making-old-mines-new-again

In Michigan’s Upper Peninsula, research is underway that could adapt the contours of underground mines to harness pumped hydro storage. Surplus power would pump groundwater, which tends to flood mines when they are abandoned, up an incline. When energy demands are higher, the water would drop down the mine shafts through turbines that churn out electricity.

A MINE THAT’S DEAD MAY NEVER DIE