Meridian Energy's announcement that it had been approached by New Zealand's biggest power user, Rio Tinto, to discuss potential changes to its supply contract has created uncertainty for the Government's plans to partly privatise the three power generators, analysts said.
State-owned South Island power generator Meridian said it had been approached by Pacific Aluminium, a business unit of Rio Tinto, the majority shareholder of New Zealand Aluminium Smelters (NZAS), to discuss potential changes to the electricity contract with the smelter.
The statement comes a time when Rio Tinto is assessing its options for the NZAS smelter at Tiwai Pt.
Tiwai takes about 15 per cent of New Zealand's electricity, so the prospect of changes to the contract between Meridian and Rio was enough to send Contact Energy's share price down 20c to $4.80 on Thursday.
Few in the financial markets expect Tiwai Pt to close, but if it did, much more power would be added to the national grid, depressing prices and affecting the profitability of all the power generators.