Australian NEM Generators

Effective from	MLF
2024-07-01	0.9977
2025-07-01	0.9986

2026 real AUD. All monetary values in this table are expressed in 2026 real Australian dollars, adjusted from source-year nominal figures using Australian CPI (All Groups), real AUD. Greenfield capex uses AEMO technology benchmarks when plant-specific construction cost is unknown; refurbishment costs are shown separately from original build capex.

Type

OCGT

Capacity

40 MW

Revenue (× MLF) (stats)

See dispatch stats link above

Est. SRMC

$182.63/MWh

Capex total (greenfield)	$16.67M
Capex refurbishment	—
Capex / MW	$416,667
Capex / MWh storage	—
Fixed OPEX (annual)	$520.0k
Fixed OPEX / MW-yr	$13,000
Variable OPEX / MWh	$7.93
Fuel cost / GJ	$14.51
Heat rate GJ/MWh	12.04

Confidence: medium · Status: ai estimated · Capex basis: estimated · AI checked 04 Jun 2026

Notes: Specific financial details for Bell Bay Three are not available in public domain or recent reports.

[AI 2026-06-04] BBTHREE1 is one of the three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units at Tamar Valley/Bell Bay Three. Generator-specific construction cost, fixed O&M, VOM, and current fuel prices were not publicly found. Capex is estimated by allocating the reported A$75m 2007 acquisition of the 105 MW Bell Bay peaking station/assets across three units; scope likely included site/assets and gas pipeline capacity agreements, not a greenfield construction EPC cost. Fixed O&M and VOM use AEMO/Aurecon 2024 small aero-derivative OCGT defaults, excluding fuel. Heat rate and efficiency use Mitsubishi Power published FT8 SWIFTPAC 60 50 Hz package values as a proxy for FT8 Twin Pac. Emissions intensity uses a public AEMO-attributed generator emissions factor dataset; ACIL Allen/AEMO emissions review confirms Bell Bay Three as a gas OCGT in the emissions factor set but the exact numeric value was not machine-readable from the PDF figures. Closure data is conflicting/stale: nemstats/AEMO-derived data lists BBTHREE1 in service with an expected closure date of 2025-07-02, while AEMO 2025-26 MLF tables still list BBTHREE1.

[AI 2026-06-04] BBTHREE1 is one of the three Bell Bay Three / Tamar Valley FT8 OCGT units. Original project capex was reported for all three 38.75 MVA gas turbine units, not individually by DUID; the capex_total_aud and capex_per_mw_aud above allocate the reported $52.409m project cost equally across three 40 MW NEM units. Fixed and variable O&M are not generator-specific public values; defaults use Aurecon/AEMO 2024 small aero-derivative OCGT assumptions excluding fuel. AEMO provides a generator-specific static heat rate for Bell Bay Three of 12.04 GJ/MWh HHV. Emissions intensity is calculated as 12.04 GJ/MWh x 51.53 kg CO2-e/GJ for pipeline natural gas. Hydro material from 2016 says the FT8 units were second-hand when purchased and were then approaching end of life; however, Hydro’s current station page and 2023-24 AER show the FT8s remain part of the operating TVPS fleet, with Unit 103B in long-term in-situ storage. For BBTHREE1/Unit 101, 2023-24 AER notes FT8 NOx issues, management of FT8 operating hours, and expectation of minimal near-term FT8 operation after a November 2023 stack-testing non-compliance.

[AI 2026-06-04] Bell Bay Three comprises three Pratt & Whitney FT8 Twin Pac OCGT units now reported within Tamar Valley Power Station's OCGT fleet. Hydro Tasmania reported AUD 50 million for acquisition and installation of three 35 MW gas turbines in FY2005/06; the capex_total_aud shown here is an allocated one-third estimate for DUID BBTHREE1, while capex_per_mw_aud preserves the reported package cost divided by the reported 105 MW scope. Hydro Tasmania now describes the three units as 3 x 40 MW; AEMO/Hydro historical sources describe the original scope as 3 x 35 MW / 105 MW. Fixed O&M, variable O&M, heat rate, efficiency and life are technology-default assumptions from Aurecon/AEMO 2024 small OCGT parameters because BBTHREE1-specific cost/performance values were not found. Emissions intensity is calculated from the default HHV heat rate at maximum operation of 10.489 GJ/MWh multiplied by the 2025 Australian NGA natural-gas stationary-combustion factor of 51.53 kg CO2-e/GJ. Closure/refurbishment notes: the FT8 fleet remains used as-needed; AETV reported Unit 103B was taken offline during 2017/18 and remains permanently in long-term in situ storage, and reported ongoing NOx issues and minimal near-term FT8 operation after a 2023 stack-testing non-compliance. This affects the Bell Bay Three fleet but not necessarily BBTHREE1 alone.

[AI 2026-06-04] Bell Bay Three comprises three small aero-derivative OCGT units originally acquired from the United States and installed in 2005-06; the reported project cost was AUD 50 million for all three 38.75 MVA units including installation and associated transmission upgrades. The capex_total_aud shown here is a pro-rata single-DUID allocation for BBTHREE1, not a separately reported unit-level contract price. O&M, heat rate, efficiency, emissions intensity and asset life are technology-default estimates for small OCGT/small gas turbines from AEMO/Aurecon 2024 assumptions, not Bell Bay Three-specific operating data. Emissions intensity is derived as 10.489 GJ/MWh HHV heat rate multiplied by the Australian NGA 2025 pipeline natural gas Scope 1 factor of 51.53 kg CO2-e/GJ. AEMO/Nemstats lists BBTHREE1 as 40 MW and in service with an expected closure date of 2025-07-02, but the Tasmanian Economic Regulator 2024-25 review states the Tamar Valley OCGT units remain available at all times; treat closure status as needing review against the latest AEMO April 2026 generation-information workbook.

[AI 2026-06-04] Bell Bay Three consists of three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units. The reported 2006 capex was $50 million for the three-unit Bell Bay Three project, including purchase/installation of gas turbines and associated transmission upgrades; the value entered for BBTHREE1 is a one-third pro-rata allocation and is therefore marked estimated. O&M and heat-rate assumptions are from public modelling sources for Bell Bay Three/OCGT and are not confirmed as current owner budget values. Emissions intensity is taken from an older ACIL Tasman total CO2-e intensity for Bell Bay Three including fugitive emissions; using current NGA 2025 direct-combustion factor only and AEMO static heat rate would imply about 0.62 tCO2-e/MWh generated. Closure information is conflicting/uncertain: Nemstats reports expected closure 2025-07-02, while AEMO 2025-26 MLF documents still list BBTHREE1 as a Tasmanian generator for FY2025-26.

Sources

Capex Total (low)
O&M Costs (low)
Efficiency and Heat Rate (low)
Emissions Intensity (low)
generator_identity_and_capacity — Australian NEM Generators - Bell Bay Three (medium)
unit_configuration — Tamar Valley Power Station (high)
online_date — Tamar Valley Power Station (high)
capex_total_aud — Tamar Valley Power Station, Tasmania (low)
capex_scope — Tasmania's energy security and Tamar Valley Power Station - RTI release (medium)
fixed_opex_per_mw_year_aud — 2024 Energy Technology Cost and Parameters Review (medium)

Last AI response

Raw extraction below is pre-escalation (nominal source-year values). Values saved to the profile and shown in the table above are adjusted to 2026 real AUD.

