Meridian Energy monthly operating report for August 2025

Attached is Meridian Energy Limited's monthly operating report for the month of August 2025.

Key points this month include:

• In the month to 8 September 2025, national hydro storage decreased from 87% to 79% of historical average.
• South Island storage decreased to 73% of average and North Island storage decreased to 98% of average by 8 September 2025.
• Meridian’s August 2025 monthly total inflows were 73% of historical average.
• Waiau catchment inflows in August 2025 were 67% of historical average.
• Meridian’s Waitaki catchment water storage at the end of August 2025 was 65% of historical average.
• Snow storage in Meridian’s Waitaki catchment was 78% of average in early September 2025.
• Water storage in Meridian’s Waiau catchment was 84% of average at the end of August 2025.
• August was a dry and cool month, with both rainfall and temperatures below average for most of the country.
• National electricity demand in August 2025 was 5.9% higher than August 2024.
• New Zealand Aluminium Smelters (NZAS) average load during August 2025 was 565MW.
• Meridian’s retail sales volumes in August 2025 were 12.8% higher than August 2024.
• Compared to August 2024, segment sales in residential were 35.3% higher (including Flick customers), small medium business 7.2% higher, large business 14.6% higher, agriculture 2.2% higher and corporate 4.3% higher.

Weekly lake storage updates are available on Meridian’s website. See comparative lake levels at:
www.meridianenergy.co.nz/power-stations/lake-levels

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