1. a) The applicable standards as set forth in 40 CFR 60, 61, 62 and 63 (incorporated by reference in Section 204.100);
2. b) The applicable SIP emissions limitation, including those with a future compliance date; or
3. c) The emissions rate specified as a federally enforceable permit condition, including those with a future compliance date.

"Allowable emissions" means the emissions rate of a stationary source calculated using the maximum rated capacity of the source (unless the source is subject to federally enforceable limits that restrict the operating rate, or hours of operation, or both) and the most stringent of the following: