CIL is charged of discriminating in favour of public sector firms in the reworked format of fuel supply agreements.
The deadline for these overseas mining firms for responding to CIL's EoI notice is August 31 this year.
State-run Coal India Ltd is likely to hit the market by the third week of October with India's largest ever public offer to raise up to Rs 15,000 crore (Rs 150 billion).
Top Indian private sector lender ICICI Bank, which owns nearly 68 percent of the insurer, is selling up to 181.34 million shares in the IPO.
Labour unions, with a history of hostility towards management, are pushing back on Coal India's plans, fearing modernization and outsourcing will hit jobs.
Jindal Steel and Balco emerged as the top bidders.
The hike in clean energy cess is likely to impact input cost for thermal power producers
Though the current National Democratic Alliance government has not endorsed the figure, it has not even repudiated it.