Revisão do contrato de demanda e análise da utilização de geração própria de energia em uma unidade industrial de armazenamento de grãos

Abstract

This research focuses on analyzing the electricity billing data of a grain storage unit (GSU) located in the state of Mato Grosso do Sul, Brazil. The company's expenses on electricity significantly increase during the grain-receiving months due to its dependence on seasonal crop periods. Consequently, the objective of this study is to review and adjust the demand contract while evaluating the feasibility of implementing an own electricity generation system in order to reduce energy costs. The analysis involved verifying the hourly tariff modality (HTM) and considering the demand and energy consumption profiles, ultimately identifying the green HTM as the most advantageous option. In the current reference scenario, the annual electricity expenses amount to R$ 110,910.09. By adjusting the demand contract from 130 kW to 115 kW, annual savings of R$ 2,476.41 can be achieved. The company has allocated R$ 100,000.00 for investment in own energy generation. With the purchase of a photovoltaic system costing R$ 104,462.00, an annual energy cost reduction of R$ 16,385.90 (14.77%) can be obtained. Additionally, by renting a 25 kVA diesel generator set (to be used only during peak hours), the annual electricity expenses would increase to R$ 112,438.80. In the case where the amount is not invested in the photovoltaic system, the possibility of investing R$ 100,000.00 in the Treasury SELIC was analyzed, resulting in an estimated return of R$ 10,668.08 in one year. This return was used to reduce the expenses associated with the diesel generator set, resulting in savings of R$ 6,662.96 (8.24%). Based on the findings, it is recommended for the GSU to remain in the green HTM, adjust the demand contract to 115 kW, and acquire a photovoltaic system. This approach would lead to a reduction in electricity expenses of 14.77%.