On October 6, 2003, PPL Corporation, conservation groups, the Penobscot Indian Nation, the State of Maine, and the U.S. Department of Interior announced an agreement aimed at restoring sea-run fish to the Penobscot River, while giving PPL Corporation the opportunity to maintain more than 90% of its current hydropower generation.

Dubbed the Penobscot River Restoration Project, the deal will significantly improve access to over 500 miles of river habitat, allowing for the recovery of native species of sea-run fish. The Penobscot is Maine's largest river, draining 8,570 square miles, about one-third of the state.