The following table summarises the contracted providers for 2020/21:
| Ancillary Service Agent | MFK | Backup SFK |
IR | OFR | BS |
|---|---|---|---|---|---|
| Contact Energy | ♦ | ♦ | ♦ | ♦ | ♦ |
| Counties Power | ♦ | ||||
| EnerNOC | ♦ | ||||
| Genesis Energy | ♦ | ♦ | ♦ | ♦ | |
| King Country Energy | ♦ | ||||
| Mercury Energy | ♦ | ♦ | ♦ | ♦ | ♦ |
| Meridian Energy | ♦ | ♦ | ♦ | ♦ | ♦ |
| Nga Awa Purua (Mercury) | ♦ | ||||
| Norske Skog | ♦ | ||||
| Northpower | ♦ | ||||
| Trustpower | ♦ | ♦ | |||
| Tuaropaki (Mercury) | ♦ | ||||
| Vector | ♦ | ||||
| WEL Networks | ♦ | ||||
| Wellington Electricity Lines | ♦ |
