Past amendments and clarifications for electricity input methodologies
These are the past decisions we have made related to the input methodologies (IMs) for electricity distribution businesses that sit outside of the regular IM Review cycle.
These cover both price-quality and information disclosure related amendments.
Some of these amendments also apply to Transpower and gas pipeline services. You can find further information on those IMs here:
Information related to the 2023 and 2016 IM reviews are here:
Consolidated versions
2026
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Final decision reasons paper – Amendment to the input methodologies for electricity distribution businesses (Accounting for shifted revenue) – 19 May 2026
( 963 KB, PDF )
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Electricity Distribution Services Input Methodologies (Accounting for shifted revenue) Amendment Determination 2026 – 19 May 2026
( 396 KB, PDF )
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Electricity Networks Aotearoa – Submission on IM amendment (Accounting for shifted revenue) draft decision – 5 December 2025
( 1.1 MB, PDF )
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Orion – Submission on IM amendment (Accounting for shifted revenue) draft decision – 5 December 2025
( 211 KB, PDF )
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Powerco – Submission on IM amendment (Accounting for shifted revenue) draft decision – 5 December 2025
( 445 KB, PDF )
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Unison Networks and Centralines – Submission on IM amendment (Accounting for shifted revenue) draft decision – 5 December 2025
( 134 KB, PDF )
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Wellington Electricity – Submission on IM amendment (Accounting for shifted revenue) draft decision – 3 December 2025
( 316 KB, PDF )
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[Draft] Electricity Distribution Services Input Methodologies (Accounting for shifted revenue) Amendment Determination 2026 – 4 November 2025
( 278 KB, PDF )
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Proposed amendment to the input methodologies for electricity distribution businesses (Accounting for shifted revenue) Draft decision reasons paper – 4 November 2025
( 752 KB, PDF )
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Notice of Intention – Potential amendments to input methodologies for electricity distribution services – 25 June 2025
( 153 KB, PDF )
2025
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[Final] Transpower Input Methodologies (Reopeners and Other Matters) Amendment Determination 2025
( 600 KB, PDF )
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[Final] Electricity Distribution Services Input Methodologies (Reopeners and Other Matters) Amendment Determination
( 1.6 MB, PDF )
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[Final] Reopener IMAs – Final decision and reasons paper – 27 March 2025
( 687 KB, PDF )
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ENA – Submission on IM amendments draft decision – 23 January 2025
( 1.1 MB, PDF )
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Notice of Intention – IM Amendments – Electricity Distribution Services, Gas Distribution Services, Gas Transmission Services and Transpower – 20 May 2024
( 165 KB, PDF )
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Amended Notice of Intention – Potential amendments to input methodologies for electricity distribution services – 11 September 2024
( 157 KB, PDF )
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Notice of Intention – Potential amendments to input methodologies for electricity distribution services – 2 July 2024
( 158 KB, PDF )
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Transpower – Cross submission on IM Amendments (Reopeners and other matters) – 12 February 2025
( 201 KB, PDF )
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Big Six – Cross-submission IM amendments (Reopener and other matters) – 12 February 2025
( 163 KB, PDF )
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Wellington Electricity – Submission on IM amendments draft decision – 23 January 2025
( 498 KB, PDF )
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Transpower – Submission on IM amendments draft decision – 23 January 2025
( 226 KB, PDF )
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Firstlight Network – Submission on IM Amendments draft decision– 23 January 2023
( 183 KB, PDF )
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Big Six – Submission on IM Amendments draft decision – 23 January 2025
( 344 KB, PDF )
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Draft decision reasons paper – Proposed amendments to input methodologies for EDBs and Transpower (Reopeners and other matters) – 12 December 2024
( 808 KB, PDF )
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[Draft] Transpower Input Methodologies (Reopeners and other matters) Amendment Determination 2025 – 12 December 2024
( 670 KB, PDF )
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[Draft] Transpower Individual Price-Quality Path Amendment Determination 2025 (No. 2) – 12 December 2024
( 147 KB, PDF )
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[Draft] Electricity Distribution Services Input Methodologies (Reopeners and Other Matters) Amendment Determination 2025 – 12 December 2024
( 1.8 MB, PDF )
2024
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[Final] Gas Transmission Services Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024
