31 Oct 2023
Type
Under the Electricity Industry Participation Code, Transpower is required to demonstrate a net benefit for any temporary or permanent reconfiguration of the grid.
| Project | Grid reconfiguration details | Documentation | Assessment |
|---|---|---|---|
| Eastern Bay of Plenty reconfiguration notice | We plan to reconfigure the grid in the Eastern Bay of Plenty region by permanently opening the 110 kV Edgecumbe-Kawerau 1 & 2 circuits and closing the 200/110 kV Edgecumbe T5 interconnecting transformer. The proposed reconfiguration will shift power flow from our 110 kV circuits to 220 kV circuits. | Supporting information | February 2025 |
| Bombay-Hamilton 110 kV transmission lines | The purpose of this document is to inform stakeholders of our intention to permanently disconnect the Bombay-Hamilton line from the grid and not invest in maintenance remediations to keep the line in service. The ability to disconnect these lines and reconfigure the grid has been enabled by our investment in new interconnecting transformers at Bombay. | Supporting Information | November 2023 |
| Studholme 110 kV split | The purpose of this document is to inform stakeholders of our intention to reconfigure the 110 kV network, by introducing a permanent summer split 1 at Studholme to manage loading |  Supporting information[ pdf 367.96 KB ] | October 2022 |
| North Taranaki Reconfiguration Notice | This document outlines the net benefit assessment for the reconfiguration of our network into New Plymouth and Carrington St substations. | Supporting information[ pdf 52.54 KB ] | November 2020 |
| Studholme 110 kV split | This document informs stakeholders of our intention to reconfigure the 110 kV network by introducing a conditional summer split at Studholme to manage loading on related circuits. | Supporting information[ pdf 418.81 KB ] | November 2020 |
| Otahuhu 110 kV bus | With the retirement of generation and the installation of new equipment, the impact of faults on the network has reduced, meaning that the bus split previously in place between the two 110 kV electrical buses at Otahuhu substation is no longer required. | Supporting information [ pdf 169.82 KB ] | May 2020 |
| Bells Pond transmission constraint - contingency plan | This document informs stakeholders of our intention to reconfigure the Lower Waitaki Valley 110 kV network, by introducing a system split at Studholme, in the event that:
| Supporting information [ pdf 643.75 KB ] | October 2016 |
| Arapuni Bus Split Retention | This document presents analysis supporting our intention to:
| Supporting information [ pdf 448.75 KB ] | June 2016 |
| Arapuni Bus Split Closure | Update to proposal to close the bus split at Arapuni - deferral of permanent closure until 2017. | Supporting information [ pdf 122.02 KB ] | March 2015 |
| Arapuni Bus Split Closure | We are proposing to close the bus split at Arapuni as there is a net benefit in doing so. A teleconference will be held to go over the proposal. Confirm your interest by email | Supporting information [ pdf 123.68 KB ] | November 2014 |
| Paraparaumu 220 kV Project | We have undertaken a net benefit test for reconfiguring the grid at Paraparaumu such that this facility becomes connected to Transpower's 220 kV lines allowing for the removal of the 23 km of 110 kv transmission line between Paraparaumu and Pauatahanui substations | Supporting information [ pdf 215.87 KB ] | September 2013 |
| Arapuni Bus Split Opening | We have reviewed the Net Benefit Test for continuing the Arapuni grid reconfiguration following a spare transformer for T1 at Arapuni being brought into service. There is a net benefit in splitting the Arapuni bus. We will open the Arapuni bus split from 25 June 2013 13:00 until further notice | Supporting information [ pdf 17.39 KB ] | June 2013 |
| Arapuni Bus Split Closure | We have reviewed the Net Benefit Test for continuing the Arapuni grid reconfiguration following the outage of transformer T1 at Arapunui. There is no net benefit in splitting the Arapuni bus while T1 is out of service. We will close the Arapuni bus from 28 May 2013 16:30 until further notice | Supporting information [ pdf 179.66 KB ] | May 2013 |
| Arapuni Bus Split Continuation | Transpower has undertaken a net benefit test to assess the continuation of the Arapuni Bus Split until commissioning of the Wairakei–Whakamaru C line and replacement Tarukenga interconnecting transformers. | October 2012 | |
| Mangamaire Bus Split Opening | Transpower proposes to open the bus split at Mangamaire for 6 weeks from 30 June 2012. | Supporting information [ pdf 772.08 KB ] | June 2012 |
| Mangamaire Bus Split Opening | Transpower proposes to open the bus split at Mangamaire between the dates of 11 May and 30 June 2012. | Supporting information [ pdf 356.08 KB ] | May 2012 |
| Arapuni Grid Reconfiguration | Transpower has implemented a system split at Arapuni between 6:00 and 21:00 on weekdays. The system split is a permanent change in the way the grid is configured and is effective from 29 September 2011. | Supporting information [ pdf 240.56 KB ] | September 2011 |
| Studholme-Timaru Split Closure | Transpower is closing the operational split between Studholme and Timaru annually between October and April effective from 28 January 2010. This is to reduce loss of supply to NZ Dairies Limited plant at Studholme during an outage of the main circuit supplying from the south. | Supporting information [ pdf 94.77 KB ] | January 2010 |
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Approach and assumptions for undertaking cost/benefit analysis