Regulatory Investment Tests

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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	9 November 2020
Improving stability in south-western NSW	Consultation Open	Increase network stability limits	Project Specification Consultation Report	26 October 2020
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	Closed
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 system	RIT-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 risks	RIT-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