( 354 KB, PDF )
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[Final] Transpower Capital Expenditure Input Methodology (treatment of insurance entitlements) Amendment Determination 2024
( 299 KB, PDF )
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[Final] Transpower Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024
( 296 KB, PDF )
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[Final] Transpower RCP3 Individual Price-Quality Path (treatment of insurance entitlements) Amendment Determination 2024
( 185 KB, PDF )
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Final decision reasons paper – IM Amendments (treatment of insurance entitlements) – 11 December 2024
( 439 KB, PDF )
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[Final] Transpower RCP4 Individual Price-Quality Path (treatment of insurance entitlements) Amendment Determination 2024
( 182 KB, PDF )
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[Final] Electricity Distribution Services Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024
( 397 KB, PDF )
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[Final] Gas Distribution Services Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024
( 326 KB, PDF )
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[Draft] Gas Transmission Services Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024 – 3 September 2024
( 301 KB, PDF )
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Orion – Submission on draft IM Amendment (insurance entitlements) – 25 September 2024
( 186 KB, PDF )
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ENA – Submission on draft IM amendments (Insurance entitlements) – 3 October 2024
( 1.3 MB, PDF )
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Unison – Cross-submission on draft IM amendments (insurance entitlements) – 21 October 2024
( 235 KB, PDF )
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Notice of Intention – IM Amendments – Electricity Distribution Services, Gas Distribution Services, Gas Transmission Services and Transpower – 20 May 2024
( 165 KB, PDF )
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Draft Reasons paper – Proposed amendments to IMs for EDBs, GPBs and Transpower – 3 September 2024
( 467 KB, PDF )
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[Draft] Transpower Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024 – 3 September 2024
( 245 KB, PDF )
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ENA – Cross-submission on draft IM Amendments (insurance entitlements) – 21 October 2024
( 2 MB, PDF )
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[Draft] Gas Distribution Services Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024 – 3 September 2024
( 275 KB, PDF )
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Unison – Submission on draft IM amendments (insurance entitlements) – 4 October 2024
( 279 KB, PDF )
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Vector – Cross-submission on draft IM Amendments (insurance entitlements) – 21 October 2024
( 182 KB, PDF )
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[Draft] Electricity Distribution Services Input Methodologies (treatment of insurance entitlements) Amendment Determination 2024 – 3 September 2024
( 309 KB, PDF )
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[Draft] Transpower Individual Price-Quality Path (treatment of insurance entitlements) Amendment Determination 2024 – 3 September 2024
( 164 KB, PDF )
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Transpower – Submission on draft IM Amendments (insurance entitlements) – 1 October 2024
( 180 KB, PDF )
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[Final] EDB IM (Wash-up Amounts) Amendment Determination 2024 – 20 November 2024
( 251 KB, PDF )
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[Final] EDB IM Amendments (Wash-up Amounts) final decision reasons paper – 20 November 2024
( 294 KB, PDF )
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[Draft] EDB IM (Wash-up Amounts) Amendment Determination 2024
( 248 KB, PDF )
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Draft reasons paper – Proposed amendments to EDB IMs – Wash-up Amounts
( 290 KB, PDF )
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IM Amendment 2024 Wash-up Demonstration Model – 21 October 2024
( 237 KB, XLSX )
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Aurora – Submission on EDB IM Amendments (Wash-up Amounts) – 31 October 2024
( 134 KB, PDF )
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ENA – Submission on EDB IM Amendments (Wash-up Amounts) – 31 October 2024
( 1.1 MB, PDF )
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Orion – Submission on EDB IM Amendments (Wash-up Amounts) – 31 October 2024
( 193 KB, PDF )
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Vector – Submission on EDB IM Amendments (Wash-up Amounts) – 4 November 2024
( 164 KB, PDF )
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Wellington Electricity – Submission on EDB IM Amendments (Wash-up Amounts) – 31 October 2024
( 372 KB, PDF )
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Orion – Cross-submission on EDB IM amendments (Wash-up Amounts) – 13 November 2024
( 136 KB, PDF )
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Notice of Intention – Potential amendments to input methodologies for electricity distribution services – 2 July 2024
( 158 KB, PDF )
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Amended Notice of Intention – Potential amendments to input methodologies for electricity distribution services – 11 September 2024
