Marian Mill power station is a 18 MW biomass power plant in Queensland, Australia. It is operated by Mackay Sugar Ltd. Based on its capacity (estimated), it can supply roughly 24,778 homes (estimated). It ranks #329 of 512 Australia power plants by installed capacity. In context, biomass supplies about 1.1% of Australia's electricity; the national grid averages 525 gCO₂/kWh (38.6% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id CT-6207.
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Operated by Mackay Sugar Ltd. All plants by this company →
This biomass plant burns organic material (wood, residues) to raise steam for a turbine. It sits in a humid subtropical (dry winter) climate (Köppen Cwa) — Southern Hemisphere, latitude 21.1°S — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 99% below the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.
Climate heat-demand index: 13/100 — this site sits in the bottom third of the power plants we cover by heating degree-days.
In colder climates, uninsulated hot equipment (boilers, turbines, valves, steam lines) loses proportionally more heat to ambient air — exactly the loss Inzonex modular insulation is designed to cut.
Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.
The #16 largest biomass power plant of 31 in Australia by capacity.
Australia has 31 biomass power plants in this dataset, together about 720 MW of capacity.
Coordinates -21.1421, 148.94 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
