Explanation on how issues raised by the CDM-EB were addressed:
1. The PSB form (F-CDM-PSB) dated 26 February 2013 needs to be
revised and resubmitted with updated information in line with the
revised document for “calculating the grid emission factor of Mauritius”
(version 5 dated 9 April 2014) including any updates that result from
this draft recommendation.
The PSB form (F-CDM-PSB) was submitted that contains updated
information for the calculation of the combined margin grid emission
factor for the island of Mauritius (thereafter called Mauritius). The file is
named “meth_form13 – grid emission factor – DNA – Mauritius – 9 April
2015.docx).
The main change that has been carried out relates to the use of latest
statistics – i.e. generation statistics for 2012, 2013 and 2014. While
updating the statistics, the other comments have been addressed as
explained below. It is pointed out that the previous submission used
generation statistics for the years 2010, 2011 and 2012. In this respect, all
the calculation steps have been reworked.
2. The DNA is requested to submit information on fuel consumption,
electricity generation and date of commission for all of the power units
which consist the grid, indicating the cohort of power units to be
included to calculate the build margin in a manner that allows
complete and transparent identification of both (a) the set of five most
recent power units; and (b) the power units that started to supply
electricity to the grid most recently and that comprise 20% of the
annual electricity generation. This request is based on the following
findings:
a. Under work sheet ‘BM’ of the document titled “Grid EF_ Mauritius
2012 - CM_ 17 February 2014.xls” the total installed capacity of five
While the clarifications sought related to the previous submission, it was
deemed that, given the availability of updated data, it was more
appropriate to redo the calculations based on the new data set. Hence,
some of the comments that were raised are no longer relevant to the
new submission.
The Excel file (Grid Emission Factor of Mauritius 2014 – Combined Margin
– 20 March 2015.xlsx) has now been updated with the inclusion of a new
worksheet labelled ‘list of power plants’ that classifies the park of gridconnected power plants in Mauritius according to fuel combustion, date
of commissioning and whether IPP or the public utility. Where applicable,
the power plants are broken down into their constituent power units.
The workings under STEP 5 in the updated F-CDM-PSB have provided
detailed, step-wise calculations based on the data contained in the ‘list of
power plants’ worksheet to identify the cohort of power plants used for
calculating the build margin emission factor.
Please note that detailed calculations to arrive at the cohort of power
plants included in the build margin are given in the updated F-CDM-PSB.
most recently commissioned power plants total 685,423 GWh
(910,957 GWh including CTDS1), however from the information
submitted it cannot be ascertained how this value comprises at least
20% of the total annual electricity generation of the Island of Mauritius
in year 2012.
b. It is noted that La Nicoliere hydro power plant commissioned in 2010 is
not considered in BM calculation. Please state the reasons for its noninclusion.
c.
Power unit ‘CTSav’ included in the calculation of BM of the document
titled “Grid EF_ Mauritius 2012 - CM_ 17 February 2014.xls” identifies
net electricity generation for year 2012 as 356.855 GWh while the
information provided in “Letter from Central Electricity Board
(reference: CPR/SS) dated 09 April 2014” identifies annual electricity
generation from ‘CTSav’ power unit for year 2012 is 491.7 GWh.
Please note that cell N1 in the ‘list of power plants’ worksheet provides
the total grid generation in 2014 that allows the percentages of electricity
generated by different combinations of power plants to be calculated.
Please note that this hydro power plant is now included in BM
calculation.
As can be seen in the updated Excel file named ‘Grid Emission Factor of
Mauritius 2014 – Combine Margin – 20 March 2015.xlsx’, this confusion
has been resolved. The data in the Excel file have been provided by the
CEB and the verified data for 2012 for CTSav is 491.7 GWh (Coal –
356.855 GWh; bagasse – 134.854 GWh).
d. Values of fuel consumption, in tonnes, which are included in the
updated table 1.7 “Set of 5 power units under consideration” of the
document “calculating the grid emission factor of Mauritius” (updated
17 February 2014) do not correspond with the values for fuels
consumed by plants in the year 2012, in cubic meters, presented
through the letter “calculation and validation of grid emission factor
(GEF) for Mauritius” dated 09 April 2014.
The volume of liquid combustible is converted to the weight basis by
applying the specific density of the fuel that is provided in the CEB letter.
e. Information related to the coal/bagasse power station La Baraque
included in the BM calculation in the updated table 1.7 “Set of 5 power
units under consideration” is not presented through the letter
“calculation and validation of grid emission factor (GEF) for Mauritius”
dated 09 April 2014 nor available elsewhere.
It is pointed out that La Baraque is the SAME power plant as CTSav. The
change took place after a rebranding of the company owning the thermal
power plant. To avoid this confusion, reference to ‘La Baraque’ has been
omitted in the updated F-CDM-PSB.
f.
Disaggregation by power units is provided where the information is
available. Then the definition that is provided in the methodological tool
as to when power units are treated separately or when they are treated
in combination as one power unit is then used in the calculations.
1
Data on electricity generation and fuel consumption for units G1-G2
and units G3-G6 for the Fort Victoria power station are not provided
separately (see document Calculating the Grid Emission Factor of
Mauritius (ENV/PRO/CDM/NGEF) updated 17 February 2014),
whereas in other instances such as the La Baraque power station
power units G1 and G2 are considered as two different power units
(see document F-CDM-PSB dated 26 February 2014).
A power plant/unit is a facility that generates electric power. Several
power units at one site comprise one power plant, whereas a power unit
is characterized by the fact that it can operate independently from other
power units at the same site. Where several identical power units (i.e.
Document “Calculating the Grid Emission Factor of Mauritius” under step 5 to ‘calculate the build margin (BM) emission factor’ does not include the generation from
CTDS (coal) power plant.
with the same capacity, age and efficiency) are installed at one site, they
may be considered as one single power unit.