( 157 KB, PDF )
2020
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Final decision – EDB IM amendment and DPP determination – correction to definition of discount – Reasons paper – 30 March 2020
( 339 KB, PDF )
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[Final] [2020] NZCC 2 – Electricity distribution services input methodologies amendments determination 2020 – 30 March 2020
( 196 KB, PDF )
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[Final] [2020] NZCC 3 – Electricity distribution services default price-quality path (Definition of discount) amendments determination 2020 – 30 March 2020
( 191 KB, PDF )
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Network Tasman – Submission on discount error correction draft decision – 12 March 2020
( 162 KB, PDF )
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Top Energy – Submission on discount error correction draft decision – 11 March 2020
( 336 KB, PDF )
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The Lines Company Limited – Submission on discount error correction draft decision – 12 March 2020
( 154 KB, PDF )
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Centralines – Submission on discount error correction draft decision – 12 March 2020
( 49 KB, PDF )
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ENA – Submission on discount error correction draft decision – 12 March 2020
( 153 KB, PDF )
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Draft decision – EDB IM amendment and DPP determination 2020 – Correction to definition of discount – draft amendment companion paper – 27 February 2020
( 333 KB, PDF )
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[DRAFT] Electricity distribution services input methodologies amendments determinations 2020 – 27 February 2020
( 191 KB, PDF )
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[DRAFT] Electricity distribution services default price-quality path (Definition of discount) amendments determination 2020 – 27 February 2020
( 184 KB, PDF )
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Notice of intention to consult on IM determination amendment – Discount error correction – 11 February 2020
( 179 KB, PDF )
2019
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[Final] [2019] NZCC 20 Electricity distribution services input methodologies amendments determination (No.2) 2019 – 26 November 2019
( 1.3 MB, PDF )
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Final decision – Amendments to EBDs IM determination reasons paper – 26 November 2019
( 855 KB, PDF )
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Transpower – Cross-submission on IM amendments for DPP and IPP – 19 July 2019
( 502 KB, PDF )
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Wellington Electricity – Cross-submission on IM amendments for DPP and IPP – 19 July 2019
( 213 KB, PDF )
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Orion – Cross-submission on IM amendments for DPP and IPP – 19 July 2019
( 460 KB, PDF )
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CEG on behalf of Vector – Submission on IM amendments for DPP and IPP – 5 July 2019
( 1.5 MB, PDF )
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ENA – Submission on IM amendments for DPP and IPP – 5 July 2019
( 212 KB, PDF )
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MEUG – Submission on IM amendments for DPP and IPP – 5 July 2019
( 149 KB, PDF )
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Transpower – Submission on IM amendments for DPP and IPP – 5 July 2019
( 588 KB, PDF )
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Vector – Submission on IM amendments for DPP and IPP – 5 July 2019
( 1.5 MB, PDF )
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Vector – Attachment A –Submission on IM amendments for DPP and IPP – 5 July 2019
( 100 KB, PDF )
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Unison – Submission on IM amendments for DPP and IPP – 8 July 2019
( 235 KB, PDF )
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[DRAFT] Electricity distribution services Input Methodologies amendments determination 2019 – 29 May 2019
( 1.6 MB, PDF )
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Draft decision – Proposed amendments to input methodologies for electricity distributors and Transpower New Zealand Limited – Reasons paper – 29 May 2019
( 438 KB, PDF )
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Notice of intention for potential amendments to IMs for EDBs and Transpower – 16 May 2019
( 217 KB, PDF )
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Notice of intention to consult on IM determination amendments – Limit on increase in forecast revenue from prices – 15 November 2018
( 495 KB, PDF )
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Response from the Commission to ENA’s letter on the WACC estimate and CPI forecasts for DPP3 – 17 October 2019
( 2.9 MB, PDF )
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Letter to the Commission from the ENA on the WACC estimate and CPI forecasts for DPP3 – 5 September 2019
( 211 KB, PDF )
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Letter to the Commission from Vector Energy on the WACC estimate for DPP3 and CPI forecasts – 6 November 2019
( 544 KB, PDF )
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Final decision – IM amendments for treatment of operating leases – Reasons paper – 13 November 2019
( 690 KB, PDF )
