|Dam and spillways|
|Height||111 m (364 ft)|
|Length||317 m (1,040 ft)|
|Total capacity||705,000,000 m3 (2.49×1010 cu ft)|
|Surface area||18 km2 (6.9 sq mi)|
|Turbines||4 x 200 MW|
|Installed capacity||400 MW
800 MW (max. planned)
|Annual generation||1,280 GWh|
Construction of the dam and power station started in 1977. The first generation unit of the Irganai hydropower station was launched in 1998. The second generation unit was launched in 2001.
The dam is 111 metres (364 ft) high and 317 metres (1,040 ft) long at the crest. It is filled of gravel with asphalt-concrete diaphragm. The complex includes tunnel spillway, intake structure, two diversion tunnels 5.2 kilometres (3.2 mi) each, underground surge tanks, steel-reinforced concrete penstocks, and a powerhouse.
Irganai is the largest derivational hydroelectric power station in Russia, with two radial-axial hydraulic units with a capacity of 200 MW each. The power station has a total installed capacity of 400 megawatts (MW) and projected capacity of 800 MW. Its mean annual electric energy output is 1,280 GWh.
The dam creates the Irganai reservoir. The reservoir has a surface area of 18 km2 (6.9 sq mi). Its full capacity is 705,000,000 cubic metres (2.49×1010 cu ft) and alive storage capacity is 397,000,000 cubic metres (1.40×1010 cu ft).
On 7 September 2010, fire broke-out at power station's hall. On 9 September 2010, Russian security forces defused an explosive device equivalent to 3 kilograms (6.6 lb) of trinitrotoluene in the room. On 31 January 2011, a stick of dynamite was discovered at the power station.
- "Fire at Irganay HPP". Hydroproject. 2010-09-08. Retrieved 2011-01-31.
- "Bomb found following fire in hydroelectric plant in Russia's Dagestan". RIA Novosti. 2010-09-09. Retrieved 2011-01-31.
- "Fire breaks out at hydropower plant in Russia's Dagestan". HydroWorld (PennWell Corporation). ITAR-TASS. 2010-09-08. Retrieved 2010-09-08.
- "Explosive device found, defused at hydropower plant in Russia". HydroWorld (PennWell Corporation). 2010-09-09. Retrieved 2011-01-31.
- "Bomb blast prevented at Irganai Dam". Voice of Russia. 2010-09-09. Retrieved 2011-01-31.
- "Dynamite found at power plant in Russia's Dagestan". RIA Novosti. 2011-01-31. Retrieved 2011-01-31.