Two Denver companies announced Tuesday at the United Nations Private Sector Forum in New York City that they will team up to tackle the lack of electrical grid connectivity on the Navajo Nation in the Four Corners region. Nokero International , which supplies solar-powered lights and mobile chargers, will work with Eagle Energy , a non-profit formed by Agriculture Secretary Tom Vilsack’s son, Doug. The two companies will work with Navajo Nation leaders to provide light in homes that often go dark when the sun sets, hopefully replacing dangerous and unhealthy kerosene lanterns and heaters