Kastraki is a 320 MW hydro power station in West Greece, Greece. It is operated by Public Power Corporation SA [100%]. Based on reported annual generation of 544 GWh, it can supply roughly 156k homes. It ranks #28 of 99 Greece power plants by installed capacity. Commissioned in 1969, it is around 57 years old — an older, legacy facility. 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 WRI1061076.
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 · L100000601757; fuel: WRI GPPD
In context: how this plant compares
At 320 MW, Kastraki is well above 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
- Load factor
- 19%, from 544 GWh of reported generation; the median for 11 hydro plants in Greece that report generation is 12%
- Generation trend
- 710 GWh in 2015 and 544 GWh in 2017 (−23%)
- Highest and lowest year
- 2015: 710 GWh; 2017: 544 GWh
- Share of Greece hydro capacity
- 8.6% of 3,729 MW across 18 plants in this dataset
- Age among peers
- 4 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)).
Reported generation trend
Annual generation (GWh), 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 hot-summer Mediterranean climate (Köppen Csa) — Northern Hemisphere, latitude 38.7°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 43% 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: 32/100 — this site sits in the bottom 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 moderately corrosive environment (estimated ISO 9223 class C3 — Medium), 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 #4 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
- Stratos · Hydro · 150 MW · West Greece
- Kremasta · Hydro · 437 MW · Central Greece
- Aitoloakarnania · Solar · 5 MW · West Greece
- Pournari · Hydro · 300 MW · Epirus
- Preveza Solar Power Plant · Solar · 4 MW · Epirus
- Sykia · Hydro · 160 MW · Thessaly
Location
Coordinates 38.7413, 21.3654 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Kastraki?
Kastraki is a 320 MW hydro power plant in West Greece, Greece, commissioned in 1969.
How much electricity does Kastraki generate?
Kastraki generates about 544 GWh of electricity per year.
Who operates Kastraki?
Kastraki is operated by Public Power Corporation SA [100%].