Whole of System Planning provides an informed view on what Western Australia’s principal electricity system, the South West Interconnected System (SWIS), might look like over the coming decades.
The Minister for Energy released the inaugural Whole of System Plan (WOSP) in October 2020, developed by a project team led by Energy Policy WA with representatives from the Australian Energy Market Operator (AEMO) and Western Power.
On 1 July 2021, the Coordinator of Energy was given ongoing responsibility for system planning under the Wholesale Electricity Market (WEM) Rules, and a requirement to undertake system planning at least once every five years. The next WOSP must be delivered by 30 September 2025 at the latest.
In the interim, the State Government is undertaking a fast-tracked assessment of future renewable electricity demand, to respond to emerging industry decarbonisation ambition. More information on this SWIS Demand Assessment can be found here.
The Whole of System Plan 2020
The Whole of System Plan (WOSP), launched in October 2020, is a detailed study of how our major power system may evolve over 20 years.
Using data provided by industry, the plan models four scenarios of how changes in demand, technology, and the economy may shape the way we use electricity and guide the investments we make over the coming decades to achieve lowest-cost, lower-emissions electricity.
To support the WOSP Report, an information sheet provides an overview of the methodology and input assumptions used to model the four WOSP scenarios: Cast Away, Groundhog Day, Techtopia and Double Bubble.
Appendix A contains the modelling methodology and assumptions and Appendix B provides the Assumptions Workbook in Excel format. Appendix C details modelling outputs and commentary and Appendix C - Modelling outputs provide a modelling workbook in excel format.
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Whole of System Plan - Consultation
The Whole of System Plan modelling inputs were developed and tested via more than 70 meetings with energy sector stakeholders. This included one-on-one meetings with industry participants, investors and advocacy groups.
Stakeholders provided feedback on the modelling scenarios and the various inputs and assumptions. In many cases, stakeholders shared critical data such as operating costs, expected returns and plant characteristics. This information helped to improve the quality of the WOSP modelling inputs and therefore the robustness of modelling outputs.
As some of this information is confidential, it has not been included in the Information Paper or Assumptions Workbook below.
