Network Support Services for South West Interconnected System (SWIS) - WS5523724603
The Coordinator of Energy has determined, under clause 3.11A.4 of the Electricity System Market (ESM) Rules, to initiate a Non-Co-optimised Essential System Services (NCESS) procurement process of Network Support Services (NSS) for South West Interconnected System (SWIS) for year 2026 to 2029.
Subsequent to the Expression of Interest (EOI) process, Western Power has reviewed proponents’ submissions and refined the service requirements. Accordingly, the procurement has been revised to update the service locations, required MW quantities, and the delivery periods to 2027–28, 2028–29, and 2029–30.
We're proactively managing capacity constraints within the South West Interconnected System (SWIS). Western Power has identified a need for solutions through Network Support Services (NSS).
Call for NCESS submissions
We're inviting submissions from potential NCESS providers to deliver NSS in the multiple locations across the SWIS. These areaa have been selected based on Western Power’s assessment of the underlying need, technical requirements, and the potential for viable non-network solutions.
We are seeking service providers capable of delivering energy supply solutions or reducing energy demand at the distribution high‑voltage feeder level to ensure feeder loading remains within planning limits. These services are required for the period 1 December 2027 to 31 March 2030.
Activation requirements vary by location and feeder. Please refer to the NCESS Service Specification for detailed information on the specific requirements for each service location.
Queries may be submitted by email to emerging.technology.portfolio@westernpower.com.au or via Q&A function in VendorPanel portal.
Please submit your submissions(s) via VendorPanel no later than 5.00pm (AWST) on 30 June 2026.
Interested NCESS provider should register with VendorPanel to be informed of whether any supporting documentation such as clarifications to questions may be published.
Western Power will host a Market Briefing to provide an overview of the procurement, including key requirements, timelines, and opportunities for market participants.
Event details
- Date 11 June 2026
- Time 9:00 am – 10:00 am AWST
- Register here
| Key activities | Date |
|---|---|
| Coordinator of Energy to trigger NCESS | 15 January 2026 |
| Call for EOI’s | 12 February 2026 |
| Cut-off date for questions for EOI (extended from 12 March to 23 March) |
23 March 2026 |
| Closing date and time for lodgement of EOIs (extended from 19 March to 30 March) |
30 March 2026 |
| Call for NCESS Submissions (Tender) | 27 May 2026 |
| Cut-off date for questions from service providers | 17 June 2026 |
| Cut-off date for Western Power to answer service providers’ questions | 24 June 2026 |
| Closing date for NCESS Submission | 30 June 2026 by 5PM |
EOI documents
- NCESS Draft Service Specification – SWIS Network Support
- NCESS EOI Submission form – SWIS Network Support
- NCESS EOI Q & A - South West Interconnected System (SWIS) Network Support
- How to export GIS Data in the Interactive Network Opportunity Map (iNOM)
Call for NCESS Submission documents
- NCESS Final Service Specification – SWIS Network Support 2027-30
- NCESS Submission Form – SWIS Network Support
- NCESS – NSS draft standard contract (Western Power)
- Contract Departure Register
- NCESS Q & A - South West Interconnected System (SWIS) Network Support
- NCESS Feeders DSTR Data v2
Western Power’s NCESS Trigger Submission (January 2026)
- NCESS Trigger Submission
- View Energy Policy WA’s Coordinator of Energy determination