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[Final] [2019] NZCC 17 Transpower capital expenditure input methodology amendments determination (No. 2) 2019 – 13 November 2019
( 209 KB, PDF )
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[Final] [2019] NZCC 16 Transpower input methodologies amendments determination (No. 2) 2019 – 13 November 2019
( 215 KB, PDF )
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[Final] [2019] NZCC 18 Electricity distribution services input methodologies amendments determination 2019 – 13 November 2019
( 224 KB, PDF )
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Vector – Cross-submission on the treatment of operating leases draft decision – 2 October 2019
( 155 KB, PDF )
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Powerco – Cross-submission on the treatment of operating leases draft decision – 2 October 2019
( 118 KB, PDF )
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Vector – Submission on draft determinations for the treatment of operating leases draft decision – 2 October 2019
( 155 KB, PDF )
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Powerco – Submission on draft determinations for the treatment of operating leases draft decision – 2 October 2019
( 118 KB, PDF )
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Transpower – Submission on the treatment of operating leases issues paper – 10 July 2019
( 569 KB, PDF )
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Operating leases model – EDB version – 3 July 2019
( 299 KB, XLSX )
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Vector – Submission on the treatment of operating leases draft decision – 18 September 2019
( 130 KB, PDF )
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First Gas – Submsission on the treatment of operating leases issues paper – 10 July 2019
( 192 KB, PDF )
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Treatment of operating leases – Issues paper – 6 June 2019
( 344 KB, PDF )
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Transpower – Submission on draft determinations for the treatment of operating leases draft decision – 18 September 2019
( 1.2 MB, PDF )
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Operating leases model – Transpower version – 3 July 2019
( 258 KB, XLSX )
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ENA – Submission on the treatment of operating leases draft decision – 18 September 2019
( 308 KB, PDF )
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Operating Leases – Information Request Workbook – Transpower – 24 July 2019
( 855 KB, XLSX )
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Powerco – Submission on the treatment of operating leases draft decision – 18 September 2019
( 138 KB, PDF )
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Vector – Submission on the treatment of operating leases issues paper – 10 July 2019
( 756 KB, PDF )
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Powerco – Submission on the treatment of operating leases issues paper – 10 July 2019
( 137 KB, PDF )
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ENA – Submission on the treatment of operating leases issues paper – 10 July 2019
( 295 KB, PDF )
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Aurora Energy – Submission on the treatment of operating leases issues paper – 10 July 2019
( 143 KB, PDF )
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MEUG – Submission on the treatment of operating leases issues paper – 10 July 2019
( 165 KB, PDF )
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s53ZD(1)(e) notice to supply information to the Commerce Commission – Transpower operating leases – 19 July 2019
( 218 KB, PDF )
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s53ZD(1)(e) notice to supply information to the Commerce Commission – Non-exempt EDBs operating leases – 19 July 2019
( 214 KB, PDF )
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Operating Leases – Information Request Workbook – Non-exempt EDBs – 19 July 2019
( 857 KB, XLSX )
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Draft decision – IM amendment for treatment of operating leases – Reasons paper – 28 August 2019
( 1.1 MB, PDF )
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Transpower – Submission on the treatment of operating leases draft decision – 18 September 2019
( 1.2 MB, PDF )
2018
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[Final] Electricity distribution services input methodologies (accelerated depreciation) amendments determination 2018 – 8 November 2018
( 540 KB, PDF )
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Final decision – Amendments to electricity distribution services input methodologies determination in relation to accelerated depreciation – Reasons paper – 8 November 2018
( 696 KB, PDF )
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Orion – Submission on IM amendment for accelerated depreciation – 6 September 2018
( 445 KB, PDF )
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Vector – Submission on IM amendment for accelerated depreciation – 6 September 2018
( 58 KB, PDF )
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PwC – Submission on IM amendment for accelerated depreciation – 6 September 2018
( 165 KB, PDF )
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Draft decision – Proposed amendments to electricity distribution services input methodologies determination in relation to accelerated depreciation – Draft reasons paper – 23 August 2018
( 703 KB, PDF )
