❓ Mr. Hunter inquires about the performance of Stand-alone Power Systems (SPS) in WA, focusing on outage reduction, customer satisfaction, renewable energy contribution, and diesel generator usage. The response provides data on renewable energy percentages and generator run-times, indicating a move towards higher renewable energy reliance.
AnsweredQoN 501Legislative Assembly
QuestionView source ↗
I refer to the performance and outcomes of Stand-alone Power Systems (SPS) in Western Australia, and I ask: (a) what data is available on the reduction in power outages for customers transitioned to SPS; (b) what customer satisfaction metrics are used to assess the performance of SPS: (i) how do these metrics compare to traditional grid-connected customers; (c) what percentage of the energy supplied by a SPS is expected to come from renewable sources; (d) what are the minimum operational requirements for the diesel backup generator component of each SPS; and (e) are generator run-times monitored: (i) if so, what are the average weekly or monthly usage figures?
AnswerView source ↗
Answered
14 October 2025
Responded by
Minister for Energy and Decarbonisation
Response time
8 days
(a) - (b)
The metrics used for SPS are consistent with those used for grid-connected customers.
(c) Horizon Power’s existing SPS units are providing approximately 80 per cent renewable energy, with some 100 per cent renewable units to be delivered in Round 5. Western Power’s existing SPS units are expected to provide at least 90 per cent renewable energy from Round 3 (currently in delivery) onwards.
(d) Horizon Power and Western Power are required to provide a network equivalent connection that meets Australian Standards, the Western Australian Services and Installation Requirements (WASIR), and Construction and Environmental standards.
(e) Yes. Western Power and Horizon Power monitor generator run-times on a monthly basis. For Western Power, the average monthly generator run-time is approximately 18 hours. For Horizon Power, the average monthly generator run-time for 2024-25 was 22 hours.
The metrics used for SPS are consistent with those used for grid-connected customers.
(c) Horizon Power’s existing SPS units are providing approximately 80 per cent renewable energy, with some 100 per cent renewable units to be delivered in Round 5. Western Power’s existing SPS units are expected to provide at least 90 per cent renewable energy from Round 3 (currently in delivery) onwards.
(d) Horizon Power and Western Power are required to provide a network equivalent connection that meets Australian Standards, the Western Australian Services and Installation Requirements (WASIR), and Construction and Environmental standards.
(e) Yes. Western Power and Horizon Power monitor generator run-times on a monthly basis. For Western Power, the average monthly generator run-time is approximately 18 hours. For Horizon Power, the average monthly generator run-time for 2024-25 was 22 hours.
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