Regulatory Investment Tests

TransGrid is required to undertake the Regulatory Investment Test for Transmission (RIT-T) for regulated revenue investments. 

From 18 September 2017, changes to the National Electricity Rules widened the scope of the RIT-T to include replacement projects. 

The purpose of the RIT-T, as set out at clause 5.16 of the National Electricity Rules, is to identify the credible option that maximises the present value of net economic benefit to all those who produce, consume and transport electricity in the market.

TransGrid is applying the RIT-T to the projects listed in the table below.

RIT-T
Status
Type
Reports
Consultation closing date
Maintaining compliance with performance standards applicable to Liverpool substation secondary systems
Consultation Open
Secondary Systems
Project Specification Consultation Report
19 January 2021
Maintaining compliance with performance standards applicable to Darlington Point substation secondary systems
Consultation Open
Secondary Systems
Project Specification Consultation Report
16 December 2020
Managing asset risks at Forbes substation
Consultation Open
Substation
Project Specification Consultation Report

Project Assessment Conclusions Report
Closed


4 January 2021
Improving stability in south-western NSW
PSCR Closed
Increase network stability limits
Project Specification Consultation Report
Closed
Maintaining compliance with performance standards applicable to Murrumburrah substation secondary systems
PSCR Closed
Secondary Systems
Project Specification Consultation Report
Closed
Managing safety and environmental risks on Line 17
PSCR Closed
Transmission line
Project Specification Consultation Report

Project Assessment Conclusions Report
Closed


4 January 2021
Meeting demand growth in the Greater Macarthur area
RIT-T Complete
Reliability
Project Specification Consultation Report

Project Assessment Conclusions Report
Closed


Closed
Maintaining compliance with performance standards applicable to Tuggerah substation secondary systems
RIT-T Complete
Secondary Systems
Project Specification Consultation Report

Project Assessment Conclusions Report
Closed


Closed
Maintaining compliance with performance standards applicable to Broken Hill substation secondary systems
PSCR Closed
Secondary Systems
Project Specification Consultation Report
Closed
Maintaining a reliable supply to Broken Hill
PADR 
Closed
Reliability
Project Specification Consultation Report

Project Assessment Draft Report
Closed


Closed
Managing safety and environmental risks on Line 3W (Kangaroo Valley - Capital Wind Farm)
RIT-T Complete
Transmission line



Project Assessment Conclusions Report

Project Specification Consultation Report

Closed


Closed
Managing safety and environmental risks on Line 81 (Newcastle - Liddell)
RIT-T Complete
Transmission line

Project Assessment Conclusions Report

Project Specification Consultation Report

Closed


Closed
Reinforcing the NSW Southern Shared Network to increase transfer capacity to the demand centres (HumeLink)
PADR Closed
Intraregional Capacity Transfer

Project Assessment
Draft Report (Amended)

Schematic drawings for Options 3 and 4 on page 21 of the PADR were inadvertently transposed in the document issued on 10 January, and corrected on 15 January 2020.

Project Assessment
Draft Report
 (Superseded)

Project Specification Consultation Report

Closed












Closed
Maintaining compliance with performance standards applicable to Wagga 330kV substation secondary systemRIT-T Complete


Secondary Systems Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed
Maintaining compliance with performance standards applicable to Deniliquin substation secondary system
RIT-T Complete


Secondary Systems Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed
Maintaining a reliable Static Var Compensator at Lismore
RIT-T Complete
Static Var Compensator
Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed
Maintaining compliance with performance standards applicable to Haymarket substation secondary systems
RIT-T Complete


Secondary Systems
Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed
Managing Sydney East substation's asset risksRIT-T Complete
Substation Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed
Maintaining a reliable Upper Tumut substation
RIT-T Complete
Substation
Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed
Managing safety and environmental risks from corrosion on Line 959_92Z
RIT-T Complete
Transmission line
Project Assessment Conclusions Report

Project Specification Consultation Report
Closed


Closed

Managing asset risks at South Sydney substation 

PADR Closed

Substation

Project Assessment Draft Report

Project Specification Consultation Report

Closed


Closed

Managing the Risk of Corrosion between Vineyard and Munmorah on Line 25 & 26

RIT-T Complete

Transmission line

Project Assessment Consultation Report

Project Assessment
Draft Report

Project Specification Consultation Report

Closed


Closed


Closed

Managing the Risk of Corrosion on Line 8
RIT-T Complete
Transmission line
Project Assessment Conclusions Report

Project Specification 
Consultation Report

Closed


Closed
Managing the Risk of Corrosion between Vales Point and Sydney North on Line 22
RIT-T Complete
Transmission line
Project Assessment Conclusions Report

Project Specification 
Consultation Report

Closed


Closed

Victoria to NSW Interconnector Upgrade (VNI)

RIT-T Complete

Interconnector

Project Assessment Conclusions Report

Project Assessment Draft Report

Project Specification Consultation Report

Closed


Closed


Closed

Victoria to NSW Interconnector West (VNI West)
PSCR Closed
Interconnector
Project Specification Consultation Report
Closed
Expanding NSW-QLD Transmission Transfer Capacity (QNI)

RIT-T Complete
Interconnector

Project Assessment Conclusions Report

Project Assessment Draft Report              

Project Specification Consultation Report

Closed


Closed


Closed

Submissions are welcome on the current RIT-T projects by the applicable consultation closing date.

TransGrid has a small number of projects that were committed during the transitional period, 18 September 2017 to 30 January 2018. These projects are excluded from the RIT-T process and are listed in the table below.

Project
Project description
Scheduled completion date
Lower Tumut Secondary Systems Renewal

Replacement of secondary systems equipment at Lower Tumut
June 2020
SCADA-EMS Replacement
Replacement and commissioning of the new SCADA between TransGrid sites and AEMO, as well as third parties
July 2020