The Nature Conservancy and the Cumberland Forest Limited Partnership are turning former Appalachian coal mines into clean energy hubs.

Xcel Energy Colorado is the state's biggest power utility. It serves 1.6 million customers, most of them in its Denver-metro ...

Doc Lloyd, Daisy Bradford and Columbus Marion "Dad" Joiner pose for a photo. In 1930, Joiner uncovered the biggest oil field ...

Three years ago, one of the country’s largest electric utilities, Southern Company, made a splash when it announced it would ...