Model: gpt-5.5 · Reasoning: medium · Fetched 04 Jun 2026 09:07 · ID: resp_0781291f0b3985fe006a20b32584388195ac926928e15f61af

Parsed extraction JSON

{
    "generator_identity": {
        "site_name": "Bell Bay Three",
        "duid": "BBTHREE1",
        "owner": "AETV Pty Ltd",
        "region": "TAS1",
        "technology_type": "Turbine - OCGT",
        "fuel_type": "Fossil - Natural Gas Pipeline"
    },
    "financial_profile": {
        "generator_type_normalised": "ocgt",
        "capex_total_aud": 16666666.67,
        "capex_year": 2006,
        "capex_basis": "estimated",
        "capex_per_mw_aud": 416666.67,
        "capex_per_mwh_aud": null,
        "fixed_opex_annual_aud": 520000,
        "fixed_opex_per_mw_year_aud": 13000,
        "variable_opex_per_mwh_aud": 7.93,
        "fuel_cost_per_gj_aud": null,
        "fuel_contract_notes": "No public BBTHREE1-specific gas commodity price was found. Public sources indicate Bell Bay Three/Tamar Valley is supplied by the Tasmanian Gas Pipeline from Longford/Gippsland to Bell Bay. Hydro Tasmania has had gas transportation arrangements with TGP, including a 2007 pipeline capacity agreement liability/obligation and a later agreement commencing 1 January 2022. ACIL Allen/AEMO publishes modelled GPG gas price paths for Bell Bay Three in 2025 AUD/GJ, but the chart values are not tabulated in the accessible source text, so no numeric fuel price is populated.",
        "heat_rate_gj_per_mwh": 12.04,
        "efficiency_pct": 29.9,
        "emissions_intensity_tco2_mwh": 0.69,
        "asset_life_years": 25,
        "discount_rate_pct": null,
        "source_confidence": "medium",
        "data_status": "partially_verified",
        "notes": "Bell Bay Three consists of three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units. The reported 2006 capex was $50 million for the three-unit Bell Bay Three project, including purchase/installation of gas turbines and associated transmission upgrades; the value entered for BBTHREE1 is a one-third pro-rata allocation and is therefore marked estimated. O&M and heat-rate assumptions are from public modelling sources for Bell Bay Three/OCGT and are not confirmed as current owner budget values. Emissions intensity is taken from an older ACIL Tasman total CO2-e intensity for Bell Bay Three including fugitive emissions; using current NGA 2025 direct-combustion factor only and AEMO static heat rate would imply about 0.62 tCO2-e/MWh generated. Closure information is conflicting/uncertain: Nemstats reports expected closure 2025-07-02, while AEMO 2025-26 MLF documents still list BBTHREE1 as a Tasmanian generator for FY2025-26."
    },
    "sources": [
        {
            "field_name": "site_identity_capacity_status",
            "value_text": "Owner AETV Pty Ltd; Status In Service; Technology Type Turbine - OCGT; Fuel Type Fossil - Natural Gas Pipeline; DUID BBTHREE1; Capacity 40 MW; Expected Closure Year 2025-07-02.",
            "value_numeric": 40,
            "unit": "MW",
            "source_url": "https://nemstats.com.au/generator.php?short_url=bell-bay-three---turbine---ocgt---bbthree1",
            "source_title": "Australian NEM Generators - Bell Bay Three",
            "publisher": "Nemstats",
            "published_date": "2025",
            "confidence": "medium",
            "raw_excerpt": "Owner: AETV Pty Ltd; Status: In Service; Technology Type: Turbine - OCGT; Fuel Type: Fossil - Natural Gas Pipeline; DUID: BBTHREE1; Capacity: 40 MW; Expected Closure Year: 2025-07-02.",
            "ai_summary": "Confirms the registry identity used for BBTHREE1 and gives the 40 MW capacity and expected closure date shown in the Nemstats mirror of NEM generator data."
        },
        {
            "field_name": "site_configuration",
            "value_text": "Tamar Valley Power Station has 178 MW of open-cycle gas generation from a 58 MW Rolls Royce Trent 60WLE and 3 x 40 MW Pratt & Whitney FT8 Twin Pac.",
            "value_numeric": 40,
            "unit": "MW",
            "source_url": "https://www.hydro.com.au/our-energy-system/our-power-stations/tamar-valley-power-station",
            "source_title": "Tamar Valley Power Station",
            "publisher": "Hydro Tasmania",
            "published_date": null,
            "confidence": "high",
            "raw_excerpt": "The 386 MW station has 208 MW of combined-cycle gas generation (CCGT) from a Mitsubishi M701DA turbine and 178 MW of open-cycle gas generation (OCGT) from a 58 MW Rolls Royce Trent 60WLE and 3 x 40 MW Pratt & Whitney FT8 Twin Pac.",
            "ai_summary": "Owner/operator page confirms that the Bell Bay Three units are three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units within the Tamar Valley/Bell Bay gas generation fleet."
        },
        {
            "field_name": "capex_total_aud",
            "value_text": "Reported Bell Bay Three project cost was $50 million for three 38.75 MVA gas turbine units installed during 2005-06/2006-07; BBTHREE1 capex is estimated as one-third of total.",
            "value_numeric": 16666666.67,
            "unit": "AUD",
            "source_url": "https://www.hydro.com.au/docs/default-source/about-us/our-governance/annual-reports/hydro-tasmania-annual-report-2006.pdf?sfvrsn=fb6e1328_2",
            "source_title": "Hydro Tasmania Annual Report 2006",
            "publisher": "Hydro Tasmania",
            "published_date": "2006",
            "confidence": "high",
            "raw_excerpt": "Gas turbines were purchased from the United States and installed during the past year at a total project cost of $50 million. The commissioning of the three 38.75 MVA gas turbine units in 2006/2007 will bring generation capacity to 345 MW. Transmission lines were also upgraded...",
            "ai_summary": "Hydro Tasmania reported the Bell Bay Three project cost as $50 million for three units. For this single DUID, a one-third allocation is used."
        },
        {
            "field_name": "capex_year",
            "value_text": "Installation during 2005-06 with commissioning of the three units in 2006/2007; capex year assigned to 2006 nominal reporting year.",
            "value_numeric": 2006,
            "unit": "year",
            "source_url": "https://www.hydro.com.au/docs/default-source/about-us/our-governance/annual-reports/hydro-tasmania-annual-report-2006.pdf?sfvrsn=fb6e1328_2",
            "source_title": "Hydro Tasmania Annual Report 2006",
            "publisher": "Hydro Tasmania",
            "published_date": "2006",
            "confidence": "high",
            "raw_excerpt": "Gas turbines were purchased from the United States and installed during the past year at a total project cost of $50 million. The commissioning of the three 38.75 MVA gas turbine units in 2006/2007...",
            "ai_summary": "The project cost is preserved in original nominal dollars from the 2006 annual report, with commissioning expected in 2006/07."
        },
        {
            "field_name": "fixed_opex_per_mw_year_aud",
            "value_text": "Bell Bay Three fixed O&M for 2009-10: $13,000/MW/year.",
            "value_numeric": 13000,
            "unit": "AUD/MW-year",
            "source_url": "https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem",
            "source_title": "Fuel resource, new entry and generation costs in the NEM",
            "publisher": "ACIL Tasman / AEMC-hosted study mirror",
            "published_date": "2009",
            "confidence": "medium",
            "raw_excerpt": "Table 15 Estimated thermal efficiency, auxiliaries and O&M costs for TAS stations ... Bell Bay Three ... FOM ($/MW/year) for 2009-10 13,000 ... VOM ($/MWh sent-out) for 2009-10 7.93.",
            "ai_summary": "Provides a Bell Bay Three-specific fixed O&M assumption for 2009-10. Annual fixed opex for BBTHREE1 is calculated as 40 MW x $13,000/MW-year."
        },
        {
            "field_name": "fixed_opex_annual_aud",
            "value_text": "Calculated from 40 MW capacity and ACIL Tasman 2009-10 FOM of $13,000/MW/year.",
            "value_numeric": 520000,
            "unit": "AUD/year",
            "source_url": "https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem",
            "source_title": "Fuel resource, new entry and generation costs in the NEM",
            "publisher": "ACIL Tasman / AEMC-hosted study mirror",
            "published_date": "2009",
            "confidence": "medium",
            "raw_excerpt": "Bell Bay Three ... FOM ($/MW/year) for 2009-10 13,000.",
            "ai_summary": "Calculated annual FOM for BBTHREE1 only; not a reported plant budget."
        },
        {
            "field_name": "variable_opex_per_mwh_aud",
            "value_text": "Bell Bay Three variable O&M for 2009-10: $7.93/MWh sent-out.",
            "value_numeric": 7.93,
            "unit": "AUD/MWh",
            "source_url": "https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem",
            "source_title": "Fuel resource, new entry and generation costs in the NEM",
            "publisher": "ACIL Tasman / AEMC-hosted study mirror",
            "published_date": "2009",
            "confidence": "medium",
            "raw_excerpt": "Table 15 Estimated thermal efficiency, auxiliaries and O&M costs for TAS stations ... Bell Bay Three ... VOM ($/MWh sent-out) for 2009-10 7.93.",
            "ai_summary": "Bell Bay Three-specific VOM assumption from a market modelling cost review; value is old nominal 2009-10 AUD."
        },
        {
            "field_name": "heat_rate_gj_per_mwh",
            "value_text": "Bell Bay Three static heat rate: 12.04 GJ/MWh; variable heat-rate base 108.79 GJ/h and incremental 9.32 GJ/MWh.",
            "value_numeric": 12.04,
            "unit": "GJ/MWh",
            "source_url": "https://www.aemo.com.au/-/media/files/stakeholder_consultation/consultations/nsp_consultations/2020/aemo-heat-rate-data.pdf",
            "source_title": "AEMO heat rate data",
            "publisher": "AEMO",
            "published_date": "2020",
            "confidence": "high",
