More than half a billion dollars has been wiped off the value of NZX-listed electricity firms today.

Next Wednesday all eyes will be on the owners of the Tiwai Pt aluminium smelter to see if they give Meridian Energy notice they wish to terminate their contract.

Aucklanders are being warned they could face fines of up to $10,000 and daily penalties for not keeping their trees and other vegetation away from power lines.

Northland electricity lines companies have slammed the Electricity Authority for its proposal to grant an annual increase of nearly $300 in power charges per household.

Mighty River Power has defended its pre-paid energy service Globug, after it was criticised by an unhappy customer in the Otago Daily Times.

Auckland households could face an increase of 4.5 per cent in their power bills under changes the Electricity Authority is considering.

Despite speculation about its future in NZ, Origin Energy says it's committed to its investment in Contact Energy.

Electricity retailer Utilise is entering a "very tough market" with a lot of competition, according to Forsyth Barr analyst Andrew Harvey-Green.

Powerco, the energy lines company, reported a 20 per cent drop in annual profit as it paid more tax.

An experienced power line worker was last night fighting for his life after being flung from a live transformer in Auckland.

Taking long showers and leaving the lights on are among the big reasons flatmates argue when it comes to electricity usage, says Canstar Blue in a new survey.

An estimated two-thirds of New Zealand homes do not meet global guidelines for healthy living.

A top US Government official visiting the country has praised New Zealand as a “great model” for other countries working to boost their renewable energy generation.

A massive electrical storm has left some Mt Eden and Balmoral residents and businesses without power this afternoon.

Power companies have successfully pushed back against a move to provide people with more information about why prices go up.

Wellington company Flick describes itself as "the first retailer to give NZers access to the wholesale price of power direct from the market the big guys buy electricity from".

Tesla Motors' new stationary-storage unit making battery packs will help founder Elon Musk expand beyond electric vehicles.

Expect a little bit of love from your power company this year but they're not betting on it being requited.

Electricity demand is edging up but strong competition is keeping a lid on prices and could push them down this year.

The electricity sector has attracted a lot of attention in the past couple of weeks, both in the business pages and within the investment community itself.

Kiwi energy company Powershop is expanding its Australian market before targeting Europe and Asia next year.

Vector, the Auckland gas and electricity distribution monopoly, is in discussions with the Commerce Commission.