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.
On this page you will find the final decisions on the 2015/16 IM review.
In December 2016 we reached decisions on all IMs within the scope of the 2015/16 IM review, except for three areas:
we reached decisions on the Transpower Incremental Rolling Incentive Scheme (IRIS) in June 2017
we reached decisions on the customised price-quality path (CPP) information requirements for gas in December 2017
we reached decisions on the related party transaction provisions in December 2017.
