New Hampshire landowners are fighting the Northern Pass project, a $1.1-billion transmission line designed to import a reliable source of renewable hydropower from Canada into New England, where transmission and generation are constrained. Developers of the 180-mile line recently agreed to remove five alternatives for the line and focus on routes that would use existing rights-of-way south of Groveton, N.H., as well as a preferred route and several alternatives to the north that would require new rights-of-way. In an April 12 filing with the U.S. Dept. of Energy, Northern Pass officials successfully obtained an extension until June 14 to identify
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.