Sources said the agency has already scrutinized a number of documents and financial statements of these firms and it will soon register money laundering cases against them.
"Some information has been sought by the agency in this regard from the CBI which is also investigating the scam. Once all the information is shared between the two agencies, about 17 firms would be booked under the provisions of the Prevention of Money Laundering Act," a senior official said.
ED has, till now, registered 16 cases under PMLA to probe these allocations even as it recently questioned former Minister of State for Coal Dasari Narayan Rao who has been named along with other private parties in a case.
The agency has also seized assets worth nearly Rs 200 crore as part of these investigations till now.
"Some more attachments of assets, including immovable properties and fixed deposits of those individuals and companies named in the ED FIRs, will be carried out soon," the official said.
The firms against whom the new money laundering cases would be registered are located in various states of the country like Jharkhand, Odisha, Chhattisgarh and Maharashtra among others.
While the Supreme Court is monitoring the probe of both ED and CBI, the Special Investigation Team (SIT) on black money too is reviewing the overall investigations and coordination between the two central agencies in these cases.
The CBI has registered about 32 FIRs in the coal allocations case till now.

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