Project Overview

ElectraNet has been exploring options to facilitate South Australia’s energy transformation, while helping to lower electricity prices and improve system security.

In 2016, ElectraNet began exploring options to reduce the cost of providing secure and reliable electricity, enhance power system security in South Australia, and facilitate the long-term transition of the energy sector across the National Electricity Market (NEM) to low emission energy sources.

In November 2016, ElectraNet released a Project Specification Consultation Report (PSCR) that explored the technical and economic feasibility of a new interconnector between South Australia and the eastern states as well as other non-network solution options, through the SA Energy Transformation Regulatory Investment Test for Transmission (RIT-T).

The RIT-T is the economic cost benefit test that is overseen by the Australian Energy Regulator (AER) and applies to all major network investments in the National Electricity Market.

In June 2018, a Project Assessment Draft Report (PADR) was released identifying that the construction of a new, high-capacity interconnector between South Australia and New South Wales would deliver substantial net benefits to customers.

In February 2019, following extensive consultation with stakeholders we released the SA Energy Transformation Project Assessment Conclusions Report (PACR) as the final step in the RIT-T process.

The RIT-T PACR estimated the cost of the project to be $1.53 billion with a completion date of 2022 to 2024.

To deliver the project, ElectraNet is partnering with TransGrid, the manager and operator of the high voltage electricity transmission network in NSW. Should the project be approved, TransGrid would fund the works within its jurisdiction.

In April 2019, ElectraNet requested the AER make a determination under clause 5.16.6 of the National Electricity Rules (Rules) that the preferred option identified satisfies the requirements of the RIT-T. This step was necessary as a precondition for ElectraNet and TransGrid to seek contingent project funding from the AER.

On 24 January 2020, the AER approved the RIT-T describing the business case for project as “robust” and determining that the proposed interconnector remained the most “credible option that maximises the net economic benefit” in the NEM, ultimately benefiting electricity customers.

While the AER concluded that it is “satisfied the RIT-T has been successfully completed”, it noted that “any significant changes to the costs of the preferred option could have a material impact on the outcome of the RIT-T”.

The AER’s RIT-T determination is available on the AER website.

The project also has an official name, Project EnergyConnect and a stand-alone website with public information which can be accessed at   

Updated Cost Benefit Analysis

The Rules require ElectraNet to consider whether, in its reasonable opinion, there has been a “material change in circumstances” that might lead to a change in the preferred option and thereby potentially require reapplication of the RIT-T.

Since the RIT-T was concluded with publication of the PACR in February 2019 there have been significant changes in both project costs and benefits from what was assessed in the RIT-T.

ElectraNet has been investigating whether there has been a “material change of circumstances”, taking into account this new information on both costs and benefits.

This has involved working closely with the Australian Energy Market Operator (AEMO) to update key variables and inputs that impact on the market benefits of the project to align with its 2020 Integrated System Plan (ISP). We are fully aligning our analysis to be consistent with the 2020 ISP to the extent practicable.

Firm project cost estimates for the works in South Australia and New South Wales are required to conclude the updated cost benefit analysis.

Both ElectraNet and TransGrid are committed to delivering Project EnergyConnect at the lowest possible cost to customers. However, there is a general increase in transmission costs being experienced across the NEM, with AEMO reporting in a stakeholder update on 30 April 2020 that it was incorporating an approximate 30% increase in transmission capital costs in its Final 2020 ISP for all ISP transmission projects.

Both ElectraNet and TransGrid have been working through competitive procurement processes with construction contractors to firm up capital cost estimates that will form the basis of applications to seek contingent project funding from the AER. These cost estimates are expected to be available by September 2020.

We will progress our updated cost benefit analysis in the meantime based on a range of expected cost outcomes.

Thermal Generator Variable Heat Rates

In its RIT-T determination the AER disagreed with applying Minimum Capacity Factors (MCFs) to SA Gas Powered Generation (GPG) in the modelling of market benefits.

We have, therefore, removed the use of MCFs from the updated cost benefit analysis, and instead have worked closely with AEMO to consider a more accurate representation of SA GPG operation with MCFs removed.

This includes replacing fixed or static heat rates for thermal generators with variable heat rates that more accurately represent plant behaviour at different levels of generator output.

Both ElectraNet and AEMO are now including variable heat rates for all thermal generators in the NEM in their market modelling where relevant – this provides a more accurate representation of operating efficiency and therefore fuel costs.