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[DRAFT] Electricity distribution services input methodologies amendments determination 2018 – 23 August 2018
( 374 KB, PDF )
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Notice of intention to consult on EDB IM determination amendments – 17 July 2018
( 478 KB, PDF )
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Notice of intention to consult on IM determination amendments – Limit on increase in forecast revenue from prices – 15 November 2018
( 495 KB, PDF )
2015
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Final reasons paper – Further amendments to IRIS for electricity distributors – 25 November 2015
( 684 KB, PDF )
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[Final] Further amendments to IRIS Opex scenarios – 25 November 2015
( 864 KB, XLSX )
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[Final] [2015] NZCC 32 Electricity distribution services (IRIS) input methodologies amendments determination 2015 – 25 November 2015
( 569 KB, PDF )
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Transpower – Submission on further amendments to IRIS for EDBs – 20 March 2015
( 870 KB, PDF )
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Transpower tests – Commerce Commission IRIS model
( 258 KB, XLSX )
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Opex Scenarios – IRIS amendments [Technical draft] – 27 February 2015
( 1.2 MB, XLSX )
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Draft electricity distribution IRIS input methodology amendments determination 2015 – 27 February 2015
( 567 KB, PDF )
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Draft decision – Further amendments to IRIS input methodologies for EDBs – 27 February 2015
( 553 KB, PDF )
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Vector – Submission on further amendments to IRIS for EDBs – 20 March 2015
( 189 KB, PDF )
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Transpower – Non-recurrent costs investigation scenarios – 2
( 24 KB, XLSX )
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Transpower – Non-recurrent costs investigation scenarios – 1
( 24 KB, XLSX )
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Transpower – Submission on further amendments to IRIS for EDBs – Frontier Report Symmetric IRIS – 20 March 2015
( 485 KB, PDF )
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PwC – Submission on further amendments to IRIS for EDBs – 20 March 2015
( 157 KB, PDF )
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Orion – Submission on further amendments to IRIS for EDBs – 20 March 2015
( 160 KB, PDF )
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Powerco – IRIS submission modelling appendix
( 542 KB, XLSX )
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Powerco – Submission on further amendments to IRIS for EDBs – 20 March 2015
( 408 KB, PDF )
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ENA – Submission on further amendments to IRIS for EDBs – 20 March 2015
( 611 KB, PDF )
2014
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Final reasons paper – Incremental rolling incentive scheme (IRIS) – 27 November 2014
( 613 KB, PDF )
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[Final] [2014] NZCC 32 Incremental Rolling Incentive Scheme input methodology amendments determination 2014 – 27 November 2014
( 6.4 MB, PDF )
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[Final] Opex scenarios for 5 year DPP – IRIS amendments – 28 November 2014
( 371 KB, XLSX )
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[Final] Opex scenarios for DPP less than 5 years – IRIS amendments – 28 November 2014
( 633 KB, XLSX )
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[Final] Capex scenarios for DPP – IRIS amendments – November 2014
( 370 KB, XLSX )
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[Final] Opex scenarios for 5 year IPP – IRIS amendments – November 2014
( 222 KB, XLSX )
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ENA submission on revised incremental rolling incentive scheme – 31 October 2014
( 454 KB, PDF )
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Orion submission on revised incremental rolling incentive scheme – 31 October 2014
( 331 KB, PDF )
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Powerco submission on revised incremental rolling incentive scheme – 31 October 2014
( 240 KB, PDF )
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Transpower submission on revised incremental rolling incentive scheme – 31 October 2014
( 380 KB, PDF )
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Unison submission on revised incremental rolling incentive scheme – 31 October 2014
( 102 KB, PDF )
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Vector submission on revised incremental rolling incentive scheme – 31 October 2014
( 110 KB, PDF )
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Final reasons paper – Electricity distribution input methodology amendments (Type 1 and 2) – 27 November 2014
( 573 KB, PDF )
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[Final] [2014] NZCC 31 Electricity distribution services input methodology amendments determination 2014 – 27 November 2014
( 3.8 MB, PDF )
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MEUG submission on proposed electricity distribution input methodology amendments 2014 – August 2014
( 77 KB, PDF )
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Electricity Authority submission on proposed electricity distribution input methodology amendments – August 2014
( 159 KB, PDF )
