Incidentally, both power and coal ministries are headed by Piyush Goyal.
"Supply of excessive stones and boulders especially from BCCL (Bharat Coking Coal Limited), a Coal India subsidiary, is a matter of concern. It results in high detention of railway rakes and damage to coal handling system of power plants," says a Power Ministry document.
The mechanism for third party sampling of coal quality, which was introduced in October last year at loading points, could not address the quality issue and so there is a "need to be done at unloading point," the document said.
The issue of coal quality last year had resulted in a standoff between the country's largest power producer NTPC and the world's largest coal producer Coal India (CIL).
Last year NTPC had alleged that it was being supplied inferior quality of coal.
This was followed by CIL stopping coal supplies to NTPC's plants saying the power major owed huge dues to the coal PSU.
After the government's intervention it was decided that third party mechanism would be introduced to check the quality of coal.
