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New Zealand: Existing Transmission Network Capacity [free access]

January 12, 2017

New Zealand has two power grids, one each for the two islands—the North Island and the South Island. The core of the national grid is the 220 kV network in each island and the high voltage direct current (HVDC) link (350 kV) between them. The 220 kV lines connect the largest power stations with the main load centres. Provincial centres and smaller power stations are connected by transmission lines operating at 220 kV, 110 kV, 66 kV and 50 kV.

 

The country’s transmission infrastructure remained virtually stagnant in the period between 2011 and 2015. The country has over 11,646 km of transmission lines operating at the 350 kV direct current (DC) and the 220 kV, 110 kV, 66 kV, 50 kV alternating current (AC) voltage levels. The number of substations fluctuated between 182 and 169 through this period.

Table 1: Growth in New Zealand's transmission line length (km)

 

2011

2012

2013

2014

2015

Line length (km)

11,812

11,730

11,730

11,764

11,646

Source: Transpower

 

Figure 1: Growth in New Zealand's number of substations

fig_2_628