Leave our Lakes Alone Act - Amends the Federal Power Act to prohibit the Federal Energy Regulatory Commission (FERC) from considering public use and environmental purposes in issuing a license for a project in a state whose law expressly authorizes such a prohibition.

Defines "public use and environmental purposes" to mean the purposes of energy conservation, the protection, mitigation of damage to, and enhancement of, fish and wildlife, the protection of recreational opportunities, the preservation of other aspects of environmental quality, and other beneficial public uses, including irrigation, flood control, and water supply, as such purposes apply to land within a project boundary above the highest target elevation for normal operations of the project.

Exempts projects on federal land from application of this Act.