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Presented at “Short Course VI on Utilization of Low- and Medium-Enthalpy Geothermal Resources and Financial Aspects of Utilization”, organized by UNU-GTP and LaGeo, in Santa Tecla, El Salvador, March 23-29, 2014. GEOTHERMAL TRAINING PROGRAMME LaGeo S.A. de C.V. HYBRID POWER PLANT USING THREE ENERGY RESOURCES AT THE SAN VICENTE GEOTHERMAL FIELD, EL SALVADOR Caleb Nájera, Álvaro Flamenco and Salvador Handal LaGeo S.A. de C.V. 15 Av. Sur, Col. Utila, Santa Tecla EL SALVADOR cnajera@lageo.com.sv, aflamenco@lageo.com.sv, shandal@lageo.com.sv ABSTRACT A conceptual design of a 10 MW power plant (3HS+ORC), where energy comes from hybridization of geothermal water, solar irradiation and biomass heat sources (3HS), is proposed to generate electricity by a conventional organic Rankine cycle (ORC) with isopentane as a working fluid. The power plant performance is preliminarily assessed by integrating the amount of these renewable energies available in the northern boundary of the San Vicente geothermal field. 1. INTRODUCTION Global energy crisis demands many countries to change or diversify their energy matrix. This is done mainly by reducing fossil consumption and opening up to technologies that use renewable energy as indigenous energy resources. During the 70’s and this century’s worldwide crisis, El Salvador began to assess solar, small hydro, wind and biomass renewable energies to add them to its energy matrix, which is composed mainly of imported oil, large hydro from Lempa River and high enthalpy geothermal resources. A political frame to develop electricity generation projects based on renewable energy has existed since 2009 in El Salvador. For instance, tax incentives for projects up to 20 MW size and a long term strategy (2015-2025) are applied to meet electrical demand considering natural gas and renewable energy such as geothermal, photovoltaic, small hydro, wind and biogas technologies. Power plant technology based on hybrid systems like geothermal-thermosolar or geothermal- thermosolar-biomass should be developed by the generator sector to take advantage of the cheaper indigenous energy, and therefore the country should be ready for the electricity demand and environmental obligations beyond 2020. In Ahuachapán (Alvarenga, et al. 2008) and Berlin (Handal and Alvarenga, 2010) geothermal fields, LaGeo has demonstrated that thermosolar concentration and geothermal residual water can be combined to produce saturated steam to drive steam turbines, without scaling or corrosion problems in the solar field, however, low availability factor was an issue because of the duration of the solar day. To improve the availability and capacity factors of an ORC power plant using isopentane as a working fluid as well taking advantages of low to medium geothermal resources existing in El Salvador became the reasons to assess and discuss the 3HS+ORC hybrid power plant concept. 1PDF Image | HYBRID POWER PLANT USING THREE ENERGY RESOURCES
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