SANTA CRUZ, Bolivia—With the electrification of the Bahia Negra plant on Dec. 29, the National Electricity Administration of Paraguay (ANDE) declared the nation now runs on 100 percent renewable electricity. The transition of the Bahia Negra energy station marked a critical turning point, as it was the last thermal power plant in the country. Paraguay has been working toward the exclusive use of hydroelectric power since the 1970s, which was made possible through the Itaipu, Yacreta, and Acaray dams. By 2018, the Itaipu dam alone produced 90.8 percent of the nation’s electricity. Renewable energy is defined as an energy source that replenishes naturally and constantly. Wind, solar, and hydroelectric power are among the most widely used forms. During a ceremony at the Bahia Negra plant, President Abdo Benitez said the transition was “An unprecedented historical event.” On Jan. 2, head of the ANDE Felix Sosa said, “We arrived with 100 percent clean and renewable electricity generation throughout …