42189-012: Nurek 500 kV Switchyard Reconstruction Project | Asian Development Bank

Tajikistan: Nurek 500 kV Switchyard Reconstruction Project

Sovereign (Public) Project | 42189-012 Status: Closed

ADB is helping Tajikistan rehabilitate the Nurek Hydroelectric Power Plant, which produces over 70% of the country's electricity. The project will replace outdated equipment and build a new 500 kilovolt Nurek switchyard within the Nurek Hydroelectric Power Plant complex.

Project Details

Project Officer
Chansavat, Bouadokpheng Central and West Asia Department Request for information
  • Tajikistan
  • Grant
  • Energy
Project Name Nurek 500 kV Switchyard Reconstruction Project
Project Number 42189-012
Country Tajikistan
Project Status Closed
Project Type / Modality of Assistance Grant
Source of Funding / Amount
Grant 0124-TAJ: Nurek 500 kV Switchyard Reconstruction Project
concessional ordinary capital resources lending / Asian Development Fund US$ 54.77 million
Strategic Agendas Inclusive economic growth
Regional integration
Drivers of Change Governance and capacity development
Sector / Subsector

Energy / Electricity transmission and distribution

Gender Equity and Mainstreaming No gender elements
Description The Nurek 500 kV Switchyard Reconstruction Project (the Project) will build a new Nurek 500 kV switchyard on a new site within the Nurek Hydroelectric Power Plant (HEPP) complex to replace the existing Nurek 500kV switchyard. The existing 500 kV equipment will be dismantled and used mostly as spare parts for other 500 kV substations.
Project Rationale and Linkage to Country/Regional Strategy

Nurek HEPP, incorporating 220 kV and 500 kV switchyards, produces over 70% of Tajikistan's electricity and performs a frequency regulation role for the Central Asian power system, which includes the electricity systems of Kazakhstan, Kyrgyz Republic, Turkmenistan, and Uzbekistan.

The existing switchyards were built more than 30 years ago with Soviet technology and replacement parts are no longer available. They are therefore in need of complete replacement. Severe subsidence in areas of the switchyards has been occurring for many years, requiring major ongoing remedial measures. This is due to an extensive salt dome in the vicinity of the switchyards that destabilizes the ground conditions during snow melt and rain. There are risks for both switchyards that a catastrophic event may occur at any time, thereby destroying major parts of the switchgear. Ground stabilization measures are considered impractical.

The Government of Tajikistan considers the reconstruction of the switchyards to be critical due to the deteriorating equipment and unstable geological site conditions that could result in the potential loss of major output from the Nurek HEPP for lengthy periods. A 2006 feasibility study recommended that the equipment in both switchyards be retired, with new switchyards to be built on secure ground. The study also recommended that the least-cost option to utilize a portion of the land would be where the existing 220 kV switchyard is currently located for both new switchyards. The ground conditions of the proposed new site have been verified as satisfactory by geological investigation.

Gas-insulated switchgear technology, which uses approximately 10% of the area required by conventional air-insulated switchgear technology, is required due to the restricted area of the proposed new site.

Impact Reliable electricity supply in Tajikistan.
Project Outcome
Description of Outcome Reliable evacuation of Nurek hydroelectric power plant (HEPP) electricity to the grid.
Progress Toward Outcome The project outcome is achieved as envisaged. The connections to the national power supply grid are accomplished. That is, the risk of natural disasters disabling the switchyard was mitigated and the electricity flow from Nurek HEPP was stabilized.
Implementation Progress
Description of Project Outputs New 500 kV switchyard built at a secure location and connected to the grid and Nurek HEPP.
Status of Implementation Progress (Outputs, Activities, and Issues)

The newly built 500 kV GIS including all auxiliary systems was commissioned on 30 October 2015. The connections to the national power supply grid are accomplished; thus the risk of natural disasters disabling the switchyard was mitigated and the electricity flow from Nurek HEPP was stabilized.

The additional scopes: (i) installation of 3 new OHL towers at existing 500kV switchyard; and (ii) procurement of additional spare parts are successfully completed. Completion of autotransformer`s delivery, installation and commissioning are expected in Q2 2017.

Geographical Location Nurek Dam
Safeguard Categories
Environment B
Involuntary Resettlement C
Indigenous Peoples C
Summary of Environmental and Social Aspects
Environmental Aspects The initial environmental examination (IEE) confirmed that only minor impacts are expected during the construction phase of the Project. All construction works of the new switchyard and dismantling of the old switchyard takes place within the fenced compound of the Nurek Hydroelectric Power Plant (HEPP), which has been in operation for over 30 years. The construction works involve disposal of spoil. The spoil bank is located just outside the Nurek HEPP compound in an area which was once the borrow area for excavating materials for the construction of the dam body. Barki Tajik has been granted the land-use rights, and the area has been used until very recently as a spoil bank to deposit dredged materials from downstream of the Nurek HEPP. Most of the parts and materials generated from dismantling of the existing switchyard will be used as spares in other 500 kV substations, and old metals (steel, copper, and aluminum) will be sold to local recycling companies.
Involuntary Resettlement No involuntary resettlement involved in Project.
Indigenous Peoples The project is not expected to have impacts on indigenous peoples.
Stakeholder Communication, Participation, and Consultation
During Project Design No negative social impacts are envisaged, but a public consultation was held in accordance with ADB's Environment Policy (2002). Public consultation was held on 11 September 2008 at the Nurek City Administration Office and attended by approximately 70 participants. No concerns were raised over the Project.
During Project Implementation Information sharing is envisaged during the project implementation and monitoring.
Business Opportunities
Consulting Services One consulting firm will be recruited as the implementation consultant. The consultant will be selected and engaged in accordance with ADB's Guidelines on the Use of Consultants.
Procurement One turnkey contract for the entire Project will be procured by Barki Tajik using international competitive bidding in accordance with ADB's Procurement Guidelines.
Responsible ADB Officer Chansavat, Bouadokpheng
Responsible ADB Department Central and West Asia Department
Responsible ADB Division Tajikistan Resident Mission
Executing Agencies
Barki Tojik Joint Stock Holding Company
Mr. Sanat Rahimov
[email protected]
64 I. Somoni Str. 734026, Dushanbe, Tajikistan
Concept Clearance 28 Jul 2008
Fact Finding 18 Aug 2008 to 29 Aug 2008
MRM 25 Sep 2008
Approval 17 Nov 2008
Last Review Mission -
PDS Creation Date 26 Aug 2008
Last PDS Update 15 Mar 2017

Grant 0124-TAJ

Approval Signing Date Effectivity Date Closing
Original Revised Actual
17 Nov 2008 26 Dec 2008 20 Mar 2009 31 Jul 2014 31 Dec 2016 03 Apr 2017
Financing Plan Grant Utilization
Total (Amount in US$ million) Date ADB Others Net Percentage
Project Cost 66.90 Cumulative Contract Awards
ADB 54.77 17 Nov 2008 54.76 0.00 100%
Counterpart 12.13 Cumulative Disbursements
Cofinancing 0.00 17 Nov 2008 54.76 0.00 100%
Status of Covenants
Category Sector Safeguards Social Financial Economic Others
Rating Satisfactory Satisfactory Satisfactory Satisfactory - Satisfactory

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Evaluation Documents See also: Independent Evaluation

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Related Publications

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Contracts Awarded

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Procurement Plan