            "raw_excerpt": "Heat rates ... Existing generators ... Bell Bay Three | 12.04 | 108.79 | 9.32 ... Static heat rates are used for long term modeling.",
            "ai_summary": "AEMO heat-rate data provides the preferred heat-rate assumption for existing Bell Bay Three units."
        },
        {
            "field_name": "efficiency_pct",
            "value_text": "Calculated HHV efficiency from AEMO static heat rate: 3.6 / 12.04 = 29.9%. Older ACIL Tasman table reported Bell Bay Three thermal efficiency of 29.0% sent-out and 29.7% as-generated.",
            "value_numeric": 29.9,
            "unit": "%",
            "source_url": "https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem",
            "source_title": "Fuel resource, new entry and generation costs in the NEM",
            "publisher": "ACIL Tasman / AEMC-hosted study mirror",
            "published_date": "2009",
            "confidence": "medium",
            "raw_excerpt": "Table 15 ... Bell Bay Three ... Thermal efficiency HHV (%) sent-out 29.0%; Thermal efficiency HHV (GJ/MWh) sent-out 12.41; auxiliaries 2.5%; Thermal efficiency HHV (%) as generated 29.7%; Thermal efficiency HHV (GJ/MWh) as generated 12.10.",
            "ai_summary": "Efficiency is consistent with AEMO's 12.04 GJ/MWh heat-rate assumption and the older ACIL Tasman Bell Bay Three efficiency estimate."
        },
        {
            "field_name": "emissions_intensity_tco2_mwh",
            "value_text": "Bell Bay Three total emissions intensity: 0.71 tCO2-e/MWh sent-out and 0.69 tCO2-e/MWh generated; profile uses generated value 0.69.",
            "value_numeric": 0.69,
            "unit": "tCO2-e/MWh",
            "source_url": "https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem",
            "source_title": "Fuel resource, new entry and generation costs in the NEM",
            "publisher": "ACIL Tasman / AEMC-hosted study mirror",
            "published_date": "2009",
            "confidence": "medium",
            "raw_excerpt": "Table 21 Emission factors and intensity for existing and committed TAS stations ... Bell Bay Three ... Total emission factor 57.1 kg CO2-e/GJ of fuel ... Total emission intensity (tonnes CO2e/MWh sent-out) 0.71 ... generated 0.69.",
            "ai_summary": "Provides a Bell Bay Three-specific total emissions-intensity assumption including fugitive emissions."
        },
        {
            "field_name": "emissions_factor_natural_gas_check",
            "value_text": "National Greenhouse Accounts Factors 2025: natural gas distributed in a pipeline combined Scope 1 emission factor is 51.53 kg CO2-e/GJ.",
            "value_numeric": 51.53,
            "unit": "kgCO2-e/GJ",
            "source_url": "https://www.dcceew.gov.au/sites/default/files/documents/national-greenhouse-account-factors-2025.pdf",
            "source_title": "Australian National Greenhouse Accounts Factors 2025",
            "publisher": "DCCEEW",
            "published_date": "2025",
            "confidence": "high",
            "raw_excerpt": "Fuel combusted Natural gas distributed in a pipeline ... Scope 1 Emission Factor ... Combined gases 51.53 kg CO2-e/GJ.",
            "ai_summary": "Used as a reasonableness check for direct-combustion emissions when combined with heat rate; it excludes upstream fugitives included in ACIL Tasman's total emissions intensity."
        },
        {
            "field_name": "fuel_contract_notes",
            "value_text": "TGP is the only pipeline supplying natural gas to Tasmania, transporting gas from Longford in Victoria to Bell Bay; pipeline supplies Tamar Valley Power Stations.",
            "value_numeric": null,
            "unit": null,
            "source_url": "https://www.tasmaniangaspipeline.com.au/pipeline",
            "source_title": "Pipeline",
            "publisher": "Tasmanian Gas Pipeline",
            "published_date": null,
            "confidence": "high",
            "raw_excerpt": "Commissioned in 2002, the Tasmanian Gas Pipeline (TGP) is the only pipeline supplying natural gas to Tasmania. It transports natural gas from Longford in Victoria, under Bass Strait, to Bell Bay in Tasmania ... The pipeline supplies: Tamar Valley Power Stations.",
            "ai_summary": "Confirms the physical gas supply route and that Tamar Valley/Bell Bay gas generation is supplied via TGP."
        },
        {
            "field_name": "fuel_contract_notes",
            "value_text": "Hydro Tasmania and TGP reached agreement on gas transportation contract terms commencing 1 January 2022.",
            "value_numeric": null,
            "unit": null,
            "source_url": "https://www.hydro.com.au/news/media-releases/2021/12/23/hydro-tasmania-and-tgp-reach-agreement-on-gas-transportation",
            "source_title": "Hydro Tasmania and TGP reach agreement on gas transportation",
            "publisher": "Hydro Tasmania",
            "published_date": "2021-12-23",
            "confidence": "medium",
            "raw_excerpt": "Hydro Tasmania and Tasmanian Gas Pipeline (TGP) have reached agreement on terms for a gas transportation contract commencing on 1 January 2022.",
            "ai_summary": "Public release confirms a gas transportation arrangement, but not the commodity or transport price."
        },
        {
            "field_name": "fuel_contract_notes",
            "value_text": "2007 Hydro report noted a Bell Bay sale agreement and early termination of a gas Pipeline Capacity Agreement; prior to sale agreement the PCA expired in 2018 and carried an annual obligation of $8.5 million.",
            "value_numeric": 8500000,
            "unit": "AUD/year",
            "source_url": "https://www.hydro.com.au/sites/default/files/2026-02/hydro-tasmania-annual-report-2007.pdf",
            "source_title": "Hydro Tasmania Annual Report 2007",
            "publisher": "Hydro Tasmania",
            "published_date": "2007",
            "confidence": "high",
            "raw_excerpt": "The PCA provides the Corporation with committed capacity for gas supplies to the Bell Bay Power Station. Prior to the sale agreement the PCA expired in 2018 and carried an annual obligation of $8.5 million ... renegotiated ... to expire in March 2009.",
            "ai_summary": "Historic pipeline-capacity obligation is relevant to fuel-transport cost context but is not treated as current BBTHREE1 fuel cost."
        },
        {
            "field_name": "asset_life_years",
            "value_text": "Generic OCGT economic life 25 years; technical operational life 40 years.",
            "value_numeric": 25,
            "unit": "years",
            "source_url": "https://aemo.com.au/-/media/files/major-publications/isp/2025/aurecon-2024-energy-technology-costs-and-technical-parameter-review.pdf?la=en",
            "source_title": "2024 Energy Technology Cost and Technical Parameters Review",
            "publisher": "Aurecon for AEMO",
            "published_date": "2024-12-06",
            "confidence": "medium",
            "raw_excerpt": "Open cycle gas turbine ... Economic Life (Design Life) Years 25 25 ... Technical Life (Operational Life) Years 40 40.",
            "ai_summary": "Used as a generic life assumption because no BBTHREE1-specific design-life disclosure was found."
        },
        {
            "field_name": "closure_notes",
            "value_text": "Nemstats reports expected closure year/date as 2025-07-02, but AEMO 2025-26 MLF publication still lists BBTHREE1 as Bell Bay Three No.1 at 110 kV.",
            "value_numeric": 2025,
            "unit": "year",
            "source_url": "https://www.aemo.com.au/-/media/files/electricity/nem/security_and_reliability/loss_factors_and_regional_boundaries/2025-26-marginal-loss-factors/marginal-loss-factors-for-the-2025-26-fin-year.pdf",
            "source_title": "Marginal Loss Factors: Financial Year 2025-26",
            "publisher": "AEMO",
            "published_date": "2025",
            "confidence": "high",
            "raw_excerpt": "Tasmania generation ... Bell Bay Three No.1 ... DUID BBTHREE1 ... Connection Point ID TBB11 ... 2025-26 MLF 0.9986 ... 2024-25 MLF 0.9977.",
            "ai_summary": "Confirms BBTHREE1 remained in AEMO's FY2025-26 MLF tables, creating uncertainty around the expected closure date shown by Nemstats."
        },
        {
            "field_name": "ownership_notes",
            "value_text": "AETV Pty Ltd was transferred to Hydro Tasmania by Ministerial direction at midnight 1 June 2013; Bell Bay Three Pty Ltd and AETV are controlled entities in Hydro Tasmania annual reporting.",
            "value_numeric": 2013,
            "unit": "year",
            "source_url": "https://www.hydro.com.au/sites/default/files/2026-02/hydro-tasmania-annual-report-2024.pdf",
            "source_title": "Hydro Tasmania Annual Report 2024",
            "publisher": "Hydro Tasmania",
            "published_date": "2024",
            "confidence": "high",
            "raw_excerpt": "AETV Pty Ltd was transferred to Hydro Tasmania by Ministerial direction at midnight 1 June 2013 ... Bell Bay Three Pty Ltd was incorporated on 7 December 2005 ... AETV Pty Ltd ... 100%.",
            "ai_summary": "Supports noting Hydro Tasmania group control, while retaining AETV Pty Ltd as the registered owner specified for the DUID."
        }
    ],
    "warnings": [
        "Exact current BBTHREE1 owner-budget fixed O&M, variable O&M, fuel commodity price, gas transport tariff and refurbishment spend were not found in public sources.",
        "Capex is source-backed at the three-unit project level only; BBTHREE1 capex is a pro-rata allocation, not a reported single-unit cost.",
        "O&M assumptions are old 2009-10 nominal modelling values and may not reflect current service-contract costs for aging FT8 units.",
        "Fuel_cost_per_gj_aud is null because accessible AEMO/ACIL material showed charted Bell Bay Three gas-price forecasts but not a reliable tabulated current value in the retrieved text.",
        "Closure status should be reviewed against the latest AEMO Generation Information workbook because public sources found show both a past expected closure date and FY2025-26 AEMO listing."
    ]
}

