Investors will be looking for certainty from the state-owned power company's IPO. The hot issues:

Bluff smelter owners issued a swift contradiction to today's claim by its supplier, Meridian Energy, of an impasse over contract negotiations.

Generator says the proposal is uneconomic in the current flat electricity market.

Sale being considered to book gains made available by the global drop in interest rates.

Rio's has asked for changes to 18-year contracts for power supply that kick in on January 1.

State-owned generator won’t accept uncommercial terms for electricity to keep the Rio Tinto-controlled Tiwai Pt aluminium smelter open.