Dispatch target (cleared) vs availability — 5‑minute intervals. TAS1 regional price (RRP) on right axis.
03 Jun 2026 22:15 → 04 Jun 2026 22:15 AEST
Estimated $ per interval using regional RRP and MLF effective on each day.
UNIT_SOLUTION (5‑minute intervals). Intervention intervals excluded.dispatch_price RRP matched by settlement time and NEM region (from generator registry).| Effective from | MLF |
|---|---|
| 2024-07-01 | 0.9977 |
| 2025-07-01 | 0.9986 |
| Capex total (greenfield) |
$17.47M
Shown in table How this was derived Reference |
|---|---|
| Capex refurbishment |
—
|
| Capex / MW derived |
$436,742
Shown in table How this was derived Reference |
| Fixed OPEX (annual) |
$694.7k
Shown in table How this was derived Reference |
| Fixed OPEX / MW-yr |
$17,368
Shown in table How this was derived Reference |
| Variable OPEX / MWh |
$16.10
Shown in table How this was derived Reference |
| Fuel cost / GJ |
$10.06
Shown in table How this was derived Reference |
| Heat rate GJ/MWh |
12.04
Shown in table How this was derived Reference |
Confidence: medium · Status: ai estimated · Capex basis: estimated · AI checked 04 Jun 2026
Notes
No specific financial and operating data available for Bell Bay Three. Information may need to be estimated based on OCGT technology defaults.
Bell Bay Three comprises three gas turbine units. The reported construction/project cost found is for all three 38.75 MVA gas turbine units installed by Bell Bay Three Pty Ltd in 2005-06 at A$52.409 million; the capex_total_aud shown for BBTHREE2 is a one-third allocation of that reported total and uses the user-supplied 40 MW capacity for per-MW calculation. O&M, asset-life and generic max-load heat-rate/efficiency assumptions are based on AEMO/Aurecon/GHD small OCGT or AEMO existing-generator assumptions, not BBTHREE2 owner-reported accounts. AEMO heat-rate data gives Bell Bay Three static heat rate 12.04 GJ/MWh HHV and variable heat-rate parameters of 108.79 GJ/h base and 9.32 GJ/MWh incremental. Emissions intensity is calculated as 12.04 GJ/MWh multiplied by 51.53 kgCO2-e/GJ for natural gas distributed in a pipeline. AEMO/AEMC material indicates Bell Bay Three had an announced withdrawal intention around 2015 that was later rescinded; AEMO 2025-26 marginal-loss-factor data still lists BBTHREE2 at the Bell Bay Three No.2 connection point. No unit-specific major refurbishment cost was found.
Bell Bay Three is part of Hydro Tasmania's Tamar Valley Power Station complex. Hydro Tasmania identifies the OCGT fleet as 3 x 40 MW Pratt & Whitney FT8 Twin Pac units plus a 58 MW Rolls Royce Trent. Exact original construction/purchase capex for BBTHREE2 was not found; the available official 2016 background document says the three FT8 units were originally purchased by Hydro Tasmania for energy supply mitigation before Basslink, were second-hand, and were approaching end of life. Capex, fixed O&M, variable O&M, heat rate, efficiency and asset life are therefore default estimates using AEMO/Aurecon 2024 small OCGT assumptions, scaled to the 40 MW DUID. Emissions intensity is calculated as 9.373 GJ/MWh LHV heat rate multiplied by 51.53 kg CO2-e/GJ natural gas Scope 1 factor. AER operating notes indicate intermittent/sparing OCGT operation, ongoing NOx investigations on Pratt & Whitney units, and a February 2025 NOx exceedance on Unit 102B; BBTHREE2 is inferred to correspond to the second FT8 Twin Pac/Unit 102, but this unit mapping should be verified with plant records.
BBTHREE2 is one of three Pratt & Whitney FT8 Twin Pac OCGT units at Tamar Valley / Bell Bay Three. Official owner material confirms 3 x 40 MW FT8 Twin Pac OCGT within the 386 MW Tamar Valley Power Station. Exact original 2006 construction/acquisition cost for BBTHREE2 was not found. The capex value is a pro-rata allocation of a reported March 2007 AUD 75 million Alinta purchase of the 105 MW Bell Bay peaking plant site, which included gas pipeline capacity agreements; it is therefore not a pure construction cost and is marked estimated. Fixed O&M is a generic OCGT assumption from ACIL Tasman/QCA, applied to 40 MW. Variable O&M, fuel cost, thermal efficiency and emissions intensity are Bell Bay Three-specific modelling assumptions from ACIL Tasman 2009/2010. Heat rate is AEMO-specific for Bell Bay Three. Hydro Tasmania annual reporting notes site rehabilitation provisions for demolition/remediation of Bell Bay plant and Tamar Valley Power Station at end of useful life, but no BBTHREE2 closure year was found in the searched public sources.
Bell Bay Three comprises the three pre-existing Pratt & Whitney FT8 Twin Pac OCGT units at Tamar Valley Power Station. BBTHREE2 is treated as one 40 MW FT8 unit; exact mapping to the AER equipment labels is inferred as Unit 102/Unit 102A-102B. No source-backed original construction cost for BBTHREE2 was found. The capex value used is an estimated one-third allocation of the reported 2007 Alinta purchase of the Bell Bay site and three gas turbines for A$75 million; this is an acquisition/value allocation including site and gas pipeline capacity agreements, not a pure construction EPC cost. Fixed and variable O&M, heat rate, efficiency, capex replacement benchmarks and asset life are technology defaults from the Aurecon 2024 Energy Technology Cost and Parameters Review for AEMO, using the small aero-derivative OCGT case. Emissions intensity is calculated as heat rate 9.373 GJ/MWh multiplied by the 2025 NGA Factors natural gas pipeline Scope 1 combined-gases factor of 51.53 kg CO2-e/GJ. Major operating notes: 2023-24 AER states Unit 102A and Unit 102B were tested; Units 101 and 102 were used sparingly; a late-June 2024 lightning strike damaged all units. Unit 103A was not operational and Unit 103B had been out of service since 2018, which affects the wider Bell Bay Three station but not necessarily BBTHREE2 directly.
Bell Bay Three BBTHREE2 is one of three Pratt & Whitney FT8 Twin Pac OCGT units. Generator-specific capex was not found; the profile uses a pro-rata allocation of Hydro Tasmania's reported A$50 million total project cost for three 38.75 MVA gas turbine units installed in 2005-06 and commissioned in 2006-07, divided by three and by 40 MW. Fixed and variable O&M are technology estimates from AEMO/Aurecon 2024 small aero-derivative OCGT parameters, not site-reported costs. Heat rate and efficiency use Mitsubishi Power FT8 SWIFTPAC public performance data for the same FT8 twin-engine aero-derivative package. Emissions intensity is calculated as heat rate 9.9 GJ/MWh multiplied by the Australian NGA 2025 stationary-combustion natural gas scope 1 factor of 51.53 kg CO2-e/GJ. No reliable public fuel price for Bell Bay Three was found. Closure/refurbishment: the original Bell Bay station ceased operations in 2009, but the three Bell Bay Three OCGTs became part of Tamar Valley Power Station; Hydro Tasmania stated in 2017 that the four open-cycle gas turbines at Tamar Valley would continue to provide peak supply. A 2025 Hydro Tasmania annual report excerpt indicates site rehabilitation provisioning for Bell Bay plant and Tamar Valley Power Station at end of useful life. A third-party NEMStats result listed an expected closure date of 2025-07-02 while also listing the unit in service; this was treated as a warning rather than relied on because AEMO 2025-26 MLF documents still list BBTHREE2.