Inangahua - Reefton 110 kV line
The construction of the Inangahua - Reefton 110 kV line has eased transmission constraints and provided additional
security to the region from the north, and the proposed extension of this line through to Dobson will further enhance
supply to Greymouth and surrounding areas.
In addition, load forecasting is carried out at the Zone Substation level and this is critical to ensure that sufficient
capacity is available in Westpower sub-transmission and zone substation infrastructure.
These forecasts are developed using a zero-based approach from information and requests received directly from customers including intelligence
on future load trends such as proposed dairy farm conversions. A summary of the results shows that current maximum demand is around 43.7 MW and future demand by 2018
is expected to rise to over 80 MW.
In Westpower's case, most of the sub-transmission infrastructure has been built within the last 20 years and has
been prudently designed to cater for future load growth, which means that there is usually ample capacity to cater
for marginal load growth.