On 14 April 2015, Carl Hansen wrote to Transpower CEO Alison Andrew regarding approval and referral back of components of Transpower's proposed variation to the Transmission Pricing Methodology. 

Additional correspondence with Transpower regarding their proposed variation. 

 On 8 May 2015, Transpower CEO Alison Andrew wrote to Carl Hansen regarding the referral back of components of Transpower's proposed variation to the Transmission Pricing Methodology.