Prime Minister John Key says the emissions trading scheme does not justify power price hikes.

The family of Auckland woman Folole Muliaga plan to sue both Mercury Energy and Middlemore Hospital over her 2007 death.

Power companies have hit back at claims that dirty tricks are being used stop customers switching suppliers.

NZX's plans to base its future growth on derivatives have taken a serious knock.

Two big power suppliers have blamed the Emissions Trading Scheme for price rises which will add an average $5 a month to electricity bills.

Mercury Energy blames the Emissions Trading Scheme for its planned increase in prices from July.