On 27 September 2012 Transpower submitted to the Commission a proposal to increase the major capex allowance for the Otahuhu Substation Diversity project to $106.1 million (2009 dollars).
The former Electricity Commission approved a maximum of $99 million (in 2009 dollars) for this proposal on 31 August 2007.
On 12 June 2006, an equipment failure at the Otahuhu substation resulted in a widespread loss of supply of electricity to Auckland and Northland. Following this incident, Transpower implemented the Otahuhu Substation Diversity Project to improve the reliability of supply into Auckland and Northland. Transpower commissioned the last asset in November 2011.
The Commission made its decision to amend the major capex allowance for the Otahuhu Substation Diversity project to $106.1 million (2009 dollars) on 12 April 2013.
