Mercury NZ Limited revised earnings guidance for the year 2018. The company announced that it has lifted its financial year 2018 EBITDAF guidance from $515 million to $530 million. This is due to an expected 150 GWh increase in full year forecast hydro generation due to continued wet weather in the Taupo area. Annual hydro generation is now forecast to be 4,550 GWh for the financial year, or 550 GWh above average.