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Hydro power plant "Piva"

HPP “Piva” is a reservoir dam facility with one of the largest concrete arch dam in the world. It was built in 1976.

Its main activity is production of electricity in peak mode, because it has the ability to start quickly and synchronize to the electric grid of 220 kV. HPP “Piva” is situated in the mountain range on the northwest of Montenegro. Due to the specific topographical features of the ground, complete installation of facilities was done below the surface.

The designer of the dam was "Energoprojekt" - Belgrade, and of underground facilities "Elektroprojekt" - Ljubljana. Model testing and geotechnical works were carried out by: Institute "Jaroslav Cherni" and "Geosonda" - Belgrade, while the main construction work was performed by "Hidrotehnika" - Belgrade.

Hydro power plant "Piva", from putting into operation in 1976, has worked in the electrical system of the Republic of Serbia based on the exchange of electricity, in accordance with the Agreement on long-term business-technical cooperation which was restored in the 1991, and concluded for a definite term of 25 years.

In the period of exploitation, from the beginning until the end of 2014, HPP “Piva” produced 30,03 TWh of electricity. Record production of 1,286 GWh was generated in 2010.

In 2015. HPP "Piva" produced 631,04 GWh of electricity. 

As for the development plans, the vision of this plant is extension of its life, greater reliability and greater overall power generation, and strategic intent is the reconstruction and modernization of equipment and facilities.

In HPP “Piva” in 2004 began Phase I of the Project of reconstruction and modernization of equipment which included: replacement of the excitation of generators, installation of electric braking systems, replacement of high voltage circuit breakers in distribution systems and replacement of 220 kV bus bar disconnections in the fields of transmission lines 220 kV. Funds for implementation of this phase are provided from the European Investment Bank and own resources of EPCG. So far, most of the work is completed.

In HPP “Piva”, in early March 2008, began Phase II of the Project of reconstruction and modernization of equipment and building facilities with the aim of reconstruction and modernization of equipment and facilities, hydroelectric plants, with the planned effects of increasing reliability and security of power plants and power increase of aggregates.

Basic technical characteristics of HPP “Piva” are:

  • Installed power - 360 MW,
  • The total storage capacity - 824 x 10 ³ x 10 ³ m³
  • Storage capacity - 746 x 10 ³ x 10 ³ m³
  • The projected annual production of electric energy - 860 GWh
  • Energy accumulation value 275 GWh
  • Three helical turbines with vertical shaft (250 rpm) such as "Francis"
  • Three-phase generator with a vertical shaft (250 rpm) of 120 MVA
  • Three-phase transformer (15,75 / 220 kV) of 120 MVA
  • Structural concrete arch dam height is 220m, hydraulic height of 190m, arc length on the crown is 268,6m, long arc in level of the bed 40m
  • Normal backwater elevation - 675.0m above sea level
  • Minimum operating level - 595.0 m above sea level
  • The maximum net head - 181.95m
  • Minimum net head - 99.90 m
  • Installed flow - 3x80 m³/s
  • Catchment area of HPP "Piva" is 1760 km²