Nonprofit solar installer GRID Alternatives has launched its national Tribal Solarthon event. Through Oct. 9, the organization is partnering with four tribes in California, New York, South Dakota and Arizona to install solar photovoltaic power systems and, in the process, provide solar job training for tribe members. U.S. Interior Secretary Sally Jewell was on hand at the Shinnecock Nation to put a spotlight on energy and economic issues in Native American communities.