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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.

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).

Expression of Interest

We're inviting Expressions of Interest (EOI) from potential NCESS providers to deliver NSS in the multiple locations across the SWIS. This area has 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 2026 to 31 March 2029.

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 an NCESS Expression of Interest via VendorPanel no later than 5:00pm (AWST) on 19 March 2026.

Interested NCESS provider should register with VendorPanel to be informed of whether any supporting documentation such as clarifications to questions may be published.

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 12 March 2026
Closing Date and time for lodgement of EOIs 19 March 2026

EOI documents

Western Power’s NCESS Trigger Submission (January 2026)