Trustpower may now have to pay nearly $15 million in tax and interest after losing a Supreme Court appeal.

Tesla may well stumble because it is trying to do too much too fast, but Musk's vision is sound.

Z Energy is moving away from supermarket docket discounts to instant savings for Fly Buys members.

Consumer prices rose less than expected in the June quarter as cheaper meat and domestic airfares offset a recovery in petrol prices

Combining solar panels and batteries would make homes fully self sufficient, but Powerwalls don't provide capacity to make it affordable.

The oil industry is fighting a generation gap.

COMMENT: The number of New Zealand households generating their own electricity from the sun climbed 77 per cent.

Switching power companies has hit a record and new figures show Kiwis could be better off if they change suppliers.

The New Zealand division of British Petroleum more than tripled net profit in 2015.

Helen Twose talks to three winners of this year's EECA Awards for energy efficiency.

Prices have been moving up recently and they augur higher prices at the pump for consumers.

King Country Energy has warned the Electricity Authority's planned overhaul of grid charges will increase prices.

Z Energy is confident of the savings it can make from the $785m acquisition of Chevron's Caltex and Challenge! chains.

Homes in west Auckland are without power after a car hit a transformer.

Energy Minister Simon Bridges says the abundance of renewable electricity has made New Zealand complacent about energy productivity.

Z Energy is about to open the country's first commercial scale biofuels plant in a bid to become part of the emissions solution.

A trust that helps sport to spread the energy saving message has won the top honours at the EECA Awards.

Entrants in the EECA energy awards saved or generated the equivalent of the annual energy use in New Plymouth during the past year.

COMMENT: The Royal Society has called for urgent action in NZ on carbon emissions. But the transition to renewable energy won't be quick or easy.

The company said earnings had been impacted by the settlement of its dispute with Customs.

The former state owned enterprise will soon be known as Mercury.

COMMENT: If we have the natural resources like wind, rain, sun and underground heat that can produce renewable electricity, we should harness it in the best way possible, writes Sam Judd.

New Zealand shares fell as demand dried up ahead of a Reserve Bank update, with Meridian Energy and Vector hit hardest.

After 22 years of producing clean electricity, New Zealand's first wind turbine is getting an upgrade today by owners Meridian Energy, writes Sam Judd.

New Zealand shares were mixed. The NZX 50 Index reached a record high but more companies fell.

Z Energy will get back $9.5 million of the amount it paid last year to settle a dispute with New Zealand Customs.