So Helen Clark's Labour government set up the Electricity Commission
"... following extremely dry hydro years in 2001 and 2003, which led to government concerns that the electricity market did not provide adequate security of electricity supply."
https://en.wikipedia.org/wiki/Electricity_Commission_(New_Zealand)
It was intended to oversee the reliability of electricity supply in Aotearoa over the long term. Exactly what Vector is pointing out we don't have. Why?