Poorly, judging by the situation in early 2018 when lake levels fell to historic lows. As I recall they started the coal units at Huntley but spot prices still went wild. Luckily we where bailed out by early rain. The government made some noises at the time but basically did nothing which might be construed as constructive or useful.

Fundamentally New Zealands infrastructure resilience model is based on the popular childrens game Jenga.