Energy and annual cost of the grid
A$862m a year at 525 MW.
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The grid’s annual cost is the capital of solar, wind, batteries and transmission annualised at an 8% real pre-tax WACC, plus fixed O&M and the fuel for gas backup. Existing gas plant is treated as sunk. Removing Iron Bridge leaves the grid the same size, so its cost hardly changes while its output used falls.
Sources: CSIRO GenCost 2025-26; Fortescue FY26 reports; PVGIS; Renewables.ninja; ITK model.