"July has been cooler and that will tend to lend itself to higher consumer demand," he said. "So we're expecting higher residential demand, but still relatively flat wholesale pricing."
In the wholesale market, prices are under pressure because of ample generation supply.
Trustpower chairman Dr Bruce Harker told the annual general meeting New Zealand generation production was 9 per cent below the long run average.
"All electricity retailers regardless of size, or whether they own generation or not, can purchase contracts and make a competitive retail price offer to customers," he said.
"And as importantly, anyone can be an electricity retailer."
However, Dr Harker said that Trustpower had continued to make good progress on its growth agenda over the 2014 financial year.
Total energy accounts increased to 238,000 at March 2014 (including 14,000 gas accounts) from 206,000 as at March 31, 2013 (nil gas accounts).
"While the retail market remained highly competitive ... Trustpower continued to experience lower levels of customer churn than the market overall," said Dr Harker.
In Australia, the construction of the 270MW Snowtown Stage 2 wind farm in South Australia is close to completion and Trustpower has completed the $72 million purchase of the assets of Green State Power with an aggregate capacity of 14.1 MW. The company has four other development approval applications in progress aimed at meeting the Australian Renewable Energy Target.
"Despite, or perhaps almost more because of, the scrapping of the carbon tax in Australia, the Renewable Energy Target is in our view likely to be supported as the main mechanism to do the heavy lifting in reducing the carbon intensity of Australia's electricity generation sector," said Dr Harker.
Trustpower Results (Financial Year Ending 31 March)
Consolidated profit after tax: $115.1 million (down 7 per cent on 2012-13).
Earnings: $277.4 million (before interest, tax, depreciation, amortisation, fair value movements of financial instruments and asset impairments) (down 6 per cent on 2012-13).