The first of nine potential geothermal powerplants being developed by Reno, Nev.-based Gradient Resources will be built by McLean, Va.-based Science Applications International Corp.’s design-build subsidiary, Benham Constructors LLC. Construction of the 60-MW powerplant at Gradient’s Patua site, near Fernley, Nev., will begin the second quarter of this year, with commercial operation expected in the third quarter of 2017. No contract value was given to the engineering, procurement and construction contract for the estimated $270-million project. The Sacramento Municipal Utility District already has contracted for a portion of the plant’s production. SAIC will use TAS Energy technology for the project.
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.