Cethana is a 100 MW hydro power station in Tasmania, Australia. It is operated by Hydro-Electric Corporation (Tasmania). Based on reported annual generation of 426 GWh, it can supply roughly 122k homes. It ranks #182 of 536 Australia power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 4.3% 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 AUS0000144.
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
The public capacity above is a source-verified 2026 capacity claim: 100 MW for Cethana hydroelectric plant.
Source: GEM tracker raw 2026. Scope: operating/nameplate; source-backed GEM tracker 2026 plant record. Confidence: high_source_row_verified.
The capacity and/or fuel fields on this page include a source-backed provenance label from GEM, an official registry, Wikidata, OSM, or a cross-source match.
capacity: GEM tracker 2026 (location L100000600057); fuel: WRI source-record fuel
At 100 MW, Cethana is well above the median hydro plant in Australia (45 MW). Technically it is described as pumped storage. Its current lifecycle status is “pre construction” — so it is not yet, or no longer, generating at full output. Hydropower converts the energy of falling or flowing water into electricity; output depends on rainfall and reservoir level, and large dams also provide grid balancing and storage.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Operated by Hydro-Electric Corporation (Tasmania). All plants by this company →
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a temperate oceanic climate (Köppen Cfb) — Southern Hemisphere, latitude 41.5°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 38% above 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: 73/100 — this site sits in the top third of the power plants we cover by heating degree-days.
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.
For a plant’s outdoor hardware — heat-recovery steam generators (HRSG), expansion joints, valves, flanges and their insulation — the local climate sets how fast unprotected steel and coatings degrade. This site sits in a corrosive environment (estimated ISO 9223 class C4 — High), with humidity / wetness the leading environmental stress.
Higher environmental severity is exactly where protective removable insulation pays back most: a sheltered micro-climate slows corrosion, UV and thermal-cycling damage and extends outdoor hardware service life. This is an indicative site-climate context — not a condition assessment of any specific plant or operator.
Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.
The #17 largest hydro power plant of 73 in Australia by capacity.
Australia has 73 hydro power plants in this dataset, together about 8,878 MW of capacity.
Coordinates -41.4787, 146.1349 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Cethana is a 100 MW source-record hydro power plant in Tasmania, Australia, planned/announced for 1971.
Cethana generates about 426 GWh of electricity per year.
Its output is enough to supply roughly 121,828 homes.
Cethana is operated by Hydro-Electric Corporation (Tasmania).
