Economical Assess of Concentrated Solar Tower Power Plants in the Brazilian Scenario Guilherme de Sousa Torres * Tulio Andre Pereira de Oliveira ** Anesio de Leles Ferreira Filho *** Elder Geraldo Domingues **** * Department of Electrical Engineering University of Brasilia (e-mail: gstorres.ene@gmail.com). ** Department of Electrical Engineering University of Brasilia *** Department of Electrical Engineering University of Brasilia **** NExT - Center for Experimental and Technological Studies and Research Federal Institute of Goi´as Abstract: Renewable energy integration has been used as one the most common alternatives for governments that chase a diverse energetic matrix and a sustainable expansion of economy. Developing countries with high values of Direct Normal Irradiation (DNI) such as Brazil tend to consider photovoltaic power plants as a valuable option, but the small capacity factor of these systems is often an obstacle. As the energy demand increases, this creates an opportunity for the integration of concentrated solar tower (CST) plants. In this context, an appropriate economical evaluation becomes urgent so to introduce and consolidate this technology into the Brazilian reality. This paper, whose goal is to assess the economical viability of the Solar Tower technology at the Regulated Contracting Environment (RCE), appraise a variety of financial indicators of a power plant simulated in Brazil. The conducted analysis can be an important tool for governments and agencies to make the CSP technology an attractive solution to investors. The results of this paper show that a reduction of 33% on the initial costs and 14% on the discount rate can reduce the Levelized Cost of Energy (LCOE) up to USD 0,027 per kWh. Keywords: CSP; Economic Assessment; Net present value; Regulated Conctracting Environment; Renewable Energy 1. INTRODUCTION As an emerging economy country, Brazil has registered an increase in energy demand. However, the dependence on hydro sources is still a barrier for both a consistent production capacity growth and a diversification of the en- ergetic matrix. Based on the data released by the National Agency of Electrical Energy (Aneel) in 2018, roughly 60% of the energy produced in the country was generated by hydropower systems (HPS) ANEEL (2018). Nonetheless, Brazil has an appropriate climate for the integration of solar-based systems of generation, as a consequence of the high rates of Direct Normal Irradiation (DNI) in some regions of the country. In this sense, a substantial expansion of Distributed Gen- eration (DG) is observed as photovoltaic systems are be- coming more popular and financially viable, specially since Normative Resolution 482 (REN 482/2012) was published by ANEEL, whose goal was to stimulate and also regulate the integration of mini and micro systems of DG ANEEL (2012). If, on the one hand, the integration of photovoltaic sources are positive, on the other the photovoltaic systems are limited by some factors that restrict their consolida- tion. Among these factors, the intermittence on generation and the costs associated with the storage systems (whose application is pointed out as the main solution for this issue), are the ones that stand out, as shown by Ju et al. (2017). In this context, it is worth mentioning the possibility of bringing into the Brazilian matrix new solar-based sources, with the same advantages of the photovoltaic systems, such as the production of renewable energy with low emission of greenhouse gases, and without their disadvantages. Technologies such as the Concentrated Solar Power (CSP), specially the Solar Tower (STP) and the Parabolic-trough Collectors (PTC) power plants, have gained strength in the global scenario (Islam et al. (2018); Amadei et al. (2013); Shabbirr and Liang (2018)). Through the usage of molten salt as storage system, this technology allows the production of energy in a ceaseless manner, enhancing the capacity factor without impacting the final cost of the