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New Zealand’s Meridian reports higher hydro storage

  • Market: Coal, Electricity, Natural gas
  • 15/05/26

New Zealand utility Meridian Energy reported higher hydropower storage levels and stronger electricity demand in April, as the country heads into the winter peak demand season with well-supplied generation reserves, it said today.

Meridian Energy generated 1,009GWh of electricity in April, up by 13.5pc from 887GWh a year earlier, reflecting stronger hydro generation despite weaker wind output.

National hydro storage increased to 119pc of the historical average on 11 May from 106pc on 13 April. South Island storage reached 109pc of average levels, while North Island storage surged to 201pc of average following heavy rainfall events.

The elevated storage levels could reduce pressure on New Zealand's major non-renewable electricity generator, the 953MW Huntly power station on the North Island operated by Genesis Energy, which can run on coal or gas.

Genesis cut its combined coal- and gas-fired output at Huntly by 45pc year-on-year to 869GWh in July–December 2025, explicitly attributing the reduction to increased hydroelectric generation. Coal- and gas-fired output from Huntly's Rankine units fell from 812GWh to 242GWh over that period, while output from its gas-fired units dropped from 755GWh to 627GWh.

The four major New Zealand utilities — Genesis, Mercury, Meridian and Contact — agreed to underpin a coal-fired power reserve at Huntly, offering 150MW of Huntly Firming Options (HFOs) to market participants from 1 January to provide system security when hydro, gas and wind supplies are limited. Genesis has also set aside up to 600,000t of coal for dry winter conditions, with the HFOs intended to help limit wholesale power price volatility during peak winter demand.

Genesis is also set to commission a 200MWh battery system at Huntly in July–September, coinciding with the peak winter demand period.


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