Project parameters
Located on the Vltava River, Orlík is the largest hydropower plant in the Czech Republic and a cornerstone of the country's energy system. As part of a landmark modernization, Litostroj has been selected as the general contractor to transform the existing facility into one of the country's largest pumped-storage hydropower plants, strengthening grid stability and supporting the growing share of renewable energy.
Preparing hydropower for the energy transition
As electricity systems become increasingly dependent on renewable energy sources, large-scale energy storage is becoming essential. The Orlík modernization will enable the plant to store surplus electricity and return it to the grid when demand is highest, significantly increasing the flexibility and resilience of the Czech power system.
With an energy storage capacity of up to 750 MWh, the upgraded plant will become the third-largest pumped-storage hydropower plant in the Czech Republic, playing a key role in balancing future electricity generation.
Engineering the next generation of hydropower
The modernization includes the complete replacement of the original 1961 Kaplan turbines with two Francis turbines and two reversible Francis pump-turbines, enabling both electricity generation and energy storage.
As the general contractor, Litostroj is responsible for the complete delivery of the key technological equipment—from hydraulic design, model testing and mechanical engineering to the manufacturing of the new turbine units. The project has been carefully phased to maintain electricity production throughout the modernization by keeping half of the generating units in operation.
Conclusion
The Orlík modernization represents one of the most significant hydropower investments in the Czech Republic in recent decades. Beyond upgrading an iconic power plant, the project will create a strategic energy storage asset that supports grid stability, accelerates renewable energy integration and helps shape the future of the country's energy infrastructure. By leading this transformation, Litostroj once again demonstrates its expertise in delivering complex hydropower and pumped-storage projects.
