In the rush for more renewable energy, wind and solar seem to get all the attention. But it’s good, old-fashioned hydropower from dams that is the oldest and most widely used alternative energy – so it’s no surprise that hydro is now making quite a comeback. This according to USA Today, which reports that the first hydroelectric plant in the Eastern U.S. in two decades is now being built in Pennsylvania, where a utility company is upgrading the Holtwood Dam on the Susquehanna River to light 100,000 homes. With utilities nationwide proposing more than 70 projects that could boost hydro capacity by more than 10% over the next decade, it sounds like the water wheels are spinning for hydro’s possibilities.