HES Kosinj/Senj (development project)

Kosinj/Senj Hydropower System

HEP's intention is to implement this project in order to utilize the remaining hydropower potential of the Lika and Gacka watershed by upgrading the existing Senj hydropower system (HPS), which currently transforms water as an energy source mainly in a load mode of operation. Construction of a large reservoir and additional capacities is planned to shift generation to peak hours of the daily diagram. This will enable the injection of a large capacity of control power into the power system by means of flexible hydro generator sets enabling a quick capacity change.

Senj HPS Today

Senj HPS utilizes hydropower potential of the Lika and Gacka rivers in two hydro power plants, Sklope HPP (22.5 MW) and Senj HPP (216 MW). Energy generated in Senj HPS throughout an average hydrological year accounts for about 20 percent of electricity generation from HEP's hydro power plants and about 10 percent of generation from the total generation portfolio of HEP and covers about 5 percent of total electricity demand in Croatia. 

CO2 emission avoided thanks to the quantity of hydropower is around 900.000 tons per year. 

Expected Benefits

The second phase will increase electricity generation, improve flood control in the Kosinj Field, improve the reliability of water supply of the water supply system of the Croatian coast – southern branch, as well as improve the road and other communal infrastructure. It will also improve the quality of water resources utilization in terms of support to the stability of the power system along with increase of the renewable energy sources in the final consumption. The existing Senj HPP provides the services of secondary power/frequency control in the power system, and additional capacities will improve such services and allow higher takeover of renewable energy through providing of the energy balancing services.
Nowadays, the Lika-Gacka hydropower system has a capacity of 238.5 MW and an average annual generation of 1.15 TWh. Construction of Phase 2 facilities will provide for additional capacity of 412 MW and additional generation of 320 GWh per year, whereby most of the energy will be peak energy. Implementation of Phase 2 of Senj HPS construction project will result in the total installed capacity in the watershed of 656 MW and average annual generation of 1.5 TWh.

General information:

Investor: HEP
Location: Kosinj, Gusić polje, Grabova
Name: HE Kosinj/Senj 2 HPP
Type of product: Electricity
Type of power plant:    Hydro power plant, high-pressure reservoir plant
Type of fuel: Hydro power – renewable source of energy
Capacity/efficiency: 412 MW / >90%
Annual generation/regime: An increase of 320 GWh (the system total: 1,5TWh) / peak load plant
Value of investment: EUR 500 million
Funding: Own funds / loan 
Project status: Development of the Environmental impact Assessment Study and preliminary design for the location permit, preparation of property-legal affairs
Construction period: 6 years