.
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