The Authority has published a letter sent to Transpower on 18 March 2021 regarding the application of the proposed TPM’s provisions relating to the residual charge to grid-connected batteries and similar storage. The respective Transpower and Authority TPM  teams have been discussing this issue from time to time since mid-November 2020, when Contact Energy wrote to the Authority outlining its concerns and particularly following the Authority’s response to Transpower’s Checkpoint 2A submission on 7 December 2020.