The Northwest Power and Conservation Council�s latest energy plan calls for 85% of new energy needs over the next 20 years to be met through efficiency. Area utilities aren�t so sure of its feasibility. Portland General Electric spokesperson Steven Corson says that the 85% goal can�t be met �cost effectively� and is not realistic with current technologies and Suzanne Hartman of Seattle City Light says that it is �uncertain� if that goal can be met region-wide, although SCL will save enough energy in the next five years to equal the capacity of a new power plant. The Sixth Northwest Power
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.