Previously, thermal generators were modelled based on their level of efficiency at full output regardless of their output level – this underestimates fuel consumption and therefore costs because thermal plant (especially GPG in SA) often operates at lower levels of output that is relatively less efficient and burns more fuel at these lower levels of output.

AEMO derived variable heat rates for all existing generators in the NEM from input/ output curves of new entrant technologies provided by GHD. ElectraNet engaged Aurecon to provide independent advice on variable heat rates amongst other things. This advice aligns closely with AEMO’s calculated values. Differences were observed on gas power steam turbines and brown coal plant. However, these differences are not material enough to vary from the most recent ISP parameters.

Click to view the AEMO derived variable heat rates and the Aurecon report.

South Australian System Security Requirements

AEMO has identified new emerging system security requirements for South Australia due to the continuing growth of distributed energy resources and reducing minimum demand levels. We are including these new requirements in our updated cost benefit analysis.

AEMO’s report to the Government of South Australia recommends PEC proceeds as an “essential foundational measure” to address the system security risks identified. PEC would reduce the likelihood of South Australia islanding from the NEM and alleviate the most challenging system security issues identified in AEMO’s analysis.

On 19 June 2020, the SA Government announced a plan entitled South Australian Energy Solution – A secure transition to affordable renewable energy to address the advice provided by AEMO. A central feature of this is a commitment to implement Project EnergyConnect.

Stakeholder Engagement

ElectraNet remains committed to engaging with stakeholders on Project EnergyConnect, including on our updated cost benefit analysis.

We will provide more details on our updated analysis soon after AEMO releases its Final 2020 ISP, which is expected by 30 July 2020. This will include an invitation to register to attend a stakeholder forum in August at which we will share the results of our updated cost benefit analysis and how these results were derived.

ElectraNet and TransGrid are working towards submitting complete contingent project applications to the AER as soon as practicable after firm project cost estimates for the works in South Australia and New South Wales have been finalised.

Click here to see the latest stakeholder update – July 2020.

Invitation to Provide Written Comments on Thermal Generator Variable Heat Rates

While we welcome stakeholder engagement on any aspect of our updated cost benefit analysis, we are specifically inviting submissions on the application of variable heat rates to thermal generators in the time-sequential market modelling of our updated cost benefit analysis.

If you would like to make a submission on this topic, then please send it to the address below by 7 August 2020.

How to Contact Us

If you have any comments or questions in relation to ElectraNet’s updated cost benefit analysis for PEC or any other aspect of this stakeholder update then please contact us at and we will be happy to arrange an opportunity to discuss.

Project Assessment Conclusions Report

Project Assessment Conclusions Report (PDF, 5903 KB)

PACR - Supplementary reports

Special Protection Scheme Report (May 2019) (PDF, 2 MB)
PACR Market Modelling Methodology Report (PDF, 1944 KB)
SA Energy Transformation RIT-T External Review (Oakley Greenwood) (PDF, 448 KB)
Gas Price Forecast Review (EnergyQuest) (PDF, 135 KB)
Network Technical Assumptions Report (PDF, 1726 KB)
SAET RIT-T Consolidated Non Interconnector Option (Entura) (PDF, 1371 KB)
Investigation of Interim Arrangements (Entura) (PDF, 2719 KB)
Project note responding to PADR submissions (Entura) (PDF, 791 KB)
Curnamona Province Analysis (AME Advisory) (PDF, 495 KB)
Cost Estimate Report (PDF, 1660 KB)
ElectraNet Transmission Line Cost Review (Jacobs) (PDF, 1581 KB)
SA-NSW Interconnection – Analysis of Impacts on Liquidity in SA (CQ Partners) (PDF, 1640 KB)
SA-NSW Interconnector – Updated Analysis of Potential Impact on Electricity Prices and Assessment of Broader Economic Benefits (ACIL Allen) (PDF, 1247 KB)
Note on selection of an assessment period for a RIT-T and the use of terminal values (HoustonKemp) (PDF, 218 KB)
Market Modelling and Assumptions Data Book (Excl, 185 KB)
Market Modelling Result Books (Excl, 1591 KB)
Economic Evaluation Summary Spreadsheet and Charts (Excl, 3271)
Incremental NPV Benefits of Red Cliffs to Buronga Line (Excl, 57 KB)

