A new method could transform abandoned coal mines across the U.S. into massive underground batteries for clean energy.

From Europe to North America, an energy revolution is breathing new life into empty, long-forgotten coal mine shafts—by repurposing them into places to store renewable energy. Using "gravity batteries ...

The sensors operate on an ultra-low-power protocol, enabling deployments to remain in place for as long as 10 years with zero need for maintenance.

Rick Sr. discovered a 150-year-old abandoned gold mine on a remote Arizona ranch 40 years ago and dreamed of saving the old ore cart. Now, his son, owner of Murphys Diesel, has built Hellboy, a ...

Cumberland is testing whether its abandoned coal mines can become a town-wide geothermal network that supports redevelopment, economic growth, and lower emissions.

Dozens of people get injured or die in the U.S. every year because they don’t follow this simple advice: Stay out of abandoned and active mines and surrounding lands. Abandoned mines are not history ...