Lobby groups say gentailer incumbents have little commercial incentive to build new generation. (Image: Getty)The Auckland Business Chamber and Northern Infrastructure Forum are calling for the operational separation of New Zealand’s four major gentailers and a Crown-backed contracting scheme to accelerate investment in new electricity generation.In a report released by the two groups on Tuesday morning, Unleashing New Zealand Power, the groups argue the current market rewards scarcity because the gentailers control about 85% of generation and 95% of firming capacity.They say this gives incumbents little commercial incentive to build enough new g...