Both Fitch Ratings and ICRA said after cancellation of blocks the companies will have to depend on externally sourced coal, resulting in higher operating costs which which further would put pressure on retail tariffs for the consumers.
The reports follow the Supreme Court earlier this week scrapping the allocation of 214 out of 218 coal blocks to various companies since 1993 terming it as "fatally flawed".
"The SCI's decision also levies a fine of Rs 295 per tonne on coal produced to date from the mines affected, which could amount to Rs 7,300 crore," Fitch ratings said in a statement.
The negative financial impact will vary significantly depending on the company, it said adding the ruling has no immediate direct impact on Tata Steel and SAIL.
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The company had expected that its captive mines would be able to serve 4.3 per cent of its coal requirements in FY15 - rising further to 15 per cent by FY17."
The potential long-term effects of the decision on the wider power and steel sectors will depend largely on how quickly the government proceeds with re-auctioning the licences, it said.
About 60 per cent of this penalty is attributed to state sector utilities/JVs, mainly owned/co-owned by corporations belonging to the states of Punjab, West Bengal, Karnataka and Rajasthan; while balance 40 per cent pertains mainly towards private sector IPP/utilities, it said.
It added taht the overall capacity in private IPP segment that would be affected by the SC order is around 18 GW, comprising a mix of operational projects (6.3 GW as on July 2014) and under-construction projects (11.4 GW expected to become operational over the next 2 year period).