Auckland-based Mercury has swapped its Roman god logo for a bee.
Mighty River Power - the listed generator that is part of the company - has also been branded Mercury with a new share market ticker code.
Chief executive Fraser Whineray said the change signals a new era of benefits for Kiwi consumers and the country from renewable energy and rapid advances in technology.
Extensive market research with customers showed very strong engagement with Mercury's new direction and the new 'bee' logo, Whineray said.
"We chose the bee to symbolise all the wonderful things we want to be and do for New Zealanders. The bee is Kiwi to the core. It's optimistic, energetic and quietly busy making the world a better place,'' .