Hydro power plant in Eastern Highlands, Papua New Guinea. Approximate location -6.2482, 145.9744.
HydroEastern HighlandsPapua New Guinea
Yonki Toe of Dam is a 18 MW hydro power plant in Eastern Highlands, Papua New Guinea. It is operated by PNG Power Limited. Based on its capacity (estimated), it can supply roughly 18k homes (estimated). It ranks #8 of 15 Papua New Guinea power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 21.1% of Papua New Guinea's electricity; the national grid averages 514 gCO₂/kWh (23.7% low-carbon) (2024).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1022427.
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
The capacity and fuel fields on this page are source-record values from the upstream open dataset. They are useful for identification and ranking, but they have not been upgraded to a 2026 registry/GEM-location verified value.
capacity: WRI Global Power Plant Database source-record (legacy); fuel: WRI source-record fuel
At 18 MW, Yonki Toe of Dam is around the median hydro plant in Papua New Guinea (18 MW). 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.
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Operated by PNG Power Limited.
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a tropical rainforest climate (Köppen Af) — Southern Hemisphere, latitude 6.2°S — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
This site has effectively no heating season (tropical/equatorial climate), so winter heat loss is not the driver here. The thermal concern shifts to year-round process heat and humidity/heat-driven corrosion of hot equipment.
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 #3 largest hydro power plant of 6 in Papua New Guinea by capacity.
Papua New Guinea has 6 hydro power plants in this dataset, together about 165 MW of capacity.
Coordinates -6.2482, 145.9744 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Yonki Toe of Dam is a 18 MW source-record hydro power plant in Eastern Highlands, Papua New Guinea.
Its output is enough to supply roughly 18,020 homes (estimated).
Yonki Toe of Dam is operated by PNG Power Limited.
