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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
Measure
Lake area (m2)
Clyde25,000,000
Roxburgh5,900,000
Nameplate capacity (W)
Clyde432,000,000
Roxburgh320,000,000
Power density (W/m2)*
Clyde17.3
Roxburgh54.2

* 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
Source/water use
Clutha Mata-Au River water*
FY2414,529,302
FY2317,370,983
FY2215,730,988
FY2115,098,980
FY2016,624,902
Geothermal reservoir
FY2477,090
FY2375,209
FY2275,339
FY2169,180
FY2075,992
Geothermal cooling water*
FY24310,501
FY23316,530
FY22332,270
FY21336,840
FY20330,047
Total
FY24
14,916,893
FY23
17,762,722
FY22
16,138,597
FY21
15,505,000
FY20
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
Source/water use
Geothermal reservoir
FY24109,116
FY23106,128
FY22105,577
FY21103,177
FY20114,805
River and surface water*
FY242,576
FY231,641
FY222,076
FY212,509
FY201,536
Water from third parties*
FY24-
FY23245
FY22294
FY21321
FY20283
Total
FY24
111,692
FY23
108,015
FY22
107,947
FY21
106,007
FY20
116,624

 



Total water discharge**


Source/water useFY24FY23FY22FY21FY20
Discharge to rivers16,57915,97415,53318,72715,476
Source/water use
Discharge to rivers
FY2416,579
FY2315,974
FY2215,533
FY2118,727
FY2015,476

 



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
Source/water use
Geothermal reservoir **
FY2416,460
FY2315,319
FY2215,228
FY2115,831
FY2023,818
Council* **
FY249
FY2321
FY2223
FY2140
FY2034
Thermal cooling towers
FY24201
FY23212
FY22632
FY21942
FY20801
Total
FY24
16,670
FY23
15,552
FY22
15,883
FY21
16,813
FY20
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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