New Zealand changes battery rules and examines firming incentives
Summary
New Zealand's Electricity Authority announced phased battery trading changes and opened discussion on incentives for reliable backup supply [7, 9]. A separate funding amendment for financial transmission rights addresses locational price risk, with implementation scheduled after the battery rules' initial phase [7, 8].
Key developments
- Battery charging will become dispatchable from 30 October 2026, according to the Electricity Authority's announcement released 29 September 2026 [7]. An interim arrangement will also permit quantity updates after gate closure when expected capability changes, while trade prices remain fixed [7]. The Authority schedules the later state-of-charge and combined bid-and-offer arrangements for 31 March 2028 (Electricity Authority, released 29 September 2026, [7]). Separating these phases matters when assessing which operational changes are imminent.
- The Authority announced that all loss and constraint excess will be available to settle the financial transmission rights market, removing the existing allocation calculation [8]. It attributes the change to simpler funding arrangements and lower capital costs for adding hubs [8]. The effective date is 1 October 2027 (Electricity Authority, released 1 October 2026, [8]). Any change in hub availability or realized costs would need to be assessed after implementation.
- An issues and options paper asks whether market changes could support long-duration backup supply when renewable output is insufficient [9]. The Authority identifies less frequent running as a challenge for investment in backup generation and seeks feedback on possible responses [9]. Submissions close on 13 November 2026 (Electricity Authority, released 1 October 2026, [9]). The paper leaves the choice of measures open while feedback is being collected [9].
Prices and data
| Generation measure | Share | Observation period | Publisher and release |
|---|---|---|---|
| Grid connected solar | 2.7% of total generation | 20 to 26 September 2026 | Electricity Authority 29 September 2026 [10] |
| Wind | 11.5% of total generation | 20 to 26 September 2026 | Electricity Authority 29 September 2026 [10] |
| Thermal | 1.4% of total generation | 20 to 26 September 2026 | Electricity Authority 29 September 2026 [10] |
These reported generation shares provide earlier operational context, with a three-day release lag. The percentages describe electricity generated during the reporting week; installed capacity and subsequent output require separate observations [10].
What to watch next week
- We are monitoring preparation for the charging dispatch changes. Further implementation information could clarify how operators will manage the interim quantity updates before the later software arrangements take effect [7].
- We are monitoring the firming consultation for further evidence on backup supply and contracting. The Authority's earlier trading report describes batteries charging during lower demand and discharging at peaks; that pattern could inform discussion without establishing future reliability [9, 10].
Sources
[7] Electricity Authority. Authority changes rules to boost battery flexibility. Released 29 September 2026. Decision announced 29 September; phases scheduled for 30 October 2026 and 31 March 2028. Accessed 5 October 2026. Primary source
[8] Electricity Authority. Code changes support potential FTR market development. Released 1 October 2026. Decision announced 1 October 2026; effective date 1 October 2027. Accessed 5 October 2026. Primary source
[9] Electricity Authority. Feedback sought on improving incentives for long duration firming. Released 1 October 2026. Paper announced 1 October; feedback closes 13 November 2026. Accessed 5 October 2026. Primary source
[10] Electricity Authority. Trading conduct report 20 to 26 September 2026. Released 29 September 2026. Observations for 20 to 26 September 2026. Accessed 5 October 2026. Primary source
Original AFI prose adapted from Electricity Authority material, copyright Electricity Authority on behalf of the Crown. Selected Authority material is available under CC BY 4.0. Wording and presentation have been changed. No endorsement is implied.
This commentary is provided for general information only and is not investment, financial, legal or tax advice. It is not an offer or solicitation to buy or sell any security or other investment. Statements about possible future developments reflect assumptions and uncertainty; actual outcomes may differ. Information and views are dated as stated and may change without notice.