Eskom CEO Brian Molefe and chair Ben Ngubane defended Eskom to the Public Enterprises Portfolio Committee in Parliament on Wednesday.
Earlier this week, Treasury said it had met with resistance from Eskom when it requested documents on coal contracts with Gupta owned Tegeta.
Eskom denies this, saying all documents were sent to Treasury by close of business on Tuesday.
Molefe explained that Treasury had requested the documents go before the Eskom Board first, and that meeting is only scheduled for 21 September, that's why there had been a delay.
EWN Parliamentary correspondent, Gaye Davis, says Molefe gave a "very upbeat presentation on operational status" to the Portfolio Committee.
MPs asked a range of questions about Tegeta and Ngubane "told MPs to stop listening to lies", says Davis.
The Eskom heads appealed to MPs for help to stop what they view as a campaign against Eskom.
He says if he has been captured by anything, it is the Constitution, and not the State.
Molefe said people should be thankful for the current Eskom leadership that has changed people's lives and brought investment to South Africa.
He denied anything sinister took place in the Tegeta deal. The coal initially found to be of poor quality was then sent to SABS for testing and that report said the coal standard was good.
Molefe strongly defended Eslom's right to do business with the Guptas until there were grounds for blacklisting the family, and repeated the claim that the family has been subjected to a kangaroo court.
The gloves are now off. Eskom has it's ducks in a row in terms of defending it. They are hitting back at Treasury for trying to paint them as a captured State Owned Enterprise.— Gaye Davis, EWN senior parliamentary correspondent
Listen to the full interview below: