 McKinsey denied the allegations, stating that their price was "in line with similar projects we, and other firms, undertake in South Africa and elsewhere around the world.”

Eskom then commissioned Oliver Wyman to investigate its contract with McKinsey.Oliver Wyman's final report found that the fee structure was "very unusual", raised multiple concerns regarding billing, and advised the company to take legal action against McKinsey and Trillian.After receiving the report, Eskom made false statements to the South African newspaper "Business Day" about its conclusions, claiming that Oliver Wyman found that all payments were fair.