Construction on Ecuador’s 1,500-MW Coca Codo Sinclair hydroelectric project is slated to begin by the end of the month after a months-long stalemate between the country and the Chinese groups financing 85% of the effort. Ecuador broke off discussions with Sinohydro in March over the terms of the $1.7-billion financing agreement but resumed talks after overtures from the Chinese government. The dam is on the Napo River, a tributary of the Amazon, about 75 miles east of Quito. Coca Codo is expected to supply up to 70% of Ecuador’s electricity needs, reducing its dependence on imported power.
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.