03 Jun 2026 18:00 → 04 Jun 2026 18:00 AEST
| Capex total (greenfield) |
$845.09M
Shown in table How this was derived Reference |
|---|---|
| Capex refurbishment |
—
|
| Capex / MWh storage |
$315,804
Shown in table How this was derived Reference |
| Fixed OPEX (annual) |
$8.69M
Shown in table How this was derived Reference |
| Fixed OPEX / MW-yr |
$37,300
Shown in table How this was derived Reference |
| Variable OPEX / MWh |
$0.00
Shown in table How this was derived Reference |
| Fuel cost / GJ |
$0.00
Shown in table How this was derived Reference |
| Heat rate GJ/MWh |
—
How this was derived Reference |
Confidence: medium · Status: ai estimated · Capex basis: estimated · AI checked 04 Jun 2026
Notes
Bannaby BESS is still in planning / Prepare EIS status and no project-specific EPC price, financial close capex, fixed O&M, variable O&M, battery augmentation plan, or DUID was found. Capacity is conflicting across sources: the owner site describes up to 700 MW; the NSW Planning Portal describes approximately 750 MW / 3,000 MWh; ASL's February 2026 Tender Round 6 outcome identifies the LTESA-awarded Bannaby BESS configuration as 233 MW / 2,676 MWh with 11.5 hours duration. Financial estimates here are scaled to the latest ASL-backed contracted configuration of 233 MW / 2,676 MWh, not the user's 700 MW placeholder. Estimated capex uses GenCost 2024-25 / Aurecon 2024-25 large-scale 12-hour battery total-cost-basis value of AUD 885/kWh, because Bannaby's ASL duration is 11.5 hours. Fixed opex is a default estimate of 1% of estimated capex per year, based on open-access Australian modelling that assumes Li-ion battery annual O&M at 1% of capital cost; this is not a reported Bannaby value. Variable opex is set to AUD 0/MWh as a modelling default for batteries, excluding charging energy costs, market fees, network charges, augmentation and degradation costs. Efficiency is a default round-trip battery efficiency assumption, not a reported site value. Asset life uses the owner website statement that the project will be remotely operated for at least 30 years, but GHD/AEMO notes that most OEM battery products have design life up to 20 years, so material battery augmentation or replacement is likely during a 30-year project life. Closure/refurbishment: no Bannaby-specific closure date was found; project timeline indicates construction subject to approvals in 2027 and Stage 1 operations in 2029.
No reported Bannaby BESS capex was found in public sources. Capex is estimated using Aurecon/AEMO 2024 large-scale Li-ion BESS cost parameters for an 8-hour standalone BESS with dedicated grid connection: $522/kW power component and $266/kWh energy component, extrapolated to the ASL-contracted Bannaby configuration of 233 MW / 2,676 MWh, plus a pro-rated land/development allowance. This produces an indicative nominal 2024 capex of about A$845.1m. The user's generator record states 700 MW and no storage MWh; public sources conflict/evolved: the owner website says up to 700 MW, NSW planning/agency material refers to 750 MW / 3,000 MWh, while ASL Tender Round 6 confirms the awarded LTESA project as 233 MW / 2,676 MWh with 11.5 hours duration. Financial assumptions in this record are based on the current ASL-contracted 233 MW / 2,676 MWh configuration. Fixed opex includes Aurecon 8-hour BESS fixed O&M of A$22,500/MW-year plus extended-warranty allowance of A$14,800/MW-year; variable O&M is left null because Aurecon states BESS long-term service agreements are not typically fixed/variable. Owner/project website states at least 30 years operation; Aurecon indicates large-scale Li-ion battery economic/technical life of 20 years and potential extension to about 25 years or project-life extension with battery upgrades, so major battery augmentation/replacement should be expected before a 30-year project life. Direct operational emissions intensity is treated as zero for the battery at the point of discharge; lifecycle and charging-energy emissions are excluded.