for purposes of this title.
"(C) A unit that cogenerates steam and electricity is not a
`utility unit' for purposes of this title unless the unit is
constructed for the purpose of supplying, or commences
construction after the date of enactment of this title and
supplies, more than one-third of its potential electric output
capacity and more than 25 megawatts electrical output to any
utility power distribution system for sale.
"(18) The term `allowable 1985 emissions rate' means a
federally enforceable emissions limitation for sulfur dioxide or
oxides of nitrogen, applicable to the unit in 1985 or the
limitation applicable in such other subsequent year as determined
by the Administrator if such a limitation for 1985 does not
exist. Where the emissions limitation for a unit is not expressed
in pounds of emissions per million Btu, or the averaging period
of that emissions limitation is not expressed on an annual basis,
the Administrator shall calculate the annual equivalent of that
emissions limitation in pounds per million Btu to establish the
allowable 1985 emissions rate.
"(19) The term `qualifying phase I technology' means a
technological system of continuous emission reduction which
achieves a 90 percent reduction in emissions of sulfur dioxide
from the emissions that would have resulted from the use of fuels
which were not subject to treatment prior to combustion.
"(20) The term `alternative method of compliance' means a
method of compliance in accordance with one or more of the
"(A) a substitution plan submitted and approved in
accordance with subsections 404 (b) and (c);
"(B) a Phase I extension plan approved by the Administrator
under section 404(d), using qualifying phase I technology as
determined by the Administrator in accordance with that
"(C) repowering with a qualifying clean coal technology
under section 409.
"(21) The term `commenced' as applied to construction of any
new electric utility unit means that an owner or operator has
undertaken a continuous program of construction or that an owner
or operator has entered into a contractual obligation to
undertake and complete, within a reasonable time, a continuous
program of construction.
"(22) The term `commenced commercial operation' means to have
begun to generate electricity for sale.
"(23) The term `construction' means fabrication, erection, or
installation of an affected unit.
"(24) The term `industrial source' means a unit that does not
serve a generator that produces electricity, a `nonutility unit'
as defined in this section, or a process source as defined in
"(25) The term `nonutility unit' means a unit other than a
"(26) The term `designated representative' means a responsible
person or official authorized by the owner or operator of a unit
to represent the owner or operator in matters pertaining to the
holding, transfer, or disposition of allowances allocated to a
unit, and the submission of and compliance with permits, permit