Full API payload (incl. web search)

{
    "meta": {
        "model": "gpt-5.5",
        "reasoning_effort": "medium",
        "response_id": "resp_0781291f0b3985fe006a20b32584388195ac926928e15f61af",
        "fetched_at": "2026-06-04T09:07:22+10:00"
    },
    "raw_text": "{\"generator_identity\":{\"site_name\":\"Bell Bay Three\",\"duid\":\"BBTHREE1\",\"owner\":\"AETV Pty Ltd\",\"region\":\"TAS1\",\"technology_type\":\"Turbine - OCGT\",\"fuel_type\":\"Fossil - Natural Gas Pipeline\"},\"financial_profile\":{\"generator_type_normalised\":\"ocgt\",\"capex_total_aud\":16666666.67,\"capex_year\":2006,\"capex_basis\":\"estimated\",\"capex_per_mw_aud\":416666.67,\"capex_per_mwh_aud\":null,\"fixed_opex_annual_aud\":520000,\"fixed_opex_per_mw_year_aud\":13000,\"variable_opex_per_mwh_aud\":7.93,\"fuel_cost_per_gj_aud\":null,\"fuel_contract_notes\":\"No public BBTHREE1-specific gas commodity price was found. Public sources indicate Bell Bay Three/Tamar Valley is supplied by the Tasmanian Gas Pipeline from Longford/Gippsland to Bell Bay. Hydro Tasmania has had gas transportation arrangements with TGP, including a 2007 pipeline capacity agreement liability/obligation and a later agreement commencing 1 January 2022. ACIL Allen/AEMO publishes modelled GPG gas price paths for Bell Bay Three in 2025 AUD/GJ, but the chart values are not tabulated in the accessible source text, so no numeric fuel price is populated.\",\"heat_rate_gj_per_mwh\":12.04,\"efficiency_pct\":29.9,\"emissions_intensity_tco2_mwh\":0.69,\"asset_life_years\":25,\"discount_rate_pct\":null,\"source_confidence\":\"medium\",\"data_status\":\"partially_verified\",\"notes\":\"Bell Bay Three consists of three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units. The reported 2006 capex was $50 million for the three-unit Bell Bay Three project, including purchase/installation of gas turbines and associated transmission upgrades; the value entered for BBTHREE1 is a one-third pro-rata allocation and is therefore marked estimated. O&M and heat-rate assumptions are from public modelling sources for Bell Bay Three/OCGT and are not confirmed as current owner budget values. Emissions intensity is taken from an older ACIL Tasman total CO2-e intensity for Bell Bay Three including fugitive emissions; using current NGA 2025 direct-combustion factor only and AEMO static heat rate would imply about 0.62 tCO2-e/MWh generated. Closure information is conflicting/uncertain: Nemstats reports expected closure 2025-07-02, while AEMO 2025-26 MLF documents still list BBTHREE1 as a Tasmanian generator for FY2025-26.\"},\"sources\":[{\"field_name\":\"site_identity_capacity_status\",\"value_text\":\"Owner AETV Pty Ltd; Status In Service; Technology Type Turbine - OCGT; Fuel Type Fossil - Natural Gas Pipeline; DUID BBTHREE1; Capacity 40 MW; Expected Closure Year 2025-07-02.\",\"value_numeric\":40,\"unit\":\"MW\",\"source_url\":\"https://nemstats.com.au/generator.php?short_url=bell-bay-three---turbine---ocgt---bbthree1\",\"source_title\":\"Australian NEM Generators - Bell Bay Three\",\"publisher\":\"Nemstats\",\"published_date\":\"2025\",\"confidence\":\"medium\",\"raw_excerpt\":\"Owner: AETV Pty Ltd; Status: In Service; Technology Type: Turbine - OCGT; Fuel Type: Fossil - Natural Gas Pipeline; DUID: BBTHREE1; Capacity: 40 MW; Expected Closure Year: 2025-07-02.\",\"ai_summary\":\"Confirms the registry identity used for BBTHREE1 and gives the 40 MW capacity and expected closure date shown in the Nemstats mirror of NEM generator data.\"},{\"field_name\":\"site_configuration\",\"value_text\":\"Tamar Valley Power Station has 178 MW of open-cycle gas generation from a 58 MW Rolls Royce Trent 60WLE and 3 x 40 MW Pratt & Whitney FT8 Twin Pac.\",\"value_numeric\":40,\"unit\":\"MW\",\"source_url\":\"https://www.hydro.com.au/our-energy-system/our-power-stations/tamar-valley-power-station\",\"source_title\":\"Tamar Valley Power Station\",\"publisher\":\"Hydro Tasmania\",\"published_date\":null,\"confidence\":\"high\",\"raw_excerpt\":\"The 386 MW station has 208 MW of combined-cycle gas generation (CCGT) from a Mitsubishi M701DA turbine and 178 MW of open-cycle gas generation (OCGT) from a 58 MW Rolls Royce Trent 60WLE and 3 x 40 MW Pratt & Whitney FT8 Twin Pac.\",\"ai_summary\":\"Owner/operator page confirms that the Bell Bay Three units are three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units within the Tamar Valley/Bell Bay gas generation fleet.\"},{\"field_name\":\"capex_total_aud\",\"value_text\":\"Reported Bell Bay Three project cost was $50 million for three 38.75 MVA gas turbine units installed during 2005-06/2006-07; BBTHREE1 capex is estimated as one-third of total.\",\"value_numeric\":16666666.67,\"unit\":\"AUD\",\"source_url\":\"https://www.hydro.com.au/docs/default-source/about-us/our-governance/annual-reports/hydro-tasmania-annual-report-2006.pdf?sfvrsn=fb6e1328_2\",\"source_title\":\"Hydro Tasmania Annual Report 2006\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2006\",\"confidence\":\"high\",\"raw_excerpt\":\"Gas turbines were purchased from the United States and installed during the past year at a total project cost of $50 million. The commissioning of the three 38.75 MVA gas turbine units in 2006/2007 will bring generation capacity to 345 MW. Transmission lines were also upgraded...\",\"ai_summary\":\"Hydro Tasmania reported the Bell Bay Three project cost as $50 million for three units. For this single DUID, a one-third allocation is used.\"},{\"field_name\":\"capex_year\",\"value_text\":\"Installation during 2005-06 with commissioning of the three units in 2006/2007; capex year assigned to 2006 nominal reporting year.\",\"value_numeric\":2006,\"unit\":\"year\",\"source_url\":\"https://www.hydro.com.au/docs/default-source/about-us/our-governance/annual-reports/hydro-tasmania-annual-report-2006.pdf?sfvrsn=fb6e1328_2\",\"source_title\":\"Hydro Tasmania Annual Report 2006\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2006\",\"confidence\":\"high\",\"raw_excerpt\":\"Gas turbines were purchased from the United States and installed during the past year at a total project cost of $50 million. The commissioning of the three 38.75 MVA gas turbine units in 2006/2007...\",\"ai_summary\":\"The project cost is preserved in original nominal dollars from the 2006 annual report, with commissioning expected in 2006/07.\"},{\"field_name\":\"fixed_opex_per_mw_year_aud\",\"value_text\":\"Bell Bay Three fixed O&M for 2009-10: $13,000/MW/year.\",\"value_numeric\":13000,\"unit\":\"AUD/MW-year\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 15 Estimated thermal efficiency, auxiliaries and O&M costs for TAS stations ... Bell Bay Three ... FOM ($/MW/year) for 2009-10 13,000 ... VOM ($/MWh sent-out) for 2009-10 7.93.