The Solar-powered Solar Impulse 2 aircraft prepares to take off from the Cairo International Airport in the Egyptian capital on Sunday as it heads to Abu Dhabi on the final leg of its world tour.
Khaled Desouki /AFP/Getty Images
Consumer advocates took to the streets of Phoenix recently to protest against an Arizona utility's efforts to bill customers using a so-called "demand charge." If approved, Arizona Public Service would be the first utility in the country to place most of its residential customers on that kind of rate plan.
Herman "Dub" Tolbert, shown inside an American Legion post in Bokoshe, Okla., says the community is left exposed and he's determined to make regulators listen.
Joe Wertz/StateImpact Oklahoma
Eric Frumin (right) stands in front of his solar panels on the roof of his Brooklyn home alongside architect David Cunningham (left) and AeonSolar's Allen Frishman (center).
Courtesy of Eric Frumin