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Project Name: Miravalles Geothermal Power Plant Project (Unit-1, 55 MW)

Country: Costa Rica

Client: Instituto Costarricense de Electicidad (ICE)

Financial Source: Overseas Economic Cooperation Fund of Japan (OECF)

Service Period: December 1986 to December 1994

Narrative Description of Project :
ICE planned to develop a geothermal power plant, and has been surveyed and developed the geothermal resources. As confirmed the geothermal power potential being more than 140 MW, ICE requested WEST JEC to conduct a feasibility study in 1981. Obtained a loan from the OECF-Japan, ICE constructed a 55 MW geothermal power unit with associated 230 kV transmission lines (36 km and 33 km). The construction work started in 1991 and completed at the end of 1994.


SERVICES provided by WEST JEC

  • Study on existing geothermal data
  • Feasibility study including site selection and conceptual design
  • Basic design
  • Preparation of tender documents
  • Detailed design of building structure and civil works including seismic design.
  • Assistance in bidding and contracting
  • Assistance in contract negotiation
  • Check and review of manufacturesf design and drawings
  • Assistance in the inspection and witness to shop tests
  • Construction supervision
  • Assistance in commissioning
  • Training in power plant design at the consultantfs home office and in construction supervision on OJT basis.

MAIN TECHNICAL FEATURES

@Capacity (gross) 55 MW
@Turbine/Condenser
@Manufacturer TOSHIBA, Japan
@Type Single cylinder, double flow, condensing
@Steam Pressure 0.6 MPa abs.
@Condenser type Low level jet condenser, direct contact

@Generator

@Manufacturer TOSHIBA, Japan
@Capacity 61.2 MVA
@Voltage 13.8 kV
@Frequency 60 Hz
@Power factor 0.9
@Non-condensable Gas Removal System
@Type 2 stage ejector system and 4 stage centrifugal gas compressor system
@Gas content design value 0.6 wt%
@Cooling Tower
@Manufacturer Hamon-Sobelco S.A.
@Type Induced draft, counter flow, concrete structure, 5 cells

Miravalles Geothermal Power Plant Unit-1 under construction

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