Oregon already ranks as the nation’s second largest generator of hydroelectric power. (Washington is No. 1). Now an elegant new installation in Portland is putting an unconventional, sharing economy twist on this age-old water-energy pairing. The new system, launched this winter, uses the flow of water inside city water pipes to spin four turbines that produce electricity for Portland General Electric customers.
Transportation accounts for the second-largest source of greenhouse gases in the U.S. (28% in 2012), and the use of renewable fuels, such as biodiesel and ethanol, is booming in light of state and national programs to make transportation fuels cleaner.