Smart-grid development advanced on June 18 with the release of the National Institute of Standards and Technologies’ June 18 on standards for the smart grid. The report, prepared by the Electric Power Research Institute, Palo Alto, Cal-if., is the first of three phases in NIST’s plan to expedite development of the smart grid. NIST will accept public comments for 30 days after publication of a notice in the Federal Register announcing the report’s availability, then establish priorities, standards and action plans by early fall.
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.