Kiwis keen to shape up for summer are spending up to $99 a day on detox programmes, but experts warn there is little evidence they work.

Vector has opened a big Tesla battery storage bank in Auckland which it says will help defer costly building of less flexible infrastructure.

The Electricity Authority is to undertake another round of submissions on its politically charged proposals.

Norway's Statoil has abandoned its hunt for oil off Northland after finding no traces hydrocarbons.

Contact Energy's near-term focus was reducing debt, to ensure it maintains its investment grade status from credit rating agency Standard & Poor's.

COMMENT: Accountant's focus is now on electricity customers.

The widely succesful Tesla Model 3 will soon be available to New Zealand customers with a retail site in the works for next year.

Infratil and the New Zealand Superannuation Fund have teamed up to invest in US renewable energy development company Longroad Energy Holdings.

Power company Mercury is converting a former gas generation site into a solar panel and battery research centre.

Many of us are notorious for eating lots and ditching all our self-imposed diet and exercise rules on the weekends.

Wall Street dropped with the price of oil after reports from OPEC and IEA showed the global glut won't abate any time soon.

COMMENT: The science is clear: we must rapidly transition from fossil fuel energy. But industry won't let this happen without a fight.

Oil jumped before giving up some of the gains as a deal between key producers Saudia Arabia and Russia stopped short of offering an actual limit on output.

Falling demand - not an oil shortage - will create the energy industry's next revolution.

The cash-poor state can do only so much to shore up its sinking coasts.

Meridian Energy is declaring a special dividend for shareholders in a sector where strong cashflows are not currently required for new investment.

Mercury, formerly known as Mighty River Power, has delivered a 2.3 percent lift in operating earnings and declared a special dividend.

US federal plan to preserve habitats and accommodate industry makes few happy.

Auckland-based Mercury has swapped its Roman god logo for a bee.

Efficiency moves by industry deliver financial savings.

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.