\",\"ai_summary\":\"Provides a Bell Bay Three-specific fixed O&M assumption for 2009-10. Annual fixed opex for BBTHREE1 is calculated as 40 MW x $13,000/MW-year.\"},{\"field_name\":\"fixed_opex_annual_aud\",\"value_text\":\"Calculated from 40 MW capacity and ACIL Tasman 2009-10 FOM of $13,000/MW/year.\",\"value_numeric\":520000,\"unit\":\"AUD/year\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Bell Bay Three ... FOM ($/MW/year) for 2009-10 13,000.\",\"ai_summary\":\"Calculated annual FOM for BBTHREE1 only; not a reported plant budget.\"},{\"field_name\":\"variable_opex_per_mwh_aud\",\"value_text\":\"Bell Bay Three variable O&M for 2009-10: $7.93/MWh sent-out.\",\"value_numeric\":7.93,\"unit\":\"AUD/MWh\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 15 Estimated thermal efficiency, auxiliaries and O&M costs for TAS stations ... Bell Bay Three ... VOM ($/MWh sent-out) for 2009-10 7.93.\",\"ai_summary\":\"Bell Bay Three-specific VOM assumption from a market modelling cost review; value is old nominal 2009-10 AUD.\"},{\"field_name\":\"heat_rate_gj_per_mwh\",\"value_text\":\"Bell Bay Three static heat rate: 12.04 GJ/MWh; variable heat-rate base 108.79 GJ/h and incremental 9.32 GJ/MWh.\",\"value_numeric\":12.04,\"unit\":\"GJ/MWh\",\"source_url\":\"https://www.aemo.com.au/-/media/files/stakeholder_consultation/consultations/nsp_consultations/2020/aemo-heat-rate-data.pdf\",\"source_title\":\"AEMO heat rate data\",\"publisher\":\"AEMO\",\"published_date\":\"2020\",\"confidence\":\"high\",\"raw_excerpt\":\"Heat rates ... Existing generators ... Bell Bay Three | 12.04 | 108.79 | 9.32 ... Static heat rates are used for long term modeling.\",\"ai_summary\":\"AEMO heat-rate data provides the preferred heat-rate assumption for existing Bell Bay Three units.\"},{\"field_name\":\"efficiency_pct\",\"value_text\":\"Calculated HHV efficiency from AEMO static heat rate: 3.6 / 12.04 = 29.9%. Older ACIL Tasman table reported Bell Bay Three thermal efficiency of 29.0% sent-out and 29.7% as-generated.\",\"value_numeric\":29.9,\"unit\":\"%\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 15 ... Bell Bay Three ... Thermal efficiency HHV (%) sent-out 29.0%; Thermal efficiency HHV (GJ/MWh) sent-out 12.41; auxiliaries 2.5%; Thermal efficiency HHV (%) as generated 29.7%; Thermal efficiency HHV (GJ/MWh) as generated 12.10.\",\"ai_summary\":\"Efficiency is consistent with AEMO's 12.04 GJ/MWh heat-rate assumption and the older ACIL Tasman Bell Bay Three efficiency estimate.\"},{\"field_name\":\"emissions_intensity_tco2_mwh\",\"value_text\":\"Bell Bay Three total emissions intensity: 0.71 tCO2-e/MWh sent-out and 0.69 tCO2-e/MWh generated; profile uses generated value 0.69.\",\"value_numeric\":0.69,\"unit\":\"tCO2-e/MWh\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 21 Emission factors and intensity for existing and committed TAS stations ... Bell Bay Three ... Total emission factor 57.1 kg CO2-e/GJ of fuel ... Total emission intensity (tonnes CO2e/MWh sent-out) 0.71 ... generated 0.69.\",\"ai_summary\":\"Provides a Bell Bay Three-specific total emissions-intensity assumption including fugitive emissions.\"},{\"field_name\":\"emissions_factor_natural_gas_check\",\"value_text\":\"National Greenhouse Accounts Factors 2025: natural gas distributed in a pipeline combined Scope 1 emission factor is 51.53 kg CO2-e/GJ.\",\"value_numeric\":51.53,\"unit\":\"kgCO2-e/GJ\",\"source_url\":\"https://www.dcceew.gov.au/sites/default/files/documents/national-greenhouse-account-factors-2025.pdf\",\"source_title\":\"Australian National Greenhouse Accounts Factors 2025\",\"publisher\":\"DCCEEW\",\"published_date\":\"2025\",\"confidence\":\"high\",\"raw_excerpt\":\"Fuel combusted Natural gas distributed in a pipeline ... Scope 1 Emission Factor ... Combined gases 51.53 kg CO2-e/GJ.\",\"ai_summary\":\"Used as a reasonableness check for direct-combustion emissions when combined with heat rate; it excludes upstream fugitives included in ACIL Tasman's total emissions intensity.\"},{\"field_name\":\"fuel_contract_notes\",\"value_text\":\"TGP is the only pipeline supplying natural gas to Tasmania, transporting gas from Longford in Victoria to Bell Bay; pipeline supplies Tamar Valley Power Stations.\",\"value_numeric\":null,\"unit\":null,\"source_url\":\"https://www.tasmaniangaspipeline.com.au/pipeline\",\"source_title\":\"Pipeline\",\"publisher\":\"Tasmanian Gas Pipeline\",\"published_date\":null,\"confidence\":\"high\",\"raw_excerpt\":\"Commissioned in 2002, the Tasmanian Gas Pipeline (TGP) is the only pipeline supplying natural gas to Tasmania. It transports natural gas from Longford in Victoria, under Bass Strait, to Bell Bay in Tasmania ... The pipeline supplies: Tamar Valley Power Stations.\",\"ai_summary\":\"Confirms the physical gas supply route and that Tamar Valley/Bell Bay gas generation is supplied via TGP.\"},{\"field_name\":\"fuel_contract_notes\",\"value_text\":\"Hydro Tasmania and TGP reached agreement on gas transportation contract terms commencing 1 January 2022.\",\"value_numeric\":null,\"unit\":null,\"source_url\":\"https://www.hydro.com.au/news/media-releases/2021/12/23/hydro-tasmania-and-tgp-reach-agreement-on-gas-transportation\",\"source_title\":\"Hydro Tasmania and TGP reach agreement on gas transportation\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2021-12-23\",\"confidence\":\"medium\",\"raw_excerpt\":\"Hydro Tasmania and Tasmanian Gas Pipeline (TGP) have reached agreement on terms for a gas transportation contract commencing on 1 January 2022.\",\"ai_summary\":\"Public release confirms a gas transportation arrangement, but not the commodity or transport price.\"},{\"field_name\":\"fuel_contract_notes\",\"value_text\":\"2007 Hydro report noted a Bell Bay sale agreement and early termination of a gas Pipeline Capacity Agreement; prior to sale agreement the PCA expired in 2018 and carried an annual obligation of $8.5 million.\",\"value_numeric\":8500000,\"unit\":\"AUD/year\",\"source_url\":\"https://www.hydro.com.au/sites/default/files/2026-02/hydro-tasmania-annual-report-2007.pdf\",\"source_title\":\"Hydro Tasmania Annual Report 2007\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2007\",\"confidence\":\"high\",\"raw_excerpt\":\"The PCA provides the Corporation with committed capacity for gas supplies to the Bell Bay Power Station. Prior to the sale agreement the PCA expired in 2018 and carried an annual obligation of $8.5 million ... renegotiated ... to expire in March 2009.\",\"ai_summary\":\"Historic pipeline-capacity obligation is relevant to fuel-transport cost context but is not treated as current BBTHREE1 fuel cost.\"},{\"field_name\":\"asset_life_years\",\"value_text\":\"Generic OCGT economic life 25 years; technical operational life 40 years.