This commemorative stamp issued by Brazil in 1989 celebrates the centenary of the Marmelos Hydroelectric Power Plant, recognized as the first hydroelectric power station in South America. Located near Juiz de Fora in Minas Gerais, the facility marked a major technological milestone in Latin American industrial development. The stamp illustrates the historic generating station alongside the dam and river landscape, symbolizing early renewable energy innovation. Printed in multicolor photogravure, this issue is highly appealing to collectors of industrial heritage, engineering achievements, and energy-themed philately. A notable modern Brazilian commemorative highlighting infrastructure progress.