In a rapid-fire series, President Barack Obama and Energy Secretary Steven Chu announced $773 million in funding under the American Reinvestment and Recovery Act for geothermal and solar-energy projects. On May 27, Obama announced $350 million for geothermal demonstration projects, research and development, and other geothermal initiatives. He also announced $117.6 million for solar technology development and deployment. On June 1, Chu said the Energy Dept. would invest $156 million in combined heat and power, district energy systems, waste-energy recovery systems and equipment; $50 million in energy efficiency for information and communication technology; and $50 million for advanced clean-energy materials
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.