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Vector submission on proposed electricity distribution input methodology amendments 2014 – August 2014
( 182 KB, PDF )
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ENA – Submission on proposed amendments to input methodologies for electricity distribution services – 18 July 2014
( 784 KB, PDF )
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Powerco – Submission on proposed amendments to input methodologies for electricity distribution services – 7 July 2014
( 168 KB, PDF )
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Vector – Submission on proposed amendments to input methodologies for electricity distribution services – 14 July 2014
( 165 KB, PDF )
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Proposed electricity distribution input methodology amendments 2014 (second type)
( 351 KB, PDF )
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Draft decision – Proposed amendments to input methodologies for electricity distribution services – Consultation paper (second type) – 18 July 2014
( 540 KB, PDF )
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Draft decision – Proposed amendments to input methodologies for electricity distribution services – 24 June 2014
( 372 KB, PDF )
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Notice of Intention - Proposed amendments to input methodologies for EDBs – 29 April 2014
( 331 KB, PDF )
2012
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[Final] NZCC 34/2012 Electricity and gas input methodology determination amendments (No.2) 2012 CPP cash flow timing – 15 November 2012
( 376 KB, PDF )
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Final reasons for amendments to input methodologies CPP cash flow timing
( 602 KB, PDF )
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Draft methodologies and additional explanatory material for consultation on cash flow timing for CPP – 31 August 2012
( 468 KB, PDF )
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Consultation on amendments to input methodologies CPP cash flow timing – 10 August 2012
( 471 KB, PDF )
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ENA request for deadline extension – 6 September 2012
( 72 KB, PDF )
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Letter from Vector – 25 June 2012
( 196 KB, PDF )
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Letter to Vector – 12 September 2012
( 396 KB, PDF )
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Attachment to Vector's letter – 25 June 2012
( 203 KB, PDF )
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Final decision – Electricity and Gas Input Methodology Determination Amendments 2012 Reasons Paper
( 482 KB, PDF )
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NZCC 18/2012 Electricity and Gas Input Methodology determination amendments – 29 June 2012
( 5 MB, PDF )
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Aurora – Proposed amendments to electricity and gas IMs – 1 June 2012
( 126 KB, PDF )
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ENA – Proposed amendments to electricity and gas IMs – 1 June 2012
( 267 KB, PDF )
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GasNet – Proposed amendments to electricity and gas IMs – 1 June 2012
( 203 KB, PDF )
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InternetNZ – Proposed amendments to electricity and gas IMs – 1 June 2012
( 142 KB, PDF )
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Maui – Proposed amendments to electricity and gas IMs – 1 June 2012
( 101 KB, PDF )
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Orion – Proposed amendments to electricity and gas IMs – 1 June 2012
( 256 KB, PDF )
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PwC – Proposed amendments to electricity and gas IMs – 1 June 2012
( 173 KB, PDF )
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Powerco – Proposed amendments to electricity and gas IMs – 1 June 2012
( 150 KB, PDF )
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Unison – Proposed amendments to electricity and gas IMs – 1 June 2012
( 586 KB, PDF )
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Vector – Proposed amendments to electricity and gas IMs – 1 June 2012
( 199 KB, PDF )
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Draft decision – Consultation on electricity and gas input methodologies – 11 May 2012
( 656 KB, PDF )
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Notice of intention amendments to input methodologies – 19 April 2012
( 263 KB, PDF )
2011
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Notice of Intention - Process for determining additional input methodologies for electricity distribution services and gas pipeline services - 29 November 2011
( 257 KB, PDF )
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Commission email response to Vector query on controllable opex – 8 March 2011
( 1.2 MB, PDF )
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Commission Response to Unison Seeking Amendment to Drafting of Input Methodologies – 25 February 2011
( 217 KB, PDF )
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Unison Letter to Commission Seeking Amendment to Drafting of Input Methodologies – 24 January 2011
( 370 KB, PDF )
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Process for Amendments and Clarifications of Part 4 Determinations 8 March 2011
( 44 KB, PDF )
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Request for Clarification/Amendments to Part 4 Determinations Commission Responses 2011
( 89 KB, XLS )