Investors wanting more certainty around Labour-Greens policy for overhauling the electricity sector before the election appear to be out of luck.

Mighty River Power remains on track to meet forecast full-year profit for the year but is wary of falling lake levels feeding its central North Island hydro dams.

New Zealanders are switching to cheaper power companies in droves with help from Government-sponsored campaign.

The biggest barrier to new products is the complexity of 29 separate monopolies owning the country's electricity networks, says Contact.

International mining giant Rio Tinto said the outlook for the metal was positive despite a 9 per cent fall in spot prices over 2013.

The Government will loan households up to $15,000 at low interest rates to help them install solar power if the Greens are elected.

Today's generators never paid enough for the assets to entitle them to charge consumers what the authority now says is reasonable, writes Geoff Bertram.

Meridian Energy sold more electricity in the first six months of the current financial year than in the previous year, but prices achieved were significantly lower.

A Labour-led government will make good on its promise to regulate the electricity industry and stamp out 'super-profits', deputy leader David Parker says.

Consumer NZ says power prices for Kiwi households should fall after years of relentless increases including a 3% annual rise revealed in the latest official data.

The Govt has revised the estimate of how much it expects to receive from its partial asset sales down to between $4.6 to $5b.

NZ lighting technology has saved the Countdown supermarket chain's owner almost $500,000 a year in energy costs in two of its buildings.

Investors who took up shares in newly listed Mighty River Power and Meridian will take little comfort from PwC's latest report on the electricity sector.

The Government, fresh from the sale of shares in Mighty River Power and Meridian Energy, faces a harder sell when it comes to divesting a 49 per cent stake in the third and final power generator.

Hundreds of thousands of Transpower customers lost power today when backup measures failed to kick in while the company simulated a "catastrophic power failure".

Meridian Energy's instalment receipts have continued to hold firm, helped by buying interest from Bank of New York Mellon Corp, through its London-based subsidiary, Newton Investment.

A plan to produce power for 250,000 homes from tidal turbines in Kaipara Harbour, north of Auckland, has been put on hold.

Consumers shelling out as much as $30 for an LED lightbulb are being caught out by a lack of regulation.

A man died in the Far North after he climbed a power pole and touched wires connected to a 11,000 volt transformer following a fight with his girlfriend.

Farmers Jan and Barry Inwood put a dozen beers under their damaged power lines after a fierce storm left them in the dark.

Transpower has appointed chemical company executive Alison Andrew to replace chief executive Patrick Strange.