Fairfax Media has posted a loss of A$2.73 billion for 2011/12, driven by massive writedowns on the value of its newspapers.

Full year profits at our biggest listed energy company are up 27 per cent.

Rio Tinto's attempt to renegotiate New Zealand's largest electricity contract, for its aluminium smelter at Bluff, comes as the company's chief executive warns of "difficult decisions" ahead.

Australia's resource boom affecting exchange rate for other exporters.