About 20,000 homes were left in the dark on Monday night, after Transpower asked providers to ease network demand.
Genesis Energy's Chief Executive claims the company's portfolio showed there was capacity to manage the demand.
Marc England says they couldn't fire up an extra generator by the time the risk was apparent.
But Transpower's Head of Grid Delivery John Clark says it issued the first notice at 6.00am.
He says during the day it was escalated to a warning notice, and then finally to a grid emergency around 5.00pm.
Bob Weir, former General Manager of Generation and Trading at Genesis Energy joined Kere McIvor.
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