Water

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Hydro power density

MeasureClydeRoxburgh
Lake area (m2)25,000,0005,900,000
Nameplate capacity (W)432,000,000320,000,000
Power density (W/m2)*17.354.2

* Hydropower Sustainability Standard requires a power density greater than 5W/m2.

  • Water reported in Megalitres (ML)



Non-consumptive water usage


Source/water useFY24FY23FY22FY21FY20
Clutha Mata-Au River water*14,529,30217,370,98315,730,98815,098,98016,624,902
Geothermal reservoir77,09075,20975,33969,18075,992
Geothermal cooling water*310,501316,530332,270336,840330,047
Total
14,916,893
17,762,722
16,138,597
15,505,000
17,030,941

 


Total water withdrawal**


Source/water useFY24FY23FY22FY21FY20
Geothermal reservoir109,116106,128105,577103,177114,805
River and surface water*2,5761,6412,0762,5091,536
Water from third parties*-245294321283
Total
111,692
108,015
107,947
106,007
116,624

 



Total water discharge**


Source/water useFY24FY23FY22FY21FY20
Discharge to rivers16,57915,97415,53318,72715,476

 



Total water consumption


Source/water useFY24FY23FY22FY21FY20
Geothermal reservoir **16,46015,31915,22815,83123,818
Council* **921234034
Thermal cooling towers201212632942801
Total
16,670
15,552
15,883
16,813
24,653

* Freshwater

** Measures previously reported under 'discharge' and 'withdrawal' have been restated as 'consumption'. Figures include evaporation from cooling towers, soakage to land, steamfield traps and other minor miscellaneous consumption.

Water volumes for our operations are recorded onsite via meters that measure flow. The flow inlet and outlet determines categorisation of water use, for instance, geothermal fluid outlets to rivers are categorised as 'Discharge to rivers'. Geothermal reservoir consumption is comprised of evaporation / land soakage. Tauhara water use for plant commissioning has been excluded.

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