Plans to generate electricity at three dams along the Mississippi River are back on the front burner.

Plans to generate electricity at three dams along the Mississippi River are back on the front burner.

Hydro Friends Fund of Alabama and Energy Resources USA of Florida are seeking preliminary federal permits.

The firms hope to build large electricity generators at Lock 24 in Clarksville and Lock 25 near Winfield. Energy Resources also wants authorization for a smaller project at Lock 22 in Canton.

The three hydropower plants would produce enough electricity to supply tens of thousands of homes. Preliminary permits are an early step that would allow the two companies to draft development plans and seek further federal approval.

The projects aren’t the first to be proposed at Clarksville and Winfield. The City of Quincy had permits for the two locations and was working with a Canadian firm on hydropower development. The deal fell through in 2013 amid criticism that Quincy had nothing to show for its multi-million-dollar investment.

The Federal Energy Regulatory Commission is taking written and electronic comments about the three new proposals through early December. For more information, go to www.ferc.org or call toll-free 1-866-208-3676.