ESG Report | Water | Contact Energy

Water reported in Megalitres (ML)

Non-consumptive water usage

Source/water use	FY25	FY24	FY23	FY22	FY21	FY20
Clutha Mata-Au River water*	15,090,071	14,529,302	17,370,983	15,730,988	15,098,980	16,624,902
Geothermal reservoir	102,371	77,090	75,209	75,339	69,180	75,992
Geothermal cooling water*	313,000	310,501	316,530	332,270	336,840	330,047
Total	15,505,442	14,916,893	17,762,722	16,138,597	15,505,000	17,030,941

Total water withdrawal**

Source/water use	FY25	FY24	FY23	FY22	FY21	FY20
Geothermal reservoir	144,501	109,116	106,128	105,577	103,177	114,805
River and surface water*	2,112	2,576	1,641	2,076	2,509	1,536
Water from third parties*	-	-	245	294	321	283
Total	146,613	111,692	108,015	107,947	106,007	116,624

Total water discharge**

Source/water use	FY25	FY24	FY23	FY22	FY21	FY20
Discharge to rivers	15,752	16,579	15,974	15,533	18,727	15,476

Total water consumption

Source/water use	FY25	FY24	FY23	FY22	FY21	FY20
Geothermal reservoir **	27,942	17,825***	15,319	15,228	15,831	23,818
Council* **	66	9	21	23	40	34
Thermal cooling towers	551	201	212	632	942	801
Total	28,558	18,035***	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.}

_{*** Figures restated to correct calculation error.}