To amend section 111 of the Clean Air Act to exclude energy efficiency projects, pollution control projects, and reliability projects from the definition of a modification.

“(9) For purposes of paragraph (4)(B):

“(A) The term energy efficiency project means any project or activity undertaken at a stationary source (including any physical change in, or change in the method of operation of, such source) or any group of projects, activities, or changes undertaken during the same outage period—

“(i) as a result of which the maximum hourly carbon dioxide emissions rate of the source is lower than it was immediately before such project or activity, or such group of projects, activities, or changes, was undertaken; and

“(ii) after which the maximum hourly emission rate for any other regulated pollutant is no more than either the facility-wide or unit-specific permitted emission rate.

“(B) The term pollution control project means any project or activity undertaken at a stationary source (including any physical change in, or change in the method of operation of, such source) or any group of projects, activities, or changes undertaken during the same outage period, that is undertaken to reduce the emission of any pollutant.

“(C) The term reliability project means any project or activity undertaken at a stationary source (including any physical change in, or change in the method of operation of, such source) or any group of projects, activities, or changes undertaken during the same outage period, that improves the ability of the electric system—

“(i) to supply the aggregate electric power and energy requirements of the electricity consumers at all times, taking into account scheduled and reasonably expected unscheduled outages of system components; and

“(ii) to withstand sudden disturbances such as electric short circuits, the unanticipated loss of system components, or disturbances caused by manmade physical or cyber attacks.”