It is not uncommon for Transpower to issue requests for generators to bring on more generation to meet demand, but it is unusual for an emergency notice to be issued. But let me be clear, regardless of the mechanisms of the electricity market, New Zealanders rightly expect the lights to be on and the heaters to be running on a cold winter's night. That's why the situation that unfolded yesterday was unacceptable. If we're going to have a market-orientated system providing security of supply, then that market must deliver. The market failed in this respect.