Ilarionas is a 154 MW hydro power station in West Macedonia, Greece. It is operated by Public Power Corporation SA [100%]. Based on its capacity (estimated), it can supply roughly 154k homes (estimated). It ranks #37 of 99 Greece power plants by installed capacity. Commissioned in 2011, it is around 15 years old — relatively modern. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 5.9% of Greece's electricity; the national grid averages 315 gCO₂/kWh (49.7% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1061089.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Source of the capacity and fuel values:
capacity: GEM · 2026 · L100000601756; fuel: WRI GPPD
In context: how this plant compares
At 154 MW, Ilarionas is around the median hydro plant in Greece (160 MW). Technically it is described as conventional storage. 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.
Key facts
- Share of Greece hydro capacity
- 4.1% of 3,729 MW across 18 plants in this dataset
- Age among peers
- 15 of 16 dated hydro plants in Greece are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest hydro plants in Greece
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Public Power Corporation SA [100%].
Local climate & thermal context
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a temperate oceanic climate (Köppen Cfb) — Northern Hemisphere, latitude 40.1°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 5% 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: 52/100 — this site sits in the mid 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.
Site climate & environmental severity
This site sits in a mild atmospheric environment (estimated ISO 9223 class C2 — Low), with humidity / wetness the leading environmental stress.
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.
How it compares & nearby plants
The #11 largest hydro power plant of 18 in Greece by capacity.
Greece has 18 hydro power plants in this dataset, together about 3,729 MW of capacity.
Nearby power plants
- Mithras · Solar · 6 MW · West Macedonia
- Polyphyto · Hydro · 375 MW · West Macedonia
- Agios Dimitrios power station · Coal · 1,456 MW · West Macedonia
- Ptolemaïda power station · Gas · 1,350 MW · Western Macedonia
- Kardia power station · Coal · 1,250 MW · West Macedonia
- Liptol power station · Coal · 33 MW · West Macedonia
Location
Coordinates 40.0966, 21.8039 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Ilarionas?
Ilarionas is a 154 MW hydro power plant in West Macedonia, Greece, commissioned in 2011.
Who operates Ilarionas?
Ilarionas is operated by Public Power Corporation SA [100%].