Egoli Gas (Pty) Ltd and the Industrial Gas Users Association of Southern Africa (IGUASA) lodged complaints with the Competition Commission alleging that Sasol Gas (Pty) Ltd, a dominant firm in the piped gas market, charged excessive prices in contravention of section 8(1)(a) of the Competition Act 89 of 1998. The complaints followed NERSA’s approval of a new maximum gas pricing methodology under the Gas Act 48 of 2001, which linked domestic prices to international benchmarks. The Commission initiated an investigation and issued a summons to Sasol for information. Sasol refused to comply and brought a review application seeking to set aside the Commission’s decision to investigate and to issue the summons, arguing that NERSA’s price regulation under the Gas Act excluded the Commission’s jurisdiction. After Part A interim relief proceedings, Part B of the review was transferred from the Competition Tribunal to the Competition Appeal Court for determination.