Operating revenue increased “as a result of higher energy prices charged to those customers paying spot market prices through the first half of the year,” said chairman Bruce Harker. Lower-than-average lake levels through to September 2009 “elevated wholesale electricity prices for a number of months.”

Electricity revenue increased by 13% to $744.8 million, despite an 11% fall in volume sold to 4,032 gigawatt hours. TrustPower will pay a final dividend of NZD17, for an annual payout of 33 cents, up 10% from the previous year.