24 December 2025 
 
Ref: DOIA-REQ-0007023 / DOIA-REQ-0007052 
 
 
Jacob Xie 
Email: [FYI request #29383 email] 
            fyi‐request‐29382‐[email address] 
 
 
Tēnā koe Jacob Xie 
 
Thank you for your emails of 29 November and 2 December 2024 to the Ministry of Business, Innovation 
and Employment (MBIE) requesting, under the Official Information Act 1982 (the Act), the following 
information: 
  DOIA-REQ-0007023 
I am requesting the Commerical Report(s) done by Sapere regarding the Lake Onslow project 
 
DOIA-REQ-0007052 
I am requesting under the Official Information Act, any models, reports or relevant that lead up to 
the proposed storage capacity of Lake Onslow. I am happy for it to be in the form of a zip folder. 
 
The documents pertaining to the information you have requested in both requests have been published 
on MBIE’s website. I have provided the links to each relevant document that contains the information 
sought in the table below. 
 
Title 
Link to document 
DOIA-REQ-0007023 
NZ Battery – Electricity Market Study: Problem 2 – 
https://www.mbie.govt.nz/dmsdocument/28352-
Market Interaction 
nz-battery-problem-2-market-interaction 
DOIA-REQ-0007052 
Concept Consulting, JC, Estimated gross benefits of  https://www.mbie.govt.nz/dmsdocument/28336-
NZ Battery options, 21 May 2021 
estimated-gross-benefits-of-nz-battery-options-
may-2021 
NIWA, Identifying potential sites for large-scale 
https://www.mbie.govt.nz/dmsdocument/28349-
Pumped Hydroelectric Energy Storage (PHES) in 
identifying-potential-sites-for-large-scale-
New Zealand, September 2021 
pumped-hydroelectric-energy-storage-phes-in-
new-zealand-september-2021 
John Culy Consulting, Estimated gross benefits of 
https://www.mbie.govt.nz/dmsdocument/28337-
NZ Battery options, 30 November 2022 
estimating-the-gross-benefits-of-nz-battery-
options-november-2022 
Concept Consulting, JC, Estimated gross benefits of  https://www.mbie.govt.nz/dmsdocument/28338-
NZ Battery options: Modelling Appendix, 30 
nz-battery-gross-benefit-appendix-november-
November 2022 
2022 

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NZ Battery economic modelling assumptions 
https://www.mbie.govt.nz/dmsdocument/28347-
nz-battery-economic-modelling-assumptions-
book 
 
Sapere, NZ Battery – electricity market study, 3 
https://www.mbie.govt.nz/dmsdocument/28352-
May 2021 
nz-battery-problem-2-market-interaction 
Transpower, NZ Battery Analysis Input Summary, 
https://www.mbie.govt.nz/dmsdocument/28354-
March 2023 
nz-battery-analysis-input-summary-march-2023 
NZ Battery - OptGen/SDDP Market Modelling 
https://www.mbie.govt.nz/dmsdocument/28346-
Report, January 2023 
nz-battery-optgensddp-market-modelling-report-
january-2023 
 
MBIE is therefore refusing your request under section 18(d) of the Act, as the information requested is 
publicly available. 
 
If you wish to discuss any aspect of your request or this response, or if you require any further assistance, 
please contact [email address]. 
 
You have the right to seek an investigation and review by the Ombudsman of this decision. Information 
about how to make a complaint is available at www.ombudsman.parliament.nz or freephone 0800 802 
602. 
 
 
Nāku noa, nā 
 
 
 
 
Tamara Linnhoff 
Manager Electricity Generation, Infrastructure and Markets Policy 
Energy Markets 
 
 

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