2025 Ancillary Services Tender
Closing date for tender responses is 5pm on Wednesday 5 November 2025.
The System Operator invites tenders for the provision of the following Ancillary Services for the period from 1 January 2026 to 31 December 2027:
- Instantaneous Reserve: two-year term only
- Back-up Single Frequency Keeping: two-year term only
- Multiple Frequency Keeping: two-year term only
- Black Start (North Island): two-year term only
Key Dates:
- Tender opens: Thursday 9 October 2025
- Tender briefing webinar: 10:30am Tuesday 21 October 2025
- Tender responses due: 5pm Wednesday 5 November 2025
Tender briefing:
There will be a tender briefing via Teams on Tuesday 21 October for any interested parties where we will provide an overview of the tender requirements and process. There will also be the opportunity to ask questions about the information and documents provided and the tender process.
Register your interest by email to [email protected]
Invitation to Tender
- Invitation and terms and conditions
- Tender response templates
- Draft Ancillary Services contract and schedules
- Other information
Ancillary Services Procurement Plan (located on the Electricity Authority's website)
Tender Response
Please prepare your tender response in electronic format (in Microsoft Word and PDF), using the templates above.
Tenders should be emailed to [email protected] by 5pm on the closing date listed above. Please include the phrase “Ancillary Service Tender Response” in the email subject line.
All submitted responses will be acknowledged by reply Email. Note that information provided to Transpower is subject to the Official Information Act 1982.
If you have any questions about the tender, you can contact the tender co-ordinator, Bridget Legg, on 021 718 404 or by email at [email protected].