For many local tribes of Native Americans, energy sales are an important source of revenue. But while much of it is generated by leases of land to coal and natural gas companies, more and more of it is starting to be supplemented by that of wind power. This, according to the Planet Ark news site, which reports how large wind farms, such as the Kumeyaay Wind project in California, are being constructed to service some 15,000 Indian homes. Others, like Arizona’s Navajo tribe, are seriously considering the building of a wind power facility to replace the closing of a nearby coal plant. And even the Lakota Nation of South Dakota is seeking to expand its 750 kilowatt project to 30 megawatts, on its Rosebud Sioux Reservation.