P - Transmission

AECOM Puketoi Wind Farm Technical Report 11.0 IntroductionMighty River Power (MRP) has proposed to develop a wind farm on agricultural land in the Puketoi Range,located approximately 40km south east of Palmerston North.Figure 1 Proposed Wind Farm SiteThe wind farm is proposed to contain up to 53 turbines, each with up to 6.15 MW generating capacity. Electricitygenerated will be collected by combinations of 33kV overhead lines and underground cables and then fed into theNational Grid via a 220kV overhead transmission line. The purpose of this report is to provide information for thewind farm consent application.MRP is cognisant of other potential generation projects (both consented and in consent processes) in the widerPuketoi area, and wishes to ensure that environmental effects associated with more than one transmission linebetween the existing 220kV infrastructure near Palmeston North and the Puketoi area are avoided. Accordingly,MRP wishes to ensure that the capacity of the proposed 220kV transmission line is sufficient to accommodate allPuketoi-area generation, if this proves to be the most environmentally and commercially sensible outcome. Thetotal Puketoi area potential generation is understood to sum to around 1332MW, which has driven the selection ofthe conductor. Sufficient infrastructure is to be provided at the Puketoi substation on the 220kV side to allow forother projects to connect.This report covers 220kV infrastructure from the proposed Turitea plantation substation on the Tararua Range, tothe proposed Puketoi substation. The Turitea substation and the 220kV line between the Turitea PlantationSubstation and the National Grid at Linton are addressed in the resource consent applications for the Turiteaproject.This report provides details on the following aspects of the transmission network associated with the proposedwind farm and covers the design methodology in order to complete the developed design of the Puketoi WindFarm:- 220kV overhead transmission line (OHL)- 33kV overhead transmission line (OHL)- 33kV underground cable routes- 33/220kV substation layout and conceptual design- Environmental effects of the transmission system including;