Contact Energy, the country's biggest listed electricity generator, gained 2.1 per cent to $5.29.
"It has been a bit out of favour of late but their operational data was better and the delay in Mighty River Power has seen people return to the stock," said Vault.
Telecom, New Zealand's largest listed company, rose 0.9 per cent to $2.33 after it shed its dividend of 11c a share. The telecommunications company also named Chris Quin as chief executive of its retail unit, effective October 1.
Port of Tauranga, the nation's busiest port, gained 2 per cent to $12.95, the stock having climbed about 30 per cent this year. It shed its final dividend of 27c apiece yesterday.
The gainers were led by the NZX, the stock exchange regulator, up 2.7 per cent to $1.13.
The decline was led by NZ Refining, which fell 3.5 per cent to $2.74, and Heartland New Zealand, the lender formed from the merger of Pyne Gould's Marac Finance with the Canterbury and Southern Cross building societies, down 1.6 per cent from its 11 month high to 62c.
Mainfreight, the biggest road transport company listed on the NZX 50 index, dropped 1.2 per cent from its 13-month high to $10.50. The stock has risen about 6.1 per cent this year.
Tech stock Diligent Board Member Services fell 0.3 per cent to $3.84, while Trade Me, the online auction site controlled by Fairfax Media, slipped 0.8 per cent to $3.99.
Ryman Healthcare, New Zealand's largest retirement village operator, fell 0.8 per cent to $4.09.