BESS · Barnawartha Solar Pty Ltd · Storage - Battery
13 Jun 2026 09:45 → 14 Jun 2026 09:45 AEST
| Capex total (greenfield) |
$210.18M
Shown in table How this was derived Reference |
|---|---|
| Capex refurbishment |
—
|
| Capex / MW derived |
$43,336,772
Shown in table How this was derived Reference |
| Fixed OPEX (annual) |
$1.70M
Shown in table How this was derived Reference |
| Fixed OPEX / MW-yr |
$26,585
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
No generator-specific EPC contract value, total project capex, fixed O&M contract, variable O&M contract, battery augmentation budget, or closure plan was found publicly. Capex is an estimate using 2025 GenCost-derived current-policy benchmark values cited in public material: AUD 1,621/kW for large-scale solar PV and AUD 525/kWh for 2-hour large-scale BESS. Scope assumed: 64.02 MWac solar generation plus 138.8 MWh BESS, consistent with the Australian Government CIS winner list for Barnawartha; this conflicts with the user-provided Storage MWh value of 6.31, which appears inconsistent with public project descriptions. Fixed O&M is a default estimate: solar PV at AUD 12/kW-year from GenCost 2024-25 implementation documentation plus BESS at 1.0% of estimated BESS capex per year. Variable O&M, fuel cost and scope-1 emissions intensity are set to zero as technology defaults for solar PV/BESS. Efficiency is estimated from 92.2% charge and 92.2% discharge efficiency noted for battery modelling, giving about 85.0% round-trip efficiency. Asset life is set to 20 years reflecting AEMO battery technical life; solar PV modules may have a longer design life, commonly around 30 years, but the hybrid profile is constrained by the BESS life. Major refurbishment likely means battery augmentation/replacement around the 2040s if energised in 2027; no project-specific refurbishment or closure announcement was found.
No reported project-level capex or O&M contract value was found. The capex estimate combines: 88 MWp solar PV EPC plus land/development from Aurecon 2024 mid-size utility solar assumptions; 64 MW / 148 MWh BESS EPC plus land/development from Aurecon 2024 40 MW / 80 MWh BESS component-cost assumptions; and the reported AUD 1.5 million overhead transmission-line planning estimate. Estimated capex total is nominal AUD 2025 and should be treated as a screening assumption, not a reported financial close value. Storage capacity is conflicting: AEMO Services CIS table reports 148 MWh; PV Tech reported 138.8 MWh; Gentari's project page states 64 MW/2hr BESS, implying 128 MWh; the user prompt listed 6.31 MWh. I used the AEMO Services CIS value of 148 MWh for capex scaling because it is the official tender-results source. capex_per_mwh_aud is for the BESS-only estimated capex divided by 148 MWh; capex_per_mw_aud is total hybrid capex divided by 64.02 MW. Asset life is set to 20 years for the BESS component; solar PV design life default is 30 years. No public closure date was found; owner timeline indicates energisation/site operational in 2027, so closure/refurbishment is not currently scheduled. Aurecon notes BESS life may be extended to around 25 years after condition assessment and with battery upgrades; solar PV technical life may reach 40 years if piles do not corrode and spare parts remain available.
No generator-specific EPC contract value, financial close announcement, reported capex, O&M contract, or DUID was found in public sources. Capex is an estimate using Aurecon/AEMO 2025 cost inputs: solar component assumes Gentari's 88 MWp utility-scale solar scope at AUD 1.30/Wdc EPC plus land/development equal to 10% of equipment cost; BESS component assumes AEMO Services' 64 MW / 148 MWh CIS scope and Aurecon 40 MW/80 MWh BESS cost components of AUD 516/kW power plus AUD 344/kWh energy, plus land/development estimated as 5% of equipment cost. Fixed opex is estimated as solar AUD 12,000/MWp-year plus scaled BESS annual O&M and 20-year warranty allowance from Aurecon. Storage capacity is conflicting across sources: AEMO Services lists 148 MWh, Gentari LinkedIn lists 138.8 MWh, and Gentari's project page states 64 MW/2 hr BESS (implied ~128 MWh). The user-provided Storage MWh of 6.31 could not be corroborated and appears inconsistent with current project sources. Asset life is set to 20 years reflecting BESS design/technical life; solar PV design/technical life is 30 years. Project website indicates financial close expected early 2026, mobilisation late 2026, energisation/site operational in 2027; therefore assumptions are pre-construction and should be reviewed after financial close/EPC award.