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Appendix 5: Energy

Table 6: Existing hydro generation by catchment

Rank Catchment name Existing (GWh per annum) % of GWh per annum
1 Waitaki 7,612 33.0%
2 Waikato 6,349 27.5%
3 Clutha 3,378 14.6%
4 Waiau (Southland) 3,180 13.8%
5 Wairoa (Hawke's Bay) 625 2.7%
6 Rangitaiki 540 2.3%
7 Taieri 425 1.8%
8 Rakaia 197 0.9%
9 Manawatu 166 0.7%
10 Takaka 140 0.6%
11 Patea 134 0.6%
12 Rangitata 118 0.5%
13 Wairau 59 0.3%
14 Taramakau 46 0.2%
15 Mokau 28 0.1%
16 Waitara 21 < 0.1%
17 Waiwhakaiho 20 < 0.1%
18 Wairoa (Northland) 13 < 0.1%
19 Whanganui 7 < 0.1%
20 Ruamahanga 4 < 0.1%
21 Mataura 4 < 0.1%
  Total 23,066 100%

Table 7: Potentially nationally important water bodies for existing energy generation

Rank Catchment name Existing (GWh per annum)
1 Waitaki 7612
2 Waikato 6349
3 Clutha 3378
4 Waiau (Southland) 3180
5 Wairoa (Hawkes Bay) 625
6 Rangitaiki 540
7 Taieri 425

Table 8: Potentially nationally important water bodies for potential energy generation with a medium probability of proceeding by 2025

Rank Catchment name Potential (GWh per annum)
1 Waitaki 3208
2 Clutha 1950
3 Grey 1546
4 Waiau (Canterbury) 1030
5 Ngaruroro 585
6 Wairau 526
7 Whanganui 476
8 Waiau (Southland) 350
9 Hurunui 350
10 Mohaka 330

Table 9: Existing energy generation by geothermal field

Rank Catchment name Existing GWh per annum Exceeds 230 GWh per annum
1 Wairakei 1,734 Yes
2 Ohaaki 820 Yes
3 Mokai 434 Yes
4 Rotokawa 221 No
5 Kawerau 118 No
6 Ngawha 71 No

Table 10: Potential energy generation by geothermal field with a medium probability of proceeding by 2025

Rank Geothermal field name Potential GWh per annum Exceeds 230 GWh per annum
1 Kawerau 2,810 Yes
2 Rotokawa 2,390 Yes
3 Wairakei 1,430 Yes
4 Ngatamariki 1,104 Yes
5 Mokai 770 Yes
6 Tauhara 550 Yes
7 Mangakino 512 Yes
8 Ngawha 500 Yes
9 Rotoma 280 Yes
10 Tikitere-Taheke 80 No
11 Horohoro 70 No