Trebinje I Hydroelectric Power Station or Trebinje-1 Hydroelectric Power Station is hydroelectric power plant (HPP) on the Trebišnjica River near Gornje Grančarevo in the municipality of Trebinje in Bosnia and Herzegovina. Trebinje-1 HPP is accumulation with dam toe powerhouse type of facility with a large Grančarevo arch dam. At the height of 123 m (404 ft), Grančarevo dam is the tallest dam in the country. Its reservoir, Bileća Lake, is the largest by volume in Bosnia and Herzegovina as well. The dam provides for flood control and hydroelectric power generation at Trebinje-1 HPP. The dam was completed in 1967 and its 180 MW power station, A smaller 8 MW power station, Treblinje-2, was completed downstream in 1979.^[1][2][3]

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Trebinje-1 Hydroelectric Power Station
Trebinje-1 Hydroelectric Power Station
Location of Trebinje-1 Hydroelectric Power Station in Bosnia and Herzegovina
Country	Bosnia and Herzegovina
Location	Gornje Grančarevo, Trebinje
Coordinates	42°44′2.15″N 18°29′48.57″E
Purpose	Flood control, Electricity generation
Status	Operational
Construction began	1967; 57 years ago (1967)
Opening date	1968 (1975 expanded capacity)
Dam and spillways
Type of dam	Arch dam
Impounds	Trebišnjica River
Height	123 m (404 ft)
Length	439 m (1,440 ft)
Width (crest)	4.6 m (15 ft)
Width (base)	27 m (89 ft)
Reservoir
Creates	Bilećko Lake
Total capacity	1,280,000,000 m3 (1,040,000 acre⋅ft)
Active capacity	1,082,000,000 m3 (877,000 acre⋅ft)
Trebinje-1 Hydroelectric Power Station
Commission date	1968
Type	Conventional
Hydraulic head	104.5 m (343 ft)
Turbines	2x54, 1x63 MW Francis-type
Installed capacity	180 MW

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Reversible (pumped-storage) Čapljina Hydroelectric Power Station, using Trebišnjica waters through compensation basin Lake Vrutak, was commissioned in 1968. The river Trebišnjca also powers Dubrovnik Hydroelectric Power Station in Croatia, which receiving Trebišnjica waters from Trebinjsko Lake across the state border via derivation tunnel.

• Trebinje-2 Hydroelectric Power Station