HYDRO-ELECTRIC POWER PLANTS: Large Scale

Upper Cisokan Pumped Storage Hydro-Electric Power Plant: 1040 MW

Notable achievement: The 4 x 260 MW Pumped Storage Hydro-electric Plant at Upper Cisokan, now under construction, is the first Pumped Storage Hydro-Electric Plant in Southeast Asia. CONNUSA was part of the Consultancy team responsible for the Detailed Engineering Design phase including the following activities:

• Undertaking additional site investigations to collect data for detailed design purposes
• A comprehensive Environmental Impact Assessment Study
• Detailed analysis, calculations and designs for all plant facilities and civil works
• Preparation of detailed drawings
• Preparation of a detailed Schedule for Implementation
• Cost estimates
• Detailed Design Report
• Preparation of Bid Documents and Bid Prequalification Documents.

The electro-mechanical plant included for vertical single stage Francis type reversible pump turbines, the generators, generator transformers, 500 kV substation and all associated ancillary equipment.

+

The civil works included for a concrete rock filled Upper Dam with a height of 74 m and a crest of 391 m; a concrete gravity filled Lower Dam of height 100 m and crest 332 m. The civil works also included an underground power house, intakes, penstocks, surge chamber, tailrace and foundations for all outdoor equipment and associated buildings.

Cirata II Hydro-Electric Power Plant: 500 MW

Notable achievement: The Cirata II Hydro-electric Plant, located in West Java, has an installed capacity of 4 x 125 MW which, at the time of commissioning, was the largest Hydro-Electric Power Plant in Indonesia. CONNUSA was part of the consulting team responsible for the Design Review and Construction Supervision stages.

The electro-mechanical equipment included vertical shaft Francis type turbines, 140 MVA Generators, 3-winding 280 MVA generator transformers and connections to an existing 500 kV substation

The civil works included for intakes, headrace tunnels, an underground power house, penstocks and tailrace.

The services provided by CONNUSA included:

• Audit of Contractor’s designs and drawings
• Supervision of Construction and Commissioning
• Monitoring of Implementation Schedule
• Inspection during manufacture and witnessing of factory tests
• Assistance in preparation of “as-installed” drawings
• Review of Operation and maintenance Manuals
• Preparation of Project Completion Report.
• Technology Transfer activities

Asahan 3 Hydro-Electric Power Plant: 174 MW

The Asahan 3 Hydro Power Plant, in North Sumatra, comprises 2 x 87 MW generator sets driven by vertical shaft Francis type turbines. The 2 x 97 MVA generator transformers connect to a 150 kV substation. The substation and outgoing 64 km of 150 kV overhead lines formed part of the contract.

The run of river scheme includes for a concrete weir, headrace tunnel, penstocks, an underground power house and tailrace.

Initially CONNUSA was involved in the preparation of a Detailed Design Report. Subsequently CONNUSA became involved in The Design Audit and Construction Supervision phase providing services similar to those described above for Cirata II

Juanda Hydro-Electric Power Plant: 186 MW

Rehabilitation studies have been undertaken for the Juanda Hydro-electric Plant comprising 6 units with a total installed capacity of 186 MW. The study included

• A review of all operating and maintenance records
• A review of hydrology records
• An Asset Condition Assessment of all plant and equipment including waterways, gates, valves and other ancillary plant
• Production of a Modernization Master Plan with recommendations regarding actions to be taken to achieve the Clients stated objectives
• Preparation of cost estimates for all recommended actions

CONNUSA was the lead firm responsible for the rehabilitation studies.

Simanggo 2 Hydro-Electric Power Plant: 86 MW

Simanggo-2 Hydro-Electric Power Plant is located in Humbang Hasundutan Regency, North Sumatera with a potential installed capacity of 86 MW. The generated power will be connected to the North Sumatera grid subsystem. CONNUSA performed the Pre-Feasibility Study.

Masang 2 Hydro-Electric Power Plant: 55 MW

Masang-2 Hydro-Electric Power Plant, located in Agam Regency, West Sumatera, has a potential installed capacity of 55 MW. The generated power will be connected to the West Sumatera grid subsystem. CONNUSA performed the Pre-Feasibility Study.

The Feasibility Studies fir Simanggo 2 and Masang 2 Hydor-Electric Power Plants required the determination of existing irrigation system developments, collection of data on Topographic Surveys, Geological Surveys, Hydrological Surveys, and also preliminary grid connection analyses.