We consulted on amending the extended reserve Code obligations in order to help deliver a more flexible and resilient electricity system.
This consultation led to an amendment to the Code to enable the transition of the automatic under-frequency load shedding (AUFLS) provision in the North Island to the system operator’s proposed 4-block scheme. It also made explicit the testing requirements for the AUFLS systems.
The proposal required North Island distributors to proactively engage with the system operator to transition their AUFLS systems to the 4-block scheme no later than June 2025. It also re-stated the AUFLS relay testing requirements removed from the Code in the 2016 Extended reserve Code amendment.
There was no change to the South Island AUFLS scheme or responsibility for provision proposed or implemented.
Consultation paper - Extended reserves Code amendment12 April 2021
Appendix A - System operator status letter12 April 2021
Appendix D - EY Cost-benefit analysis12 April 2021
Decision paper - Extended reserves Code amendment17 August 2021