Section 204.490  Major Modification

a)         "Major modification" means any physical change in or change in the method of operation of a major stationary source that would result in:

1)         A significant emissions increase (as defined in Section 204.670) of a regulated NSR pollutant (as defined in Section 204.610) other than GHGs (as defined in Section 204.430); and

2)         A significant net emissions increase of that pollutant from the major stationary source.

b)         Any significant emissions increase (as defined in Section 204.670) from any emissions units or net emissions increase (as defined in Section 204.550) at a major stationary source that is significant for VOM or NO_x shall be considered significant for ozone.

c)         A physical change or change in the method of operation shall not include:

1)         Routine maintenance, repair and replacement;

2)         Use of an alternative fuel or raw material by reason of:

A)        An order under sections 2(a) and (b) of the Energy Supply and Environmental Coordination Act of 1974 (15 USC 791) (or any superseding legislation); or

B)        A natural gas curtailment plan under the Federal Power Act (16 USC 791);

3)         Use of an alternative fuel by reason of an order or rule under section 125 of the CAA (42 USC 7435);

4)         Use of an alternative fuel at a steam generating unit to the extent that the fuel is generated from municipal solid waste;

5)         Use of an alternative fuel or raw material by a stationary source that:

A)        The source was capable of accommodating before January 6, 1975, unless the change would be prohibited under any federally enforceable permit condition established after January 6, 1975 under 40 CFR 52.21, this Part, or 35 Ill. Adm. Code 201.142 or 201.143; or

B)        The source is approved to use under any permit issued under 40 CFR 52.21, this Part, or 35 Ill. Adm. Code 201.142 or 201.143;

6)         An increase in the hours of operation or in the production rate, unless such change would be prohibited under any federally enforceable permit condition established after January 6, 1975, under 40 CFR 52.21, this Part, or 35 Ill. Adm. Code 201.142 or 201.143;

7)         Any change in ownership at a stationary source;

8)         The installation, operation, cessation, or removal of a temporary clean coal technology demonstration project, provided that the project complies with:

A)        The Illinois SIP; and

B)        Other requirements necessary to attain and maintain NAAQS during the project and after it is terminated; or

9)         The installation or operation of a permanent clean coal technology demonstration project that constitutes repowering, provided that the project does not result in an increase in the potential to emit of any regulated pollutant emitted by the unit.  This exemption shall apply on a pollutant-by-pollutant basis.

d)         This definition shall not apply with respect to a particular regulated NSR pollutant when the major stationary source is complying with Subpart K for a PAL for that pollutant. Instead, the definition at Section 204.1720 shall apply.