The Transpower capital expenditure IM (capex IM) was set in January 2012 and has two major functions. These are to provide for the scrutiny of Transpower's proposed and actual investment, and to incentivise Transpower to deliver those investments effectively.
The input methodologies (IMs) were first determined in December 2010 for specified airport services, electricity distribution and transmission, and gas pipelines. We are required to review the IMs every 7 years. We completed our review in December 2016.