The planned closure of Tiwai Point Aluminium smelter presents a huge opportunity - according to Russel Norman from Greenpeace. But maximising that could cost the government a billion dollars - and initially thousands of jobs. The Manapouri hydro power station feeds the smelter that gobbles up about 13% of the country's power supply and the company's already given notice it's quitting that power contract. Greenpeace Executive Director Russel Norman says the news isn't all bad.