"Whatever you have to say, you say in an application," a bench comprising Chief Justice G Rohini and Justice Rajiv Sahai Endlaw said.
"Twenty persons (of CAG) are still waiting to get the complete documents from the power distribution companies. The auditing process is not moving in last three months," Gaurang Kanth, appearing for the top accounting body, said.
The court then asked the counsel for the CAG to file an application and fixed the matters for hearing on May 12.
The discoms have moved the larger bench of the court against its single judge's January 24 order refusing to stall the CAG audit of the discoms and asking them to cooperate with the top auditor by furnishing the details sought.
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Earlier, the court had asked the three discoms to "fully cooperate with the Comptroller and Auditor General in the audit process."
Advocate Prashant Bhushan, appearing for the NGO, had said that a DERC audit of a discom had revealed huge amount of fudging of accounts and the NGO had also sought action against those involved.
The three private firms had come into being in 2002 when the then Delhi government decided to privatise power distribution.
Delhi discoms are a 51:49 per cent joint venture between the private companies and the Delhi government.