Gordhan also attached a report to deal with the R4bn overpayment on the construction of the Kusile Power Station.
The report, provided by Eskom, indicated the firms and contracts that received overpayments.
It also detailed the status of the employees responsible for overpayments, the current status of the recovery of funds and the cases which have been referred to the National Prosecuting Authority.
The power utility said the investigations it was conducting, together with the Special Investigating Unit and law firm Bowmans, were ongoing and incomplete at this stage.
It listed four contractors involved in these investigations and the estimated overpayment amounts.
They are ABB (estimated overpayment R1bn), Tenova Mining (R735m), Tubular Construction Projects (R1bn) and Steffanuti Stocks Basil Read JV (R1bn).
The report also mentioned various site service contracts outside the scope of the SIU involving estimated overpayments of R180m.
On the ABB contract, Eskom said the company was appointed using a closed tender procurement strategy.
However, once the execution of works commenced, ABB was issued four variation orders with no substantiation documentation or records.