I-DEV0309: Deviation of the accuracy of meter from the monitoring plan in the registered PDD

Description of noncompliance with monitoring plan
The deviatioin is about the adjustment of metered data from a meter measuring project emission, because of lower accuracy of meter installed compared with that described in the monitoring plan of the registered PDD. Deloitte-TECO, at verification, realized that the accuracy of meter for monitoring electricity supplied by the project to the grid, which was installed by the grid company, is 0.5s (the maximum error for the meter is 0.5%), while the accuracy of the meter described in the registered PDD is 0.2s (0.2% as maximum error). Therefore, it was concluded that it is defined as deviation, described in the procedures for request for deviation prior to submitting request for issuance, and necessary to correct emission reductions with adjusting metered data. The detailed observations and findings at verification are as follows:

1.The former bidirectional revenure meter with meter accurcy of 0.2s, which is the same as that described in the registered PDD and owned/operated by the grid, was installed before 4 August 2009, the commissioning date of the proposed hydropower station.
2.On 22 September 2009, the former revenue meter with accuracy of 0.2s was replaced with a new bidirectional meter with accuracy of 0.5s which is different from the registered PDD.
3.The changes of meters were conducted by the grid company, who intends to renew them to the latest monitoring equipment within Jian city. It represents that the changes were in accordance with a generally accepted and widely used practice for monitoring of power transmission, and similar power plants connedcted to the grid were to be aligned with the direction of the grid company. It was regarded that this change was not within the control of project participant.
4.It is confirmed that the accuracy of new meter meets the requirement of national standard, “Tech Administrative Code of Electric Energy Metering” (DL/T448-2000). The accuracy level of the revenue meter dropped, as the confidence level in general situation is ±0.2% for 0.2s meter, and ±0.5% for 0.5s meter.
5.Calibration for the Revenue meter, 0.5s, at Grid company was carried out by an authorized organization on 23rd September 2009, and the calibration was in line with the national regulation and requirements. During the monitoring period, no errors of new meter were found, and the meter was within acceptable limits of accuracy.
6.It was deemed that the uncertainty level of the meter was acceptable for the grid company from the national regulation standpoint, and the monitoring system is in compliance with the methodology in the registered PDD, except the meter accuracy, from the standpoint of monitoring and calculation of emission reduction.

Solution to address the noncompliance
As the accuracy of new bidirectional meter for monitoring the electricity supplied from and to the grid is inconsistent with the description in the registered PDD, an adjustment should be made on the maximum permissible error of the meter, and, to be conservative, a deduction in the net electricity supplied to the grid (EGy) is made based on the confidence level of the meter. The data of the Electricity Generation exported to the grid (EGproject, grid), from 04 August 2009 to 22 December 2009, is decreased 0.5% of the meter records and the Electricity Generation imported from the grid (EGgrid, project) is increased 0.5% of the meter records for the same period of time.

The project participant is requesting to be advised by EB whether or not it is possible to use continuously the 0.5s accuracy of meter mentioned in the monitoring report. For the first monitoring period, emission reductions will be recalculated with above-mentioned deduction, if this deviation would be accepted by CDM EB. For the second and subsequent monitoring period for the proposed project activity, any revision of monitoring plan for the permanent change of the accuracy of meter may be required, and DOE, on behalf of PP, will request CDM EB for the approval of revision of the monitoring plan.

1)Corrections of estimates of EGproject, grid
Metered data of EGproject, grid : 5,563.14(MWh)
Corrected metered data of EGproject, grid = Metered data of EGproject, grid * 99.5% = 5,535.3243(MWh)

2)Corrections of estimates of EGgrid, project
Metered data of EGgrid, project : 24.76(MWh)
Corrected metered data of EGgrid, project = Metered data of EGgrid, project * 100.5% = 24.8838(MWh)

3)Corrections of estimates of EGy
EGy = EGproject, grid - EGgrid, project = 5,535.3243(MWh) - 24.8838(MWh) = 5,510.4405(MWh)

4)Emissionn Reductions
ERy = BEy – PEy – Ly, and BEy = EGy * EFy, and PEy – Ly, = 0, thus,
ERy =5,510.4405(MWh) * 0.9735(tCO2e/MWh) = 5364.41(tCO2e)

5)Differennce of emission reduction values between with and without corrections
Emission Reductions without corrections : 5,391.61(tCO2e)
Emission Reductions with corrections : 5364.41(tCO2e)
Difference value : 27.2(tCO2e)

Therefore, the bottomline of the above corrections, as conservative approach, is 5364.41(tCO2e), and it is reduced by 27.2(tCO2e) comparing to the values directly calculated using metered data without correction. The reduced emission reduction will be revised in the final monitoring report.