On 18 May 2018, we released our final decision on TransGrid's transmission determination for the 2018–23 regulatory control period. We also published a fact sheet to accompany and summarise our final decision. Our final decision is set out in the Overview and accompanying attachments. As a number of issues were settled at the draft decision stage or required only minor updates we have not prepared all attachments. In these circumstances our draft decision reasons form part of this final decision.