Wind-energy developers are working with the state of Hawaii and Hawaii’s largest electric utility to develop wind resources on two islands and deliver power to Oahu. One estimate pegs the program’s cost at $3 billion, but another source says it could cost twice that amount. + Image Photo: Illustration by Martha Hernandez, Courtesy of The Honolulu Advertiser Interisland Wind Project: University of Hawaii performed a sea-floor survey and feasibility study for the state to identify routes and possible obstacles for cable. The Interisland Wind Project encompasses two 200-MW wind farms to be developed on the islands of Lanai and Molokai,
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.