ITEZHI-THEZI POWER HYDROPOWER GENERATION PROJECT
- Référence: P-Z1-FAB-007
- Date d’approbation: 13/12/1901
- Date de début: 01/01/2002
- Date d'évaluation: 11/02/2009
- Statut: En coursOnGo
- Agence d'implémentation: --
- Emplacement: ZAMBIA
The project involves the development, construction, operation and maintenance of a 120MW base load hydro power plant at the site of the ITT dam on the Kafue River in Zambia. The Project is being developed by ITPC, a special purpose joint venture project company on a 25 year concession. At the end of the concession period, the power station will revert to the Government of Zambia at a cost of US$1 (refer to section 2.20.1).
The ITT dam is located on the Kafue River and was built by the Government of Zambia in the 1970s as a storage facility for the 900MW Kafue Gorge Power Station (230 km downstream). The plant, which will utilize the existing dam infrastructure, will consist of two Kaplan vertical-shaft turbines directly connected to synchronous generators contained in a surface powerhouse constructed adjacent to the existing ITT dam. The plant will have a maximum generation capability of 120MW. The units will discharge an aggregate of 138m3/s, at a rated head of 40m, and generate an average energy supply of 611 GWh/year, and a firm energy supply of 450 GWh/year.
A pre-feasibility study for the Project was undertaken by SWECO, in 1977. Harza Engineering Company subsequently completed a feasibility study in 1999. In 2007, TATA Consulting Engineers (TCE), a subsidiary of TATA was contracted to review and update the feasibility study. The project design was arrived at on the basis of evaluations of surface and underground powerhouse alternatives and optimization studies conducted by both ZESCO and TCE.
The existing ITT dam was completed in 1978. The reservoir is impounded by an earth fill dam with a maximum height of about 51m and a crest length of about 1,400m. At its current elevation, the dam is considered to be stable and in an acceptable condition. The spillway facilities are considered adequate for the updated estimate of the spillway design, which was defined as having a return period of 10,000 years and estimated from a 90-year record. The Project will use the existing intake and upstream part of the south diversion tunnel as the intake and part of headrace tunnel. New facilities will include a pressure tunnel, surge shaft with an emergency gate, short penstocks, main inlet valves, a machinery hall, a tail race and switchyard.
The power will be evacuated using a new 300 km 330kV Transmission Line via Mumbwa substation onto existing Lusaka West substation. The Transmission line is to be developed, constructed, financed and operated by ZESCO. Total project cost of the transmission line is currently estimated at USD 146.5 million. ZESCO will raise the required funding from concessional debt sources separate from the ITT power station and to that end, the Bank has been approached.
1. Increase the electricity supply 2. Increase access to electricity 3. Improve water supply and sewerage 4. Improve district health facility 5. Reduce of GHG emissions 6. Job creation during construction 7. Job creation during operation 8. Financial sustainability of ITT 9. Financial sustainability of the T-Line 10. Generate revenues for the government
The project aligns with the Zambian strategy to develop its natural endowments of hydropower generation potential for national consumption and international sale. It aligns with the Bank's clean energy investment framework, regional integration strategy and the PSO priority for infrastructure development. As a PPP that will draw on ADF resources for the Governments share of equity and ADB non-sovereign resources, it demonstrates the Bank's comparative advantage as a public-private institution.
Expected development outcomes include:
(i) reliable, low-cost power and sustainable energy,
(ii) a number of temporary and permanent jobs,
(iii) support to economic growth and social development in Zambia and the countries to which power is sold, and
(iv) promotion of regional integration.
LI Jing - PISD2