The issue of jurisdiction for siting transmission lines continues to simmer. A federal appeals court ruled in February that the Federal Energy Regulatory Commission lacked authority to overrule state decisions denying applications for new lines. FERC Chairman Jon Wellinghoff told a House panel on June 12 he disagreed with the appellate court’s ruling but said he had not decided yet whether to appeal it to the Supreme Court.
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.