Slapy — Czech Republic

Slapy is a 144 MW hydro power station in Moravian-Silesian, Czech Republic. It is operated by CEZ Group. Based on its capacity (estimated), it can supply roughly 144k homes (estimated). It ranks #27 of 481 Czech Republic power plants by installed capacity. Commissioned in 1955, it is around 71 years old — an older, legacy facility. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 2.3% of Czech Republic's electricity; the national grid averages 401 gCO₂/kWh (59.2% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1019179.

Data provenance

Capacity and fuel are the upstream open-dataset record, not yet matched to a 2026 registry or GEM entry.

capacity: WRI GPPD; fuel: WRI GPPD

In context: how this plant compares

At 144 MW, Slapy is around the median hydro plant in Czech Republic (144 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 Czech Republic hydro capacity

7.9% of 1,815 MW across 8 plants in this dataset

Age among peers

2 of 8 dated hydro plants in Czech Republic 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 Czech Republic

Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by CEZ Group. All plants by this company →

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 49.8°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 72% 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: 87/100 — 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.

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 #4 largest hydro power plant of 8 in Czech Republic by capacity.

Czech Republic has 8 hydro power plants in this dataset, together about 1,815 MW of capacity.

Nearby power plants

• Rýmařov Solar Power Plant · Solar · 1.1 MW · Moravian-Silesian
• Velký Újezd Solar Power Plant · Solar · 1.9 MW · Olomoucky
• Příkazy u Olomouce Solar Power Plant · Solar · 1.6 MW · Olomoucky
• Olomouc power station · Coal · 50 MW · Olomouc
• Velký Týnec Solar Power Plant · Solar · 1.4 MW · Olomoucky
• Otice Solar Power Plant · Solar · 2.5 MW · Moravskoslezsky

Location

Coordinates 49.8237, 17.4342 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions