By Alister Doyle, Environment Correspondent OSLO (Reuters) - A planned building in Norway will be at the most northern location so far to generate more energy than it uses, demonstrating that "green" buildings can work anywhere, its backers said on Friday.

A group including Norwegian aluminum maker Norsk Hydro and Swedish construction group Skanska said it would construct the six-to-seven-story building in Trondheim, with offices and shops covering up to 9,000 sq meters (96,880 sq ft).