It is the current EPA standard for all polluting sources that fall under the New Source Review guidelines and is determined on a case-by-case basis.
WEPCo initially believed that the plant, built in 1932, would not be subject to the NSR requirements and would instead fall under "routine maintenance, repair, and replacement".
“New Source Review” (NSR) is a permitting program established by the CAA, which requires the owners or operators of “major” stationary sources of air pollution to obtain permits prior to the construction or modification of those sources.
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