DARLINGTON, Md. — A landmark for nearly a century on the Susquehanna River, the future of the Conowingo Dam and its potential impact on Maryland’s most precious natural resource has finally been decided in a 50-year agreement between the state and Constellation.

“Making sure that we can breathe air that is clean,” said Gov. Wes Moore, “Making sure that we can have water that is clean. Making sure that we can have energy that is abundant and reliable and where opportunities are growing.”

The dam has been helping to power the region since it was built back in the 1920s, and it’s Maryland’s largest source of renewable energy.

At a time when the state can’t produce enough electricity, the dam’s hydro-electric plant, alone, provides enough to light up 160,000 homes.

“This resource was calle

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