Commission Implementing Regulation (EU) 2018/2066Show full title

ANNEX VIII Measurement-based methodologies (Article 41)

1. TIER DEFINITIONS FOR MEASUREMENT-BASED METHODOLOGIES

Measurement-based methodologies shall be approved in accordance with tiers with the following maximum permissible uncertainties for the annual average hourly emissions calculated in accordance with Equation 2 set out in section 3 of this Annex.

Table 1

Tiers for CEMS (maximum permissible uncertainty for each tier)

In case of CO2, the uncertainty is to be applied to the total amount of CO2 measured. Where the biomass fraction is determined using a measurement based methodology, the same tier definition as for CO2 shall be applied to the biomass fraction.
	Tier 1	Tier 2	Tier 3	Tier 4
CO2 emission sources	± 10 %	± 7,5 %	± 5 %	± 2,5 %
N2O emission sources	± 10 %	± 7,5 %	± 5 %	N.A.
CO2 transfer	± 10 %	± 7,5 %	± 5 %	± 2,5 %

2. MINIMUM TIER REQUIREMENTS FOR CATEGORY A INSTALLATIONS

Table 2

Minimum tiers to be applied by category A installations for measurement-based methodologies in accordance with point (a) of Article 41(1)

Greenhouse gas	Minimum tier level required
CO2	2
N2O	2

3. DETERMINATION OF GHGS USING MEASUREMENT-BASED METHODOLOGIES

Equation 1: Calculation of annual emissions in accordance with Article 43(1):

Equation 2: Determination of average hourly emissions:

Equation 2a: Determination of average hourly GHG concentration for the purpose of reporting in accordance with point 9(b) of Annex X, section 1:

Equation 2b: Determination of average hourly flue gas flow for