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Electricity output by primary energy source


GWh FY26 FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17 FY16 FY15 FY14
Thermal generation 229 1,088 1,619 517 1,046 1,592 1,360 1,421 1,812 1,742 1,614 2,321 2,865
Hydro generation 5,033 3,297 3,628 3,919 3,940 3,698 3,752 4,231 3,479 3,562 4,091 4,119 4,058
Geothermal generation 4,914 4,543 3,389 3,185 3,283 3,114 3,333 3,256 3,323 3,233 3,297 3,074 2,322
Total 10,176 8,928 8,636 7,622 8,269 8,404 8,445 8,908 8,614 8,537 9,002 9,514 9,245



Geothermal generation


Please refer to the Sustainable Finance webpage

 


Installed capacity of operated generation assets


  • Installed capacity of operated generation assets
  • Pool generation volume
  • Equivalent availability factor


Hydro - Clutha mata-au



 FY26 FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17
Net capacity (MW) 748 784 784 784 784 784 784 784 784 784
Availability (%) 87% 87% 90% 84% 83% 84% 92% 97% 95% 92%
Capacity factor (%) 50% 48% 53% 57% 57% 54% 54% 62% 51% 52%
Electricity output (GWh) 3,459 3,297 3,628 3,918 3,939 3,698 3,752 4,231 3,479 3,562
Pool revenue ($/MWh) 77 163 164 74 121 167 90 123 78 47
Pool revenue ($m) 265 538 594 290 478 617 338 521 271 169



Hydro - Other



 FY26
Net capacity (MW)
502
Availability (%)
84%
Capacity factor (%)
39%
Electricity output (GWh)
1,573
Pool revenue ($/MWh)
92
Pool revenue ($m)
145

Represents the weighted average of all hydro assets acquired in the purchase of Manawa Energy in July 2025.


Geothermal



 FY26FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17
Net capacity (MW) 635625 586 410 425 425 425 425 425 429
Availability (%) 92%90% 94% 94% 97% 89% 95% 92% 96% 91%
Capacity factor (%) 88%84% 56% 89% 91% 84% 89% 87% 89% 86%
Electricity output (GWh) 4,9144,544 3,388 3,186 3,284 3,114 3,333 3,256 3,323 3,233
Pool revenue ($/MWh) 73186 177 80 140 175 99 133 80 55
Pool revenue ($m) 360845 601 254 458 546 330 434 267 177



Taranaki combined cycle (TCC)



 FY26FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17
Net capacity (MW) 377377 377 377 377 377 377 377 377 377
Availability (%) 93%89% 85% 85% 84% 89% 88% 63% 68% 90%
Capacity factor (%) 9%21% 5% 5% 20% 34% 26% 31% 32% 31%
Electricity output (GWh) 147692 1,395 161 672 1,126 870 1,031 1,071 1,021
Pool revenue ($/MWh) 183331 184 107 180 193 120 115 102 64
Pool revenue ($m) 27229 257 18 121 217 104 117 110 65



Stratford Peakers



 FY26FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17
Net capacity (MW) 202202 202 202 202 202 202 202 202 202
Availability (%) 85%70% 50% 77% 53% 90% 80% 64% 79% 92%
Capacity factor (%) 4%22% 12% 8% 10% 13% 16% 12% 30% 30%
Electricity output (GWh) 81378 221 145 176 232 289 206 526 495
Pool revenue ($/MWh) 122217 175 207 212 230 161 185 114 70
Pool revenue ($m) 1082 39 31 38 54 47 38 60 35

 


Whirinaki



 FY26FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17
Net capacity (MW) 158158 158 158 158 158 158 158 158 158
Availability (%) 95%92% 97% 82% 95% 94% 98% 98% 99% 99%
Capacity factor (%) 0%1% 0% 0% 0% 0% 0% 0% 0% 0%
Electricity output (GWh) 0.418 1 1 3 17 2 5 3 1
Pool revenue ($/MWh) 92667 747 491 597 410 293 472 656 2108
Pool revenue ($m) 0.0312 1.1 1.2 2.4 7.5 1 2.5 1.7 1



Te Rapa (spot generation only)



 FY23 FY22 FY21 FY20 FY19 FY18 FY17
Net capacity (MW) 41 41 41 41 41 41 41
Availability (%) 92% 95% 93% 98% 96% 87% 98%
Capacity factor (%) 30% 54% 58% 51% 54% 59% 63%
Electricity output (GWh) 107 195 208 184 195 211 226
Pool revenue ($/MWh) 94 145 174 106 160 94 58
Pool revenue ($m) 12 28 37 21 31 20 13

Note: Te Rapa has ceased operation from June 2023

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