Agency sources said the case against the company has been registered for alleged criminal conspiracy, criminal breach of trust and under provisions of Prevention of Corruption Act.
They said the allegations pertain to excess mining of coal beyond the approved quantum from Gare Palma-4 coal block in Raigad in Maharashtra and its consumption in captive power plant in an irregular manner.
Agency teams carried out coordinated searches at the firm's office in Nagpur, two places in Raipur and one place in Raigad, they said.
Company officials said they will give their comment once the searches were over.
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