Prices slashed for a second time this week with another tipped for tomorrow.

New Zealand-owned fuel company Z Energy has apologised to a small group of "Z Card" business customers for accidentally overcharging.

Fuel company Z says it has built New Zealand's first commercial-scale biodiesel plant, at Wiri, for $26 million.

Z Energy says committing to using biofuel is one way people can contribute to the global effort to reduce climate change outlined in the Paris Agreement.

Mike Bennetts has driven Z Energy since its inception and this year has been a particularly strong one for shareholders.

Drivers of electric vehicles will pay between $5-$10 to "fill up" at rapid-charge stations.

Greg Hall finds out how smart businesses are putting in place plans to reduce their power consumption

Infratil, the investment company managed by Wellington-based investment bank Morrison & Co, posted a 14 percent gain in first-half pretax earnings.

Infratil will book a profit of $392m on the sale of its remaining 20pc stake in Z Energy.

The S&P/NZX 50 Index fell 42.45 points, or 0.7 per cent, to 5654.34. Within the index, 35 stocks fell, eight rose and seven were unchanged. Turnover was $123 million.

Z Energy is warning it's facing a potential multi-million dollar bill from NZ Customs - backdated to 1986.

BP New Zealand generated its smallest earnings in more than a decade due to falling oil prices.

The Commerce Commission has indicated a timeframe on when it expects to make a decision the acquisition.

Z Energy, the listed service station chain, said its planned $785 million purchase of rival Chevron New Zealand's Caltex-branded network won't drive up prices at the pump because the target doesn't....

The boss of a Z Energy rival says its planned acquisition of Caltex operator Chevron NZ could impact competition in the fuel market.

The massive rally in Z Energy shares, sparked by the firm's plans to acquire a rival, should raise competition concerns for the Commerce Commission, says a market source.

The sale of Caltex is another example of the exodus of multi-national oil companies from the New Zealand market.

Z Energy posted a 10 per cent increase in full-year operating earnings, as fuel and refining margins improved and the service station chain sold more fuel.

A new report claims to have disproved a well established urban myth that petrol companies are quick to raise petrol prices, but slow to drop them when prices fall.

The sharp fall in oil prices is set to continue benefiting consumers but could delay exploration projects around New Zealand.

Mike Bennetts proved he was prepared to take a punt getting rid of the century-old Shell brand and renaming it Z Energy in 2011.

Martin Aircraft Company has extended its IPO for two weeks as the firm negotiates with a potential investor that could become a cornerstone shareholder.

Z Energy is the latest company to jump on the big data trend, doing a deal with analytics company 11 Ants Analytics to help the service station firm better understand customer preferences and buying....

Driving environmental sustainability at a petrol retailer seems counterintuitive at best; at worst, being on a hiding to nothing.

Z Energy reported a 13pc decline in first-half earnings after it made top-up payments to the Marsden oil refinery.

A company has been fined after associates of the firm traded shares of Z Energy and other companies during the holding period following IPO's.

Z Energy boss Mike Bennetts says the return of $2 a litre petrol could be on the cards if oil prices continue to plummet.

Z Energy plans to spend $21 million on a biodiesel plant in Auckland using fat from the meat industry.