The purpose of this legislation is to promote the upgrade and maintenance of existing hydroelectric dams in the United States. It aims to increase the production of clean energy, enhance the reliability of the electric grid, and improve the health of rivers and wildlife habitats. The act is titled the "Maintaining and Enhancing Hydroelectricity and River Restoration Act." Key provisions of the legislation include a tax credit equal to 30 percent of the costs associated with improvements made to hydroelectric facilities.