Difference between revisions of "Quantifying GHG Reductions"

Latest revision as of 19:13, 4 November 2021

Definition

Quantifying GHG Reductions is a procedure for compiling and reporting an aggregate GHG reduction from a GHG Project. The following decomposition is according to ^[1]

The standard reporting unit is in tonnes of CO2 Equivalent, denoted as (t CO₂eq)
The total GHG reduction for the i-the project is the sum of annual GHG Project Activity reductions PA_{t, z} for the time horizon T of the project
The time period unit is a year (t)
The project activity index is (z)
The primary effect index of some activity is (p)
The secondary effect index of some activity is (s)

\mbox{GHG Reduction}_i = \sum_t \sum_z \mbox{PAR}_{t, z}

Project Activity Reduction (PAR)

The reduction is decomposed into primary and secondary effects:

\mbox{PAR}_{t, z} = \mbox{PE}_{t, z} + \mbox{SE}_{t, z}

Primary Effects

The total Primary Effects reduction is the delta on absolute reduction from baseline emissions induced by the project activity emissions (PAE):

\mbox{PE}_{t, z} = \sum_p \mbox{BE}_{t, z, p} - \mbox{PAE}_{t, z, p}

Secondary Effects

Secondary effects are correspondingly computed from secondary activity emissions reduction (SAE):

\mbox{SE}_{t, z} = \sum_s \mbox{BE}_{t, z, s} - \mbox{SAE}_{t, z, s}

Baseline Emissions

Baseline and Activity Emissions from primary or secondary effects are computed via emissions factors, e.g.,

\begin{align} \mbox{BE}_{t, z, p/s} &= C_{t, z, p/s} \mbox{EF}_{z, p/s} \\ \mbox{PAE}_{t, z, p} &= C_{t, z, p} \mbox{EF}_{z, p} \\ \mbox{SAE}_{t, z, s} &= C_{t, z, s} \mbox{EF}_{z, s} \\ \end{align}

where

$C_{t, z, p/s}$ is a quantitative measurement of some activity and
$\mbox{EF}_{z, p/s}$ is the corresponding emissions factor

References

↑ The GHG Protocol for Project Accounting, 2005

[1] The GHG Protocol for Project Accounting, 2005

[1]

@@ Line 6: / Line 6: @@
 * The time period unit is a year (t)
 * The project activity index is (z)
-* The primary effect index is (p)
+* The primary effect index of some activity is (p)
-* The secondary effect index is (s)
+* The secondary effect index of some activity is (s)
@@ Line 25: / Line 25: @@
 Secondary effects are correspondingly computed from secondary activity emissions reduction (SAE):
-:<math>\mbox{SE}_{t, z} = \sum_s \mbox{BE}_{t, z, s} - \mbox{SAE}_{t, z, p}</math>
+:<math>\mbox{SE}_{t, z} = \sum_s \mbox{BE}_{t, z, s} - \mbox{SAE}_{t, z, s}</math>
-== Annual Quantification of GHG Reduction ==
-:<math>\mbox{R} = \mbox{BE}  -\mbox{PE}</math>
-Where:
-* <math>\mbox{R}</math> are the Annual GHG reductions for the entire GHG project
-* <math>\mbox{BE}</math> are the total annual baseline emissions for all the GHG project's primary effects
-* <math>\mbox{PE}</math> Total annual GHG project emissions
-== Annual Baseline Emissions ==
+=== Baseline Emissions ===
+Baseline and Activity Emissions from primary or secondary effects are computed via emissions factors, e.g.,
 :<math>
 \begin{align}
-\mbox{BE} &= [\mbox{Process Emissions}] + [\mbox{Combustion Emissions}]  \\
+\mbox{BE}_{t, z, p/s} &=  C_{t, z, p/s}  \mbox{EF}_{z, p/s} \\
-                    & = [C_y \mbox{CF}_b \mbox{EF}_p ] + [C_y \mbox{CF}_b E \mbox{EF}_c]
+\mbox{PAE}_{t, z, p} &=  C_{t, z, p}  \mbox{EF}_{z, p} \\
+\mbox{SAE}_{t, z, s} &=  C_{t, z, s}  \mbox{EF}_{z, s} \\
 \end{align}
 </math>
-== Project Emissions ==
+where
+* <math>C_{t, z, p/s}</math> is a quantitative measurement of some activity and
-:<math>
+* <math>\mbox{EF}_{z, p/s}</math> is the corresponding emissions factor
-\begin{align}
-\mbox{PE} &= [\mbox{Process Emissions}] + [\mbox{Combustion Emissions}]  \\
-                    & = [C_y \mbox{CF}_p \mbox{EF}_p ] + [F_y \mbox{CF}_b \mbox{EC}_c \mbox{EF}_c]
-\end{align}
-</math>
 == See Also ==