\",\"value_numeric\":25,\"unit\":\"years\",\"source_url\":\"https://aemo.com.au/-/media/files/major-publications/isp/2025/aurecon-2024-energy-technology-costs-and-technical-parameter-review.pdf?la=en\",\"source_title\":\"2024 Energy Technology Cost and Technical Parameters Review\",\"publisher\":\"Aurecon for AEMO\",\"published_date\":\"2024-12-06\",\"confidence\":\"medium\",\"raw_excerpt\":\"Open cycle gas turbine ... Economic Life (Design Life) Years 25 25 ... Technical Life (Operational Life) Years 40 40.\",\"ai_summary\":\"Used as a generic life assumption because no BBTHREE1-specific design-life disclosure was found.\"},{\"field_name\":\"closure_notes\",\"value_text\":\"Nemstats reports expected closure year/date as 2025-07-02, but AEMO 2025-26 MLF publication still lists BBTHREE1 as Bell Bay Three No.1 at 110 kV.\",\"value_numeric\":2025,\"unit\":\"year\",\"source_url\":\"https://www.aemo.com.au/-/media/files/electricity/nem/security_and_reliability/loss_factors_and_regional_boundaries/2025-26-marginal-loss-factors/marginal-loss-factors-for-the-2025-26-fin-year.pdf\",\"source_title\":\"Marginal Loss Factors: Financial Year 2025-26\",\"publisher\":\"AEMO\",\"published_date\":\"2025\",\"confidence\":\"high\",\"raw_excerpt\":\"Tasmania generation ... Bell Bay Three No.1 ... DUID BBTHREE1 ... Connection Point ID TBB11 ... 2025-26 MLF 0.9986 ... 2024-25 MLF 0.9977.\",\"ai_summary\":\"Confirms BBTHREE1 remained in AEMO's FY2025-26 MLF tables, creating uncertainty around the expected closure date shown by Nemstats.\"},{\"field_name\":\"ownership_notes\",\"value_text\":\"AETV Pty Ltd was transferred to Hydro Tasmania by Ministerial direction at midnight 1 June 2013; Bell Bay Three Pty Ltd and AETV are controlled entities in Hydro Tasmania annual reporting.\",\"value_numeric\":2013,\"unit\":\"year\",\"source_url\":\"https://www.hydro.com.au/sites/default/files/2026-02/hydro-tasmania-annual-report-2024.pdf\",\"source_title\":\"Hydro Tasmania Annual Report 2024\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2024\",\"confidence\":\"high\",\"raw_excerpt\":\"AETV Pty Ltd was transferred to Hydro Tasmania by Ministerial direction at midnight 1 June 2013 ... Bell Bay Three Pty Ltd was incorporated on 7 December 2005 ... AETV Pty Ltd ... 100%.\",\"ai_summary\":\"Supports noting Hydro Tasmania group control, while retaining AETV Pty Ltd as the registered owner specified for the DUID.\"}],\"warnings\":[\"Exact current BBTHREE1 owner-budget fixed O&M, variable O&M, fuel commodity price, gas transport tariff and refurbishment spend were not found in public sources.\",\"Capex is source-backed at the three-unit project level only; BBTHREE1 capex is a pro-rata allocation, not a reported single-unit cost.\",\"O&M assumptions are old 2009-10 nominal modelling values and may not reflect current service-contract costs for aging FT8 units.\",\"Fuel_cost_per_gj_aud is null because accessible AEMO/ACIL material showed charted Bell Bay Three gas-price forecasts but not a reliable tabulated current value in the retrieved text.\",\"Closure status should be reviewed against the latest AEMO Generation Information workbook because public sources found show both a past expected closure date and FY2025-26 AEMO listing.\"]}",
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                        "text": "{\"generator_identity\":{\"site_name\":\"Bell Bay Three\",\"duid\":\"BBTHREE1\",\"owner\":\"AETV Pty Ltd\",\"region\":\"TAS1\",\"technology_type\":\"Turbine - OCGT\",\"fuel_type\":\"Fossil - Natural Gas Pipeline\"},\"financial_profile\":{\"generator_type_normalised\":\"ocgt\",\"capex_total_aud\":16666666.67,\"capex_year\":2006,\"capex_basis\":\"estimated\",\"capex_per_mw_aud\":416666.67,\"capex_per_mwh_aud\":null,\"fixed_opex_annual_aud\":520000,\"fixed_opex_per_mw_year_aud\":13000,\"variable_opex_per_mwh_aud\":7.93,\"fuel_cost_per_gj_aud\":null,\"fuel_contract_notes\":\"No public BBTHREE1-specific gas commodity price was found. Public sources indicate Bell Bay Three/Tamar Valley is supplied by the Tasmanian Gas Pipeline from Longford/Gippsland to Bell Bay. Hydro Tasmania has had gas transportation arrangements with TGP, including a 2007 pipeline capacity agreement liability/obligation and a later agreement commencing 1 January 2022. ACIL Allen/AEMO publishes modelled GPG gas price paths for Bell Bay Three in 2025 AUD/GJ, but the chart values are not tabulated in the accessible source text, so no numeric fuel price is populated.\",\"heat_rate_gj_per_mwh\":12.04,\"efficiency_pct\":29.9,\"emissions_intensity_tco2_mwh\":0.69,\"asset_life_years\":25,\"discount_rate_pct\":null,\"source_confidence\":\"medium\",\"data_status\":\"partially_verified\",\"notes\":\"Bell Bay Three consists of three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units. The reported 2006 capex was $50 million for the three-unit Bell Bay Three project, including purchase/installation of gas turbines and associated transmission upgrades; the value entered for BBTHREE1 is a one-third pro-rata allocation and is therefore marked estimated. O&M and heat-rate assumptions are from public modelling sources for Bell Bay Three/OCGT and are not confirmed as current owner budget values. Emissions intensity is taken from an older ACIL Tasman total CO2-e intensity for Bell Bay Three including fugitive emissions; using current NGA 2025 direct-combustion factor only and AEMO static heat rate would imply about 0.62 tCO2-e/MWh generated. Closure information is conflicting/uncertain: Nemstats reports expected closure 2025-07-02, while AEMO 2025-26 MLF documents still list BBTHREE1 as a Tasmanian generator for FY2025-26.\"},\"sources\":[{\"field_name\":\"site_identity_capacity_status\",\"value_text\":\"Owner AETV Pty Ltd; Status In Service; Technology Type Turbine - OCGT; Fuel Type Fossil - Natural Gas Pipeline; DUID BBTHREE1; Capacity 40 MW; Expected Closure Year 2025-07-02.\",\"value_numeric\":40,\"unit\":\"MW\",\"source_url\":\"https://nemstats.com.au/generator.php?short_url=bell-bay-three---turbine---ocgt---bbthree1\",\"source_title\":\"Australian NEM Generators - Bell Bay Three\",\"publisher\":\"Nemstats\",\"published_date\":\"2025\",\"confidence\":\"medium\",\"raw_excerpt\":\"Owner: AETV Pty Ltd; Status: In Service; Technology Type: Turbine - OCGT; Fuel Type: Fossil - Natural Gas Pipeline; DUID: BBTHREE1; Capacity: 40 MW; Expected Closure Year: 2025-07-02.\",\"ai_summary\":\"Confirms the registry identity used for BBTHREE1 and gives the 40 MW capacity and expected closure date shown in the Nemstats mirror of NEM generator data.\"},{\"field_name\":\"site_configuration\",\"value_text\":\"Tamar Valley Power Station has 178 MW of open-cycle gas generation from a 58 MW Rolls Royce Trent 60WLE and 3 x 40 MW Pratt & Whitney FT8 Twin Pac.