A key election policy of the opposition parties, Labour and the Greens, is to regulate the electricity market, creating a single state-owned wholesale electricity buyer, which would force down prices.
Online auction website Trade Me Group led the index higher, up 2.7 percent to $3.83. Fonterra Shareholders' Fund, which gives investors access to Fonterra Cooperative Group's dividend stream, gained 2.5 percent to $6.10. Brisbane-based jeweller Michael Hill International climbed 2.2 percent to $1.40.
Telecom was the day's worst performer, dropping 3.8 percent to $2.42. New Zealand's largest telecommunications provider shed rights to its interim dividend today.
Diligent Board Member Services declined 2 percent to $4.36. The company, which had to restate several years of financial statements after recognising revenue too early, said it will miss the March 31 deadline to file its annual report.
Xero, cloud-based accounting software firm, rose 1.9 percent to $44.45. Fletcher Building, New Zealand's largest listed company was unchanged at $9.74. Auckland International Airport declined 1.3 percent to $3.90.
Outdoor goods retailer Kathmandu Holdings fell 2 percent to $3.38, Warehouse Group, New Zealand's largest listed retailer was unchanged at $3.26. Clothing chain Hallenstein Glassons lifted 0.3 percent to $3.08.
Outside the benchmark index, children's clothing retailer Pumpkin Patch plunged 19 percent to a record low of 55 cents. The retailer reported a 98 percent decline in first-half earnings as declining sales in its largest market Australia were further impacted by a strong kiwi. It warned of continuing currency headwinds in its second-half.