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Joint Crediting Mechanism Approved Methodology BD_AM004“Installation of energy-saving conductors for transmission lines in the Bangladesh grid”
A. Title of the methodology
Installation of energy-saving conductors for transmission lines in the Bangladesh grid, Version
01.0
B. Terms and definitions
Terms

Definitions

ACSR (Aluminum Conductor

ACSR is a conductor whose structure consists of the steel

Steel Reinforced), (reference

center strand(s), covered by outer strands of aluminum.

conductors)
HTLS (High-Temperature Low-HTLS are conductors which have less sag at highSag conductors), (projecttemperatures, higher capacity and less energy loss withconductors)

cores made of steel alloys, composite-reinforced metal, orcarbon fiber composite material compared to conventional
ACSR.

C. Summary of the methodology
Items
GHGemission

Summaryreduction Reduction of transmission loss by introduction of HTLS.

measuresCalculationofreference Calculation of GHG emissions due to transmission loss inemissions

ACSR, based on the parameters derived from ASTM
International Standard B232 (Standard Specification forACSR).

Calculationofproject GHG emissions due to transmission loss in HTLS, based onemissions

monitored transmission loss.

Monitoring parameters

Power sent from the point of origin/supply to the transmissionline, power received at the point of end/receipt of thetransmission line.

D. Eligibility criteria1

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This methodology is applicable to projects that satisfy all of the following criteria.
The transmission line constitutes of a single or double circuit(s) directly
Criterion 1

connecting a substation and another substation within the country with nobranching in between, and does not constitute a part of a loop.
The type of conductor used by the project is the family of HTLS, which

Criterion 2includes heat-resistant aluminum alloys or materials whose high temperatures
have been mitigated by reinforced conductors (see Section B).

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Transmission loss in reference conductors

CO2

Project emissions
Emission sources

GHG types

Transmission loss in project conductors

CO2

F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
Reference emissions (REp) are calculated by multiplying transmission loss in ACSR(LOSSRF,L,p) by the emission factor of the grid (EFGrid). The LOSSRF,L,p is derived by multiplying
the project transmission loss in HTLS (LOSSPJ,L,p) by the ratio of direct current (DC) resistance
between ACSR and HTLS.
To ensure conservativeness in establishing the reference emissions to achieve net emission
reductions, the following assumptions are applied:-The ratio of DC resistance between ACSR and HTLS, instead of the ratio of alternativecurrent (AC) resistance, is used because the ratio of DC resistance is smaller than thatof AC resistance under the standard condition.

-The same temperature at 20 deg. C. is assumed for the ACSR and HTLS to calculate
the ratio of DC resistance between ACSR and HTLS. This ratio of direct current
resistance derived at 20 deg. C. is smaller than the ratio at the actual temperature (theactual temperature of ACSR conductors would be higher than that of HTLS at the same2

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ambient temperature due to higher resistance of ACSR).
-The default value of DC resistance of ACSR (reference transmission line, RdcRF,L) is
set by discounting by 2% the direct current resistance of ACSR code in ASTM
International Standard B232 for the same overall diameter used in Bangladesh. The
diameter of each strand of the reference conductor is assumed 1% larger than its
specification, which is the maximum allowable tolerance of major international
standard such as the International Electrotechnical Commission (IEC), resulting in 2%
increase in cross-sectional area and thus 2% reduction in resistance (the value ofresistance is inversely proportional to that of the cross-sectional area).

F.2. Calculation of reference emissionsReference emissions are calculated by the following equation.
RE௣ = ∑௅൫LOSSRF,L,p × EFGrid ൯LOSSୖ୉,୐,୮ = LOSS୔୎,୐,୮ ×Where
REp=LOSSRF,L,p =EFGrid=LOSSPJ,L,p=

RDC_RF,L=R DC_PJ,L=(1)

RDC,_RE,L
RDC_PJ,L(2)

Reference emissions during the period p [tCO2/p]
Reference transmission loss at transmission line L during the period p[MWh/p]CO2 emission factor of the grid [tCO2/MWh]
Project transmission loss at transmission line L during the period p[MWh/p]
Direct current resistance of transmission line L using reference ACSR(@20 deg. C) [Ω/km]
Direct current resistance of transmission line L using HTLS (@20 deg. C)[Ω/km]

G. Calculation of project emissions
Project emissions are calculated by multiplying transmission loss in the project (LOSSPJ,L,p) by
the CO2 emission factor of the grid (EFGrid).

PE௣ = ∑௅൫LOSSPJ,L,p × EFGrid ൯(3)3

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LOSSPJ,L,p = ‫ܧ‬L,send,p − EL,receive,p(4)WherePEp=

LOSSPJ,L,p =EL,send,p=EL,receive,p=EFGrid=Project emissions during the period p [tCO2/p]
Project transmission loss at transmission line L during the period p[MWh/p]
Power sent from the point of origin/supply to the transmission line Lduring the period p [MWh/p]
Power received at the point of receipt of the transmission line L during
the period p [MWh/p]
CO2 emission factor of the grid [tCO2/MWh]

H. Calculation of emissions reductions

Emission reductions are calculated by the following equation.

ER ௣ = RE௣ − PE௣(5)WhereERp=Emission reduction during the period p [tCO2/p]

REp=Reference emission during the period p [tCO2/p]

PEp=Project emission during the period p [tCO2/p]

I. Data and parameters fixed ex ante
The source of each data and parameter fixed ex ante is listed as below.
Parameter

Description of dataSource

R DC_PJ,L

Direct current resistance of transmission line L

Measured according to IEC

using HTLS (@20 deg. C) [Ω/km]

60468 (Method ofmeasurement of resistivity ofmetallic materials).

R DC_RF,,L

Direct current resistance of transmission Line L

Based on ASTM

using reference ACSR (@20 deg. C) [Ω/km]

International Standard B232

Reference value is calculated by discounting 2%of the direct current resistance of a type of
ACSR of which specified in ASTM International
Standard B232 which has same overall diameteras one of project HTLS.
Example of default R DC_RE,L Value:4

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ASCR
CodeFlamingo
Mallard
Cardinal

EFGridOveralldiameter
(mm)
25.34
28.96
30.42

R DC_RF,,L (Directcurrent resistance@20 deg. C) (Ω/km)
0.08380.07020.0584

For transmission loss in both reference andThe most recent value

project scenario, the most recent emission factor

available at the time ofof Bangladesh grid [tCO2/MWh] available at thevalidation is applied andtime of validation.

fixed for the monitoring
period thereafter.
The data is sourced from
“Grid Emission Factor (GEF)of Bangladesh”, endorsed by
National CDM Committee
unless otherwise instructedby the Joint Committee.

History of the document
Version01.0

Date
4 January 2023

Contents revisedElectronic decision by the Joint Committee
Initial approval.

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