Power prices on the Chatham Islands are about to jump by a third because of high fuel prices. From the start of June, the price will go from around $1 a kilowatt hour to $1.32 kWh. That's more than three times the average price on the mainland, which is around 40 cents kWh. Chatham Islands Enterprise Trust chief executive Bob Penter said prices would be even higher without a wind farm that opened at the end of last year. "There's still a significant amount of our electricity on the island generated by diesel power through generators," Penter said. "We don't have 100 percent renewable energy on the Chathams at the moment, so we are still reliant on those diesel generators when the wind isn't blowing." Penter said the Chathams was about three times as reliant on diesel as the rest of the country, so they'd had significant price increases at the petrol pump and to generate electricity.…