Figures show demand for electricity has been weak during the past year and there are few prospects of an increase.
Electricity Authority statistics show two-year contracts for wholesale power are down 26 per cent on current prices.
The fall results from softening industrial demand for electricity following the drop of production at the Tiwai Pt aluminium smelter and the closure of part of Norske Skogg's Kawerau pulp and paper mill. There is also weak residential and commercial demand for power.
The looming job cuts at Contact follow this month's announcements 192 jobs at Summit Wool Spinners in Oamaru will be lost and about 200 workers at Mainzeal will be laid off in the wake of the construction firm's receivership.