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{longname}Q771. What is the difference between the Greenhouse Gas (GHG) emission data reported by electric generating units (EGUs) to EPA's Clean Air Markets Division (CAMD) under Part 75 and to EPA's Greenhouse Gas Reporting Program under Subpart D of Part 98? {longname} |
A771.
...
All
...
EGUs
...
that
...
are
...
required
...
to
...
use
...
Part
...
75
...
to
...
monitor
...
and
...
report
...
carbon
...
dioxide
...
(CO2)
...
mass
...
emissions
...
to
...
EPA
...
year-round
...
must
...
also
...
report
...
annual
...
CO2
...
mass
...
emissions
...
under
...
Subpart
...
D
...
(electricity
...
generation)
...
of
...
Part
...
98.
...
This
...
currently
...
includes
...
only
...
EGUs
...
that
...
are
...
subject
...
to
...
the
...
Acid
...
Rain
...
Program
...
(ARP)
...
and/or
...
the
...
Regional
...
Greenhouse
...
Gas
...
Initiative
...
(RGGI).
...
There
...
is,
...
however,
...
a
...
difference
...
in
...
emissions
...
reported
...
to
...
each
...
program.
...
The
...
ARP
...
and
...
RGGI
...
require
...
reporting
...
of
...
CO2
...
mass
...
emissions
...
only,
...
whereas
...
Subpart
...
D
...
of
...
Part
...
98
...
requires
...
reporting
...
of
...
CO2
...
mass
...
emissions
...
and
...
emissions
...
of
...
methane
...
(CH4)
...
and
...
nitrous
...
oxide
...
(N2O)
...
expressed
...
in
...
terms
...
of
...
CO2
...
equivalent
...
(CO2e)
...
emissions.
...
CO2e
...
emissions
...
are
...
calculated
...
by
...
multiplying
...
the
...
GHG’s mass
...
emissions
...
by
...
its
...
global
...
warming
...
potential
...
(GWP).
...
The
...
GWP
...
is
...
a
...
relative
...
measure
...
of
...
how
...
much
...
heat
...
a
...
GHG
...
traps
...
in
...
the
...
atmosphere.
...
For
...
each
...
calendar
...
year,
...
the
...
same
...
annual
...
CO2
...
mass
...
emissions
...
reported
...
under
...
Part
...
75
...
must
...
also
...
be
...
reported
...
under
...
Subpart
...
D
...
of
...
Part
...
98,
...
except
...
that
...
the
...
Part
...
75
...
data
...
must
...
first
...
be
...
converted
...
from
...
short
...
tons
...
to
...
metric
...
tons.
...
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{info}
Source: M. Hannan, 11/25/2013
Approval / Publishing History: Version 1
Expiration: None
Relevant Subpart/Component: GHG Data and Publication, Subpart D
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