\",\"value_numeric\":40,\"unit\":\"MW\",\"source_url\":\"https://www.hydro.com.au/our-energy-system/our-power-stations/tamar-valley-power-station\",\"source_title\":\"Tamar Valley Power Station\",\"publisher\":\"Hydro Tasmania\",\"published_date\":null,\"confidence\":\"high\",\"raw_excerpt\":\"The 386 MW station has 208 MW of combined-cycle gas generation (CCGT) from a Mitsubishi M701DA turbine and 178 MW of open-cycle gas generation (OCGT) from a 58 MW Rolls Royce Trent 60WLE and 3 x 40 MW Pratt & Whitney FT8 Twin Pac.\",\"ai_summary\":\"Owner/operator page confirms that the Bell Bay Three units are three 40 MW Pratt & Whitney FT8 Twin Pac OCGT units within the Tamar Valley/Bell Bay gas generation fleet.\"},{\"field_name\":\"capex_total_aud\",\"value_text\":\"Reported Bell Bay Three project cost was $50 million for three 38.75 MVA gas turbine units installed during 2005-06/2006-07; BBTHREE1 capex is estimated as one-third of total.\",\"value_numeric\":16666666.67,\"unit\":\"AUD\",\"source_url\":\"https://www.hydro.com.au/docs/default-source/about-us/our-governance/annual-reports/hydro-tasmania-annual-report-2006.pdf?sfvrsn=fb6e1328_2\",\"source_title\":\"Hydro Tasmania Annual Report 2006\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2006\",\"confidence\":\"high\",\"raw_excerpt\":\"Gas turbines were purchased from the United States and installed during the past year at a total project cost of $50 million. The commissioning of the three 38.75 MVA gas turbine units in 2006/2007 will bring generation capacity to 345 MW. Transmission lines were also upgraded...\",\"ai_summary\":\"Hydro Tasmania reported the Bell Bay Three project cost as $50 million for three units. For this single DUID, a one-third allocation is used.\"},{\"field_name\":\"capex_year\",\"value_text\":\"Installation during 2005-06 with commissioning of the three units in 2006/2007; capex year assigned to 2006 nominal reporting year.\",\"value_numeric\":2006,\"unit\":\"year\",\"source_url\":\"https://www.hydro.com.au/docs/default-source/about-us/our-governance/annual-reports/hydro-tasmania-annual-report-2006.pdf?sfvrsn=fb6e1328_2\",\"source_title\":\"Hydro Tasmania Annual Report 2006\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2006\",\"confidence\":\"high\",\"raw_excerpt\":\"Gas turbines were purchased from the United States and installed during the past year at a total project cost of $50 million. The commissioning of the three 38.75 MVA gas turbine units in 2006/2007...\",\"ai_summary\":\"The project cost is preserved in original nominal dollars from the 2006 annual report, with commissioning expected in 2006/07.\"},{\"field_name\":\"fixed_opex_per_mw_year_aud\",\"value_text\":\"Bell Bay Three fixed O&M for 2009-10: $13,000/MW/year.\",\"value_numeric\":13000,\"unit\":\"AUD/MW-year\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 15 Estimated thermal efficiency, auxiliaries and O&M costs for TAS stations ... Bell Bay Three ... FOM ($/MW/year) for 2009-10 13,000 ... VOM ($/MWh sent-out) for 2009-10 7.93.\",\"ai_summary\":\"Provides a Bell Bay Three-specific fixed O&M assumption for 2009-10. Annual fixed opex for BBTHREE1 is calculated as 40 MW x $13,000/MW-year.\"},{\"field_name\":\"fixed_opex_annual_aud\",\"value_text\":\"Calculated from 40 MW capacity and ACIL Tasman 2009-10 FOM of $13,000/MW/year.\",\"value_numeric\":520000,\"unit\":\"AUD/year\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Bell Bay Three ... FOM ($/MW/year) for 2009-10 13,000.\",\"ai_summary\":\"Calculated annual FOM for BBTHREE1 only; not a reported plant budget.\"},{\"field_name\":\"variable_opex_per_mwh_aud\",\"value_text\":\"Bell Bay Three variable O&M for 2009-10: $7.93/MWh sent-out.\",\"value_numeric\":7.93,\"unit\":\"AUD/MWh\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 15 Estimated thermal efficiency, auxiliaries and O&M costs for TAS stations ... Bell Bay Three ... VOM ($/MWh sent-out) for 2009-10 7.93.\",\"ai_summary\":\"Bell Bay Three-specific VOM assumption from a market modelling cost review; value is old nominal 2009-10 AUD.\"},{\"field_name\":\"heat_rate_gj_per_mwh\",\"value_text\":\"Bell Bay Three static heat rate: 12.04 GJ/MWh; variable heat-rate base 108.79 GJ/h and incremental 9.32 GJ/MWh.\",\"value_numeric\":12.04,\"unit\":\"GJ/MWh\",\"source_url\":\"https://www.aemo.com.au/-/media/files/stakeholder_consultation/consultations/nsp_consultations/2020/aemo-heat-rate-data.pdf\",\"source_title\":\"AEMO heat rate data\",\"publisher\":\"AEMO\",\"published_date\":\"2020\",\"confidence\":\"high\",\"raw_excerpt\":\"Heat rates ... Existing generators ... Bell Bay Three | 12.04 | 108.79 | 9.32 ... Static heat rates are used for long term modeling.\",\"ai_summary\":\"AEMO heat-rate data provides the preferred heat-rate assumption for existing Bell Bay Three units.\"},{\"field_name\":\"efficiency_pct\",\"value_text\":\"Calculated HHV efficiency from AEMO static heat rate: 3.6 / 12.04 = 29.9%. Older ACIL Tasman table reported Bell Bay Three thermal efficiency of 29.0% sent-out and 29.7% as-generated.\",\"value_numeric\":29.9,\"unit\":\"%\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 15 ... Bell Bay Three ... Thermal efficiency HHV (%) sent-out 29.0%; Thermal efficiency HHV (GJ/MWh) sent-out 12.41; auxiliaries 2.5%; Thermal efficiency HHV (%) as generated 29.7%; Thermal efficiency HHV (GJ/MWh) as generated 12.10.\",\"ai_summary\":\"Efficiency is consistent with AEMO's 12.04 GJ/MWh heat-rate assumption and the older ACIL Tasman Bell Bay Three efficiency estimate.\"},{\"field_name\":\"emissions_intensity_tco2_mwh\",\"value_text\":\"Bell Bay Three total emissions intensity: 0.71 tCO2-e/MWh sent-out and 0.69 tCO2-e/MWh generated; profile uses generated value 0.69.\",\"value_numeric\":0.69,\"unit\":\"tCO2-e/MWh\",\"source_url\":\"https://paperzz.com/doc/7053494/fuel-resource--new-entry-and-generation-costs-in-the-nem\",\"source_title\":\"Fuel resource, new entry and generation costs in the NEM\",\"publisher\":\"ACIL Tasman / AEMC-hosted study mirror\",\"published_date\":\"2009\",\"confidence\":\"medium\",\"raw_excerpt\":\"Table 21 Emission factors and intensity for existing and committed TAS stations ... Bell Bay Three ... Total emission factor 57.1 kg CO2-e/GJ of fuel ... Total emission intensity (tonnes CO2e/MWh sent-out) 0.71 ... generated 0.69.\",\"ai_summary\":\"Provides a Bell Bay Three-specific total emissions-intensity assumption including fugitive emissions.\"},{\"field_name\":\"emissions_factor_natural_gas_check\",\"value_text\":\"National Greenhouse Accounts Factors 2025: natural gas distributed in a pipeline combined Scope 1 emission factor is 51.53 kg CO2-e/GJ.