Clutha and Upper Waitaki Lines Project Operational Information

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The system operator will use this webpage to publish updates or information related to the Clutha Upper Waitaki Lines Project (CUWLP).

Outage Information

Transpower, as grid owner, has notified outages of the following circuits for the project:

  • NSY_ROX_1 and LIV_NSY_1 circuits POCP link 

​These outages can be viewed on POCP.  Any changes to these outages will be communicated via POCP and the usual notification processes.

Industry Briefings and Presentations

Recent Updates

13 September 2021

The system operator has published analysis of the power flow limits following completion of the Clutha Upper Waitaki Lines Project (CUWLP). These are the approximate transfer limits and indicative constraints that will apply once the Naseby-Roxburgh and Naseby-Livingstone duplexing is complete. The analysis is based upon the post-CUWLP grid configuration, commissioned generation assets and load profile (including Tiwai load). The results of this analysis are available here [ pdf 203.16 KB ].

11 December 2020

The grid owner has successfully completed the tactical thermal upgrade of the Cromwell-Twizel sections of both CYD_CML_TWZ_1 and 2 circuits.

4 December 2020

The grid owner has completed the tactical thermal upgrade of the Cromwell-Twizel section of the CYD_CML_TWZ_1. The last component of the upgrade to circuit 2 is scheduled for completion during the outage next week.

5 November 2020

The system operator has published its decision on proposed temporary reduction to offload times during Clutha and Upper Waitaki Lines Project outages ( See CAN issued 5 Nov 2020 [  266.23 KB ])

16 October 2020

The system operator has completed the analysis of system frequency impacts for an islanding event during the CYD_CML_TWZ_1 and 2 circuit for thermal upgrades. A Permanent Manual Constraint has been published which will be used when a single contingency would lead to the separation of the Southland from the remainder of the grid. Refer to the CAN for more details

CAN New Permanent Manual Constraint for GZ14 Export [  256.59 KB ]

02 October 2020

The grid owner has changed the schedule for outages on CYD_CML_TWZ_1 and CYD_CML_TWZ_2 over the period 16 November to 11 December 2020.

  • The 16 to 20 and 23 to 27 November outages on CYD_CML_TWZ_2 will now run continuously from 16 to 27 November.
  • The 30 November to 04 December and 7 December to 11 December on CYD_CML_TWZ_1 will now run continuously from 30 November to 11 December.

The weekend outages allow for additional substation work and safer working.  If we are able to return the assets to service earlier, we will notify here and via POCP.

Project Progress

In December 2020, Transpower completed the work needed on the Cromwell to Twizel circuits of the Roxburgh to Twizel line.  Work continues on the Roxburgh to Livingstone section of the Islington–Roxburgh line.

 

Customer Advice Notices (CANs)

Date Title
13/9/2021 CAN Power Flow Limits - Clutha Upper Waitaki Lines Project (CUWLP) [  395.25 KB ]
18/03/2021 CAN Clutha and Upper Waitaki Lines Project (CUWLP): update and outage changes [  272.87 KB ]
21/12/2020 CAN New Permanent Manual Constraint for GZ14 Export [ pdf 256.18 KB ]
03/12/2020 CAN Industry Briefing on Clutha Upper Waitaki Lines Project [ pdf 171.65 KB ]
23/11/2020 CAN Temporary reduction to offload times during Clutha and Upper Waitaki Lines Project outages (Refer CAN Ref: 3700368592 05 November 2020 and CAN Ref: 3685077424 23 October 2020) [  253.76 KB ]
05/11/2020 CAN Decision on proposed temporary reduction to offload times during Clutha and Upper Waitaki Lines Project outages (Refer CAN 23 October 2020) [  266.23 KB ]
23/10/2020 CAN Feedback invited on proposed temporary reduction to offload times during Clutha and Upper Waitaki Lines Project outages [  192.55 KB ]
16/10/2020 CAN New Permanent Manual Constraint for GZ14 Export [  256.59 KB ]
15/09/2020 CAN Update on outages for Clutha and Upper Waitaki [ pdf 189.73 KB ]
09/09/2020 CAN Industry Briefing on Clutha Upper Waitaki Lines Project [ pdf 271.76 KB ]
28/08/2020 CAN Power Flow Limits - Clutha Upper Waitaki Lines Project (CUWLP) [ pdf 177.68 KB ]
18/08/2020 CAN Asset Capability - Clutha Upper Waitaki Lines Project (CUWLP) [  264.1 KB ]
12/08/2020 CAN Clutha Upper Waitaki Lines Project (CUWLP) Outages [  360.77 KB ]
06/08/2020 CAN Clutha Upper Waitaki Lines Project (CUWLP) Timing Update [  258.65 KB ]
28/07/2020 CAN Outages for Clutha and Upper Waitaki Lines Project enabling works [  177.09 KB ]
23/07/2020 CAN Clutha Upper Waitaki Lines Project Timing Under Review [  178.73 KB ]

10 min Offload Times

The system operator has considered the feedback and made a decision on proposed temporary reduction to offload times during Clutha and Upper Waitaki Lines Project outages (Refer CAN [  266.23 KB ]: 5 November 2020)

Analysis

The system operator has completed analysis of the power flow limits during and after the Clutha Upper Waitaki Lines Project (CUWLP). This identifies the approximate transfer limits and indicative constraints that will apply during and after the various stages of the CUWLP Project.  Power Flow Limits - Clutha Upper Waitaki Lines Project (CUWLP) link [ pdf 203.16 KB ].

Questions and Answers

A set of questions we have received from industry along with our responses is available on our CUWLP Q & A page.


Links to Additional Information

Clutha Upper Waitaki Lines Project page

NZGB website

POCP database

Videos that explain how to perform POCP searches and receive notifications of outage changes are available on our Transpower YouTube channel, under the playlist Planned Outage Co-ordination Process