Four hydroelectric dams along Brazil’s Rio Doce remain closed for an indefinite time after a deadly mining spill in November flooded the river with thick mud, according to water agency ANA. ANA said in an emailed statement that only one of four hydro plants along the 800 km (497 mile) river, which runs through states of Minas Gerais and Espirito Santo, had requested to power up as the others continue to assess potential damage from the spill.
