EMCa provided network regulatory economic advisory services to the New Zealand Commerce Commission over a period of four years. This work covered a range of issues addressed in regulatory network pricing determinations. This included developing a regulated Information Disclosure Regime for the 29 electricity distribution networks, advising on matters relating to assessments of “excess returns” including the specification of WACC, allowance for tax, regulated asset base (RAB) roll-forward mechanisms and risk and incentive mechanisms in the regulatory framework. This work also included advice on the extent to which the NZ gas networks had earned “excess returns” as input to consideration of enhancements to the regulatory regime.