Linked here is Meridian Energy Limited's monthly operating report for the month of April 2025.
Key points this month include:
- In the month to 12 May 2025, national hydro storage increased from 77% to 88% of historical average
- South Island storage increased to 86% of average and North Island storage increased to 105% of average by 12 May 2025
- Meridian’s April 2025 monthly total inflows were 91% of historical average
- Waiau catchment inflows in April 2025 were 80% of historical average
- Meridian’s Waitaki catchment water storage at the end of April 2025 was 80% of historical average
- Water storage in Meridian’s Waiau catchment was 69% of average at the end of April 2025
- April 2025 was a very warm month, with temperatures well above average for most of the country. Rainfall was above normal for northern parts of both islands, with below normal
rainfall in the lower South Island - National electricity demand in April 2025 was 3.0% lower than the same month last year
- New Zealand Aluminium Smelter’s average load during April 2025 was 522MW
- Meridian’s retail sales volumes in April 2025 were 0.4% higher than April 2024
- Compared to April 2024, segment sales in residential were 1.5% higher, small medium business 4.7% higher, large business 15.4% higher, agriculture 26.2% lower and
corporate 4.6% higher
Weekly lake storage updates are available on Meridian’s website. See comparative lake levels at: www.meridianenergy.co.nz/power-stations/lake-levels