; or (ii) reasonable, economically feasible, and essential to prevent loss of or damage to, or to mitigate adverse effects on, fish and wildlife resources directly caused by the construction and operation of the qualifying facility, as compared to the environmental baseline existing at the time the Commission grants the exemption. (B) No changes to release regime No Federal authorization required with respect to a qualifying facility, including an exemption granted by the Commission under this subsection, may include any condition or other requirement that results in any material change to the storage, control, withdrawal, diversion, release, or flow operations of the associated qualifying nonpowered dam. (4) Environmental review The Commission’s environmental review under the National Environmental Policy Act of 1969 of a proposed exemption under this subsection shall consist only of an environmental assessment, unless the Commission determines, by rule or order, that the Commission’s obligations under such Act for granting exemptions under this subsection can be met through a categorical exclusion. (5) Violation of terms of exemption Any violation of a term or condition of any exemption granted under this subsection shall be treated as a violation of a rule or order of the Commission under this Act. (6) Annual charges for enhancement activities Exemptees under this subsection for any facility located at a non-Federal dam shall pay to the United States reasonable annual charges in an amount to be fixed by the Commission for the purpose of funding environmental enhancement projects in watersheds in which facilities exempted under this subsection are located. Such annual charges shall be equivalent to the annual charges for use of a Government dam under section 10(e), unless the Commission determines, by rule, that a lower charge is appropriate to protect exemptees’ investment in the project or avoid increasing the price to consumers of power due to such charges. The proceeds of charges made by the Commission