\",\"value_numeric\":51.53,\"unit\":\"kgCO2-e/GJ\",\"source_url\":\"https://www.dcceew.gov.au/sites/default/files/documents/national-greenhouse-account-factors-2025.pdf\",\"source_title\":\"Australian National Greenhouse Accounts Factors 2025\",\"publisher\":\"DCCEEW\",\"published_date\":\"2025\",\"confidence\":\"high\",\"raw_excerpt\":\"Fuel combusted Natural gas distributed in a pipeline ... Scope 1 Emission Factor ... Combined gases 51.53 kg CO2-e/GJ.\",\"ai_summary\":\"Used as a reasonableness check for direct-combustion emissions when combined with heat rate; it excludes upstream fugitives included in ACIL Tasman's total emissions intensity.\"},{\"field_name\":\"fuel_contract_notes\",\"value_text\":\"TGP is the only pipeline supplying natural gas to Tasmania, transporting gas from Longford in Victoria to Bell Bay; pipeline supplies Tamar Valley Power Stations.\",\"value_numeric\":null,\"unit\":null,\"source_url\":\"https://www.tasmaniangaspipeline.com.au/pipeline\",\"source_title\":\"Pipeline\",\"publisher\":\"Tasmanian Gas Pipeline\",\"published_date\":null,\"confidence\":\"high\",\"raw_excerpt\":\"Commissioned in 2002, the Tasmanian Gas Pipeline (TGP) is the only pipeline supplying natural gas to Tasmania. It transports natural gas from Longford in Victoria, under Bass Strait, to Bell Bay in Tasmania ... The pipeline supplies: Tamar Valley Power Stations.\",\"ai_summary\":\"Confirms the physical gas supply route and that Tamar Valley/Bell Bay gas generation is supplied via TGP.\"},{\"field_name\":\"fuel_contract_notes\",\"value_text\":\"Hydro Tasmania and TGP reached agreement on gas transportation contract terms commencing 1 January 2022.\",\"value_numeric\":null,\"unit\":null,\"source_url\":\"https://www.hydro.com.au/news/media-releases/2021/12/23/hydro-tasmania-and-tgp-reach-agreement-on-gas-transportation\",\"source_title\":\"Hydro Tasmania and TGP reach agreement on gas transportation\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2021-12-23\",\"confidence\":\"medium\",\"raw_excerpt\":\"Hydro Tasmania and Tasmanian Gas Pipeline (TGP) have reached agreement on terms for a gas transportation contract commencing on 1 January 2022.\",\"ai_summary\":\"Public release confirms a gas transportation arrangement, but not the commodity or transport price.\"},{\"field_name\":\"fuel_contract_notes\",\"value_text\":\"2007 Hydro report noted a Bell Bay sale agreement and early termination of a gas Pipeline Capacity Agreement; prior to sale agreement the PCA expired in 2018 and carried an annual obligation of $8.5 million.\",\"value_numeric\":8500000,\"unit\":\"AUD/year\",\"source_url\":\"https://www.hydro.com.au/sites/default/files/2026-02/hydro-tasmania-annual-report-2007.pdf\",\"source_title\":\"Hydro Tasmania Annual Report 2007\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2007\",\"confidence\":\"high\",\"raw_excerpt\":\"The PCA provides the Corporation with committed capacity for gas supplies to the Bell Bay Power Station. Prior to the sale agreement the PCA expired in 2018 and carried an annual obligation of $8.5 million ... renegotiated ... to expire in March 2009.\",\"ai_summary\":\"Historic pipeline-capacity obligation is relevant to fuel-transport cost context but is not treated as current BBTHREE1 fuel cost.\"},{\"field_name\":\"asset_life_years\",\"value_text\":\"Generic OCGT economic life 25 years; technical operational life 40 years.\",\"value_numeric\":25,\"unit\":\"years\",\"source_url\":\"https://aemo.com.au/-/media/files/major-publications/isp/2025/aurecon-2024-energy-technology-costs-and-technical-parameter-review.pdf?la=en\",\"source_title\":\"2024 Energy Technology Cost and Technical Parameters Review\",\"publisher\":\"Aurecon for AEMO\",\"published_date\":\"2024-12-06\",\"confidence\":\"medium\",\"raw_excerpt\":\"Open cycle gas turbine ... Economic Life (Design Life) Years 25 25 ... Technical Life (Operational Life) Years 40 40.\",\"ai_summary\":\"Used as a generic life assumption because no BBTHREE1-specific design-life disclosure was found.\"},{\"field_name\":\"closure_notes\",\"value_text\":\"Nemstats reports expected closure year/date as 2025-07-02, but AEMO 2025-26 MLF publication still lists BBTHREE1 as Bell Bay Three No.1 at 110 kV.\",\"value_numeric\":2025,\"unit\":\"year\",\"source_url\":\"https://www.aemo.com.au/-/media/files/electricity/nem/security_and_reliability/loss_factors_and_regional_boundaries/2025-26-marginal-loss-factors/marginal-loss-factors-for-the-2025-26-fin-year.pdf\",\"source_title\":\"Marginal Loss Factors: Financial Year 2025-26\",\"publisher\":\"AEMO\",\"published_date\":\"2025\",\"confidence\":\"high\",\"raw_excerpt\":\"Tasmania generation ... Bell Bay Three No.1 ... DUID BBTHREE1 ... Connection Point ID TBB11 ... 2025-26 MLF 0.9986 ... 2024-25 MLF 0.9977.\",\"ai_summary\":\"Confirms BBTHREE1 remained in AEMO's FY2025-26 MLF tables, creating uncertainty around the expected closure date shown by Nemstats.\"},{\"field_name\":\"ownership_notes\",\"value_text\":\"AETV Pty Ltd was transferred to Hydro Tasmania by Ministerial direction at midnight 1 June 2013; Bell Bay Three Pty Ltd and AETV are controlled entities in Hydro Tasmania annual reporting.\",\"value_numeric\":2013,\"unit\":\"year\",\"source_url\":\"https://www.hydro.com.au/sites/default/files/2026-02/hydro-tasmania-annual-report-2024.pdf\",\"source_title\":\"Hydro Tasmania Annual Report 2024\",\"publisher\":\"Hydro Tasmania\",\"published_date\":\"2024\",\"confidence\":\"high\",\"raw_excerpt\":\"AETV Pty Ltd was transferred to Hydro Tasmania by Ministerial direction at midnight 1 June 2013 ... Bell Bay Three Pty Ltd was incorporated on 7 December 2005 ... AETV Pty Ltd ... 100%.\",\"ai_summary\":\"Supports noting Hydro Tasmania group control, while retaining AETV Pty Ltd as the registered owner specified for the DUID.\"}],\"warnings\":[\"Exact current BBTHREE1 owner-budget fixed O&M, variable O&M, fuel commodity price, gas transport tariff and refurbishment spend were not found in public sources.\",\"Capex is source-backed at the three-unit project level only; BBTHREE1 capex is a pro-rata allocation, not a reported single-unit cost.\",\"O&M assumptions are old 2009-10 nominal modelling values and may not reflect current service-contract costs for aging FT8 units.\",\"Fuel_cost_per_gj_aud is null because accessible AEMO/ACIL material showed charted Bell Bay Three gas-price forecasts but not a reliable tabulated current value in the retrieved text.\",\"Closure status should be reviewed against the latest AEMO Generation Information workbook because public sources found show both a past expected closure date and FY2025-26 AEMO listing.\"]}"
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Bell Bay Three

Dispatch & revenue

Energy flow

Revenue (× MLF)

Methodology & assumptions

Financial overview

Sources

Last AI response