Energy companies rose as investors weighed the likelihood of the incumbent National-led government returning for a third term. Opposition parties have promised to restructure New Zealand's energy market, creating a central buying agency to push down retail energy prices which has weighed on the government's partial privatisation of the power companies.
Contact rose 1.7 percent to $5.44. Genesis gained 0.6 percent to $1.81. MightyRiverPower advanced 0.2 percent to $2.27. Vector, the Auckland lines company, increased 0.8 percent to $2.55
Meridian climbed 1.2 percent to $1.245, after the electricity retailer and generator said record warm temperatures had driven a three percent drop off in electricity demand in June compared to last year, while it also recorded a 1.8 percent decrease in average retail contracted sales price in the year ended June 2014.
Trade Me Group, the online auction site, rose 0.6 percent to $3.55 on news potential competitor Wheedle will close after investor Neil Graham invested more than $10 million in the company, Williamson said.
Kathmandu Holdings, the outdoor goods retailer, led the benchmark index higher, up 2.5 percent to a two-week high of $3.32. Fisher & Paykel Healthcare rose 0.7 percent to $4.66.
Fletcher Building, New Zealand's biggest listed company, rose 0.3 percent to $8.88. Xero, the cloud-based accounting software firm, advanced 2 percent to $25.25.
Of the day's few decliners, OceanaGold was the worst performer on the benchmark index, down 1.4 percent to $3.59.
Infratil fell 1.2 percent to $2.45. The infrastructure investor said it will make a final decision on the future of its Australian energy assets in September.