An investigation into the substation fire which cut power to tens of thousands of Aucklanders will be jointly carried out by Transpower and Vector.

Vector and Transpower will audit vital equipment at power substations in a bid to identify other potentially vulnerable or problem areas within Auckland's beleaguered electricity network.

Energy Minister Simon Bridges says he is confident that lines company Vector acted appropriately in the wake of the power cuts in Auckland.

Vector has warned recently restored power users to expect to be 'dropped' from the system during peak times today, as a former chairman criticises the company.

Power should be restored to all Auckland suburbs by 5am tomorrow, lines company Vector said.

A former Mighty River Power engineer accused of $2 million fraud at the company has pleaded not guilty this morning.

Oil and gas explorers gathering in Auckland next week are breathing a sigh of relief at the election result but face the age-old challenge - making a major discovery.

For nearly a year, it turns out, the Pike River mine could have been made safe to enter.

Kathmandu, which today posted a 4.5pc decline in annual profit, said Australasian earnings should rise in the coming year.

Investors in Genesis Energy, Mighty River Power and Meridian Energy were more than $600 million richer on paper at one point yesterday after their shares were boosted by National's decisive victory.

Shares in Mighty River Power have finally rallied over their issue price after trading substantially below it for most of the company’s life.

Since 2002 our electricity market has brought us price rises of 46 per cent above inflation. Why?

Saudi Arabia will need to keep cutting oil output to sustain prices above $100 a barrel as global oil demand weakens, analysts say.

New Zealand financial markets are expected to firm when they open today after the National Party secured the first ever outright win.

Michelle Dickinson says the field of nanotechnology is going to experience huge growth in the coming years, and will affect most areas of our lives.

A couple charged with defrauding Mighty River Power of $2 million bought a $1.4 million Auckland property the month before the energy company started an investigation.

NZX-listed Mighty River Power has been caught up in an alleged $2 million employee husband-and-wife fraud.

Power bills have been rising relentlessly. The two sides of politics are divided on house best to rein that in - competition or regulation.

Vector has won a High Court fight with Inland Revenue and says is now entitled to a $7.6 million tax refund.

Vector saw net profit after tax fall 16.9pc in the year to June 30 as regulator-mandated cuts to its monopoly assets bit into revenues.

Cost savings have helped Mighty River Power boost profit by 84 per cent and pay a dividend slightly above expectations.