The Enguri Dam is a hydroelectric dam on the Enguri River in Tsalenjikha, Georgia. Currently it is the world's second highest concrete arch dam with a height of 271.5 metres (891 ft).[1][2][3] It is located north of the town Jvari. It is part of the Enguri hydroelectric power station (HES) which is partially located in Abkhazia.

This article's lead section may be too short to adequately summarize the key points. (November 2020)

Enguri Dam
Location of Enguri Dam in Georgia Show map of Georgia Enguri Dam (Samegrelo-Zemo Svaneti) Show map of Samegrelo-Zemo Svaneti
Country	Georgia
Location	Jvari, Tsalenjikha, Samegrelo
Coordinates	42°45′33″N 42°01′55″E
Status	Operational
Construction began	1961
Opening date	1978
Owner(s)	Engurhesi Ltd. (Georgian Government)
Dam and spillways
Type of dam	Arch dam
Impounds	Enguri River
Height	271.5 m (891 ft)
Power Station
Operator(s)	Ltd. Engurhesi
Turbines	5 × 260 MW
Installed capacity	1,300 MW
Annual generation	4.3 TWh
Immovable Cultural Monument of National Significance of Georgia
Official name	Enguri arch dam
Designated	September 4, 2015; 7 years ago (2015-09-04)
Item Number in Cultural Heritage Portal	14738
Date of entry in the registry	August 31, 2015; 7 years ago (2015-08-31)

History

Soviet First Secretary Nikita Khrushchev initially proposed a major dam and hydroelectric power scheme on the Bzyb River as his favourite resort was located near the mouth of the river at Pitsunda. However, his experts informed him that a dam built on the Bzyb River would have had catastrophic effects in causing beach erosion at Pitsunda, so in the end the dam was built on the Enguri River instead, where the impact upon the coastline was assessed to be considerably less pronounced.[4]

Construction of the Enguri dam began in 1961. The dam became temporarily operational in 1978, and was completed in 1987. In 1994, the dam was inspected by engineers of Hydro-Québec, who found that the dam was "in a rare state of dilapidation".[5] In 1999, the European Commission granted €9.4 million to Georgia for urgent repairs at the Enguri HES, including replacing the stoplog at the arch dam on the Georgian side and, refurbishing one of the five generators of the power station at the Abkhaz side.[6] In total, €116 million loans were granted by the EBRD, the European Union, the Japanese Government, KfW and Government of Georgia.[1] In 2011 the European Investment Bank (EIB) loaned €20 million in order to complete the rehabilitation of the Enguri hydropower plant and to ensure safe water evacuation towards the Black Sea at the Vardnili hydropower cascade.[7]

In the early 1980's, a series of radio relays were built to connect the Enguri Dam with the Hudoni Dam, which was under construction. The relays were in remote territory with no access to electricity, and thus were powered with a series of eight radioisotope thermoelectric generators (RTGs). However, the Hudoni dam's construction was stopped as Georgian independence from the Soviet Union drew near. The stations and their RTGs were abandoned and eventually dismantled. The RTG's became lost at this time. Two were rediscovered in 1998, leading to no injuries. Two more were found in 1999, and again led to no injuries or significant radiation exposure. Two more were rediscovered in 2001, which led to the Lia radiological accident. The other two sources remain unaccounted for.[8]

Technical features

The Enguri hydroelectric power station (HES) is a cascade of hydroelectric facilities including, in addition to the dam - diversion installation of the Enguri HES proper, the near-dam installation of the Perepad HES-1 and three similar channel installations of the Perepad HESs-2, -3, and -4 located on the tailrace emptying into the Black Sea.[9] While the arch dam is located on the Georgian controlled territory in Upper Svanetia, the power station is located in the Gali District of region Abkhazia of Georgia.[6] Enguri HES has 20 turbines with a nominal capacity of 66 MW each,[10] resulting in a total capacity of 1,320 MW. Its average annual capacity is 3.8 TWh, which is approximately 46% of the total electricity supply in Georgia as of 2007.[11] According to the 1992 agreement Abkhazia gets 40% and the rest of Georgia gets 60%, however in the late 2010s the Abkhazian consumption increased significantly driven in part by bitcoin mining.[12][13]

The facility's arched dam, located at the town of Jvari, was inscribed in the list of cultural heritage of Georgia in 2015.[14]

See also

• List of power stations in Georgia (country)
• Energy in Georgia (country)
• Vardnili Hydroelectric Power Station, connected to the Enguri complex

References

Notes

На других языках

[de] Enguri-Staumauer

[ru] Ингурская ГЭС