03 Jun 2026 17:20 → 04 Jun 2026 17:20 AEST
| Capex total (greenfield) |
$500.00M
Shown in table How this was derived Reference |
|---|---|
| Capex refurbishment |
—
|
| Capex / MW |
$1,388,889
Shown in table How this was derived Reference |
| Capex / MWh storage |
—
|
| Fixed OPEX (annual) |
$10.08M
Shown in table How this was derived Reference |
| Fixed OPEX / MW-yr |
$28,000
Shown in table How this was derived Reference |
| Variable OPEX / MWh |
$0.00
Shown in table |
| Fuel cost / GJ |
—
How this was derived Reference |
| Heat rate GJ/MWh |
—
How this was derived Reference |
Confidence: medium · Status: ai estimated · Capex basis: reported · AI checked 04 Jun 2026
Notes
Barn Hill has an older publicly announced NEM listing at 124-186 MW / 62 turbines and no DUID. Current AGL and Australian Industry Participation documents describe an enlarged project of up to 50 WTGs, up to 360 MW, a new 275 kV transmission connection and a later-stage 270 MW / 4-hour battery. The capex value is the official AIP threshold '$500 million or more' for the project phase, so the numeric capex_total_aud is a lower-bound nominal 2026 reported value, not a final EPC or financial-close cost. capex_per_mw_aud is calculated using the current maximum wind scope of 360 MW; if calculated against the older 186 MW NEM listing, the lower-bound value would be about AUD 2.69 million/MW. Fixed O&M and variable O&M are not project-specific reported Barn Hill values; they use AEMO/Aurecon 2024 onshore-wind defaults. fixed_opex_annual_aud is calculated as AUD 28,000/MW-year × 186 MW because the generator record supplied by the user lists 186 MW; if the current 360 MW development scope is used, the same default gives AUD 10.08 million/year. Variable O&M is recorded as 0 because the AEMO/Aurecon default states variable O&M is included in fixed O&M. Heat rate and thermal efficiency are not applicable to wind generation. No generator-specific major refurbishment was found; AGL states asset life about 35 years, while AEMO/Aurecon notes onshore wind technical/operational life of 30-35 years with site-specific life extension and increased later-life maintenance. AGL project timeline states development approval on 31 January 2025, FID for wind farm and associated infrastructure anticipated late 2025, construction early 2026 and operations late 2028; the AIP plan lists completion date 11 January 2028.
Barn Hill is not yet an operating NEM generator and no DUID was found. The supplied 186 MW capacity appears to reflect an older proposal: AEMO’s 2017 South Australian Fuel and Technology Report listed Barn Hill Wind Farm as 124-186 MW, while AGL’s current project materials describe up to 360 MW wind capacity plus a later-stage 270 MW / 4-hour battery, and AGL’s 2025 annual report map lists Barn Hill Wind Farm at 300 MW. Capex is reported only as a threshold: the approved AIP Plan states capital expenditure of $500 million or more for the current up-to-360 MW wind-farm project and associated infrastructure. capex_per_mw_aud is therefore a minimum value calculated as $500m / 360 MW, not a final EPC price. Fixed and variable O&M are generic AEMO/Aurecon 2024 onshore-wind assumptions applied to the current 360 MW wind scope; fixed_opex_annual_aud = 360 MW * $28,000/MW-year. No Barn Hill-specific O&M contract, PPA, turbine supply contract, debt/project-finance announcement, heat-rate/efficiency value, or exact closure date was found. AGL’s current webpage says development approval was granted on 31 January 2025 and that FID for the wind farm and associated infrastructure is anticipated in the second half of 2026, with the battery investment decision expected later. Earlier July 2025 AGL material stated late-2025 FID, so the current webpage is treated as the latest status. End-of-life treatment per AGL is either decommissioning or refurbishment subject to approvals, with decommissioning and rehabilitation plan requirements.
Barn Hill appears to have changed scope over time. Older AGL/AEMO listings describe 124-186 MW and the user-provided capacity is 186 MW; current AGL and Department of Industry materials describe an enlarged project of up to 360 MW plus transmission connection and a later-stage 270 MW / 4-hour battery. The reported capex is only a threshold: 'Capital expenditure: $500 million or more' for the current Barn Hill Wind Farm AIP project, not an exact EPC cost. Fixed O&M and variable O&M are not project-specific public values; they are estimated from AEMO/Aurecon 2024 onshore wind assumptions and scaled to the user-provided 186 MW capacity. For wind, heat rate and thermal efficiency are not applicable; operational direct emissions intensity is treated as 0 tCO2-e/MWh because there is no combustion fuel. AGL's live project page states FID for the wind farm is anticipated in the second half of 2026, whereas the July 2025 factsheet said late 2025; the later webpage is treated as more current. No major refurbishment notes found; asset life/life-extension basis is 30-35 years operational life, with AGL stating about 35 years.