On 21 October 2020, Western Power submitted an application for approval of costs for a contract it has with Synergy to provide back-up electricity from the West Kalgoorlie generators when there is a planned or unplanned outage on the 220 kV transmission line supplying the Eastern Goldfields. The contract ensures that essential services loads and most small use customers in the Eastern Goldfields continue to receive an electricity supply when there is an outage on the 220 kV transmission line.
The ERA published a draft determination for consultation on 4 March 2021 and a final determination on 29 April 2021.