PADR - Submissions

AGL (PDF, 68 KB)
Central Irrigation Trust (PDF, 155 KB)
Meridian Energy (PDF, 85 KB)
Solar Reserve (PDF, 675 KB)
SA Government (PDF, 4 MB)
Fresh Eyre (PDF, 50 KB)
Ausker (PDF, 580 KB)
Business SA (PDF, 60 KB)
Charles Sturt University (PDF, 215 KB)
ARC Mesh (PDF, 315 KB)
Powerlink (PDF, 120 KB)
Tasmanian Department of State Growth (PDF, 90 KB)
Total Environment Centre (PDF, 140 KB)
AusNet Services (PDF, 400 KB)
Australian Energy Council (PDF, 330 KB)
Delta Electricity (PDF, 1,600 KB)
Energy Australia (PDF, 300 KB)
Energy Consumers Australia (PDF, 70 KB)
Energy Users Association of Australia (PDF, 830 KB)
Havilah (PDF, 1.6 MB)
Lyon Group (PDF, 185 KB)
Maoneng (PDF, 45 KB)
Origin (PDF, 330 KB)
Public Interest Advocacy Centre (PDF, 125 KB)
Renew Estate (PDF, 765 KB)
Science Party of NSW (PDF, 60 KB)
SEA Gas (PDF, 170 KB)
Smart Wires (PDF, 150 KB)
Snowy Hydro (PDF, 155 KB)
The Energy Project (PDF, 1 MB)
The Energy Project - Supplementary submission (PDF, 372 KB)
Tilt Renewables (PDF, 142 KB)
TransGrid (PDF, 240 KB)

Public forums

Adelaide public forum presentation - July 2018 (PDF, 5 MB)
Sydney public forum presentation - August 2018 (PDF, 4 MB)
Deep dive presentation - August 2018 (PDF, 758 KB)
Public forums feedback summary (PDF, 109 KB)

Documents Published in response to requests at public forums - August 2018

The total cost of the non-interconnector option (PDF, 200KB)
Net Present Value model output for the low scenario (Excel, 750KB)
Net Present Value model output for the central scenario (Excel, 750KB)
Net Present Value model output for the high scenario (Excel, 770KB)
Datasheets sitting behind PADR figures and charts (Excel, 200KB)
Generator expansion for all scenarios (modelling outputs) (Excel, 800KB)
Functional Specifications of line options (PDF, 420 KB)

Project Assessment Draft Report (PADR) and associated reports - June 2018

SAET - Project Assessment Draft Report (PDF, 3 MB)
Information Sheet - SA Energy Transformation (PDF, 3 MB)
Basis of Estimate for PADR (PDF, 1 MB)
Network Technical Assumptions (PDF, 617 KB)
SA - NSW Interconnector - Preliminary Projected Impact on Electricity Prices (ACIL Allen) (PDF, 342 KB)
Gas Price Forecast Review (PDF, 134 KB)
Consolidated Non-Interconnector Option (PDF, 1 MB)
Market Modelling Report (PDF, 1 MB)
Market Modelling and Assumptions Data Book (Excel, 213 KB)
RIT-T Market Modelling High Level Review (Oakley Greenwood) (PDF, 182 KB)

Project Specification Consultation Report (PSCR) and associated reports - November 2016

Fact Sheet - Exploring South Australia's Energy Transformation (PDF, 980 KB)
South Australian Energy Transformation forum (PDF, 2 MB)
Market Modelling Approach and Assumptions Report (PDF, 759 KB)
SAET Supplementary Information Paper (PDF, 670 KB)

Project Specification Consultation Report (PSCR)


Project Assessment Draft Report (PADR)


Project Assessment Conclusions Report (PACR)


SAET Supplementary Information Paper

Learn more about the identified need, services that could meet it, and next steps in our process for the SA Energy Transformation project.


Project Specification Consultation Report South Australian Energy Transformation

ElectraNet is undertaking a Regulatory Investment Test for Transmission (RIT-T) to explore potential solutions to help address the increasing challeng...


Fact Sheet South Australian Energy Transformation

ElectraNet is exploring potential solutions to help address the increasing challenges of transitioning towards a low-carbon future and...


South Australian Energy Transformation Forum Presentation

View the presentation provided at our South Australian Energy Transformation forum.


South Australian Energy Transformation RIT-T Market Modelling Approach and Assumptions Report

Read this consultation report which outlines the proposed methodology for assessing options considered in the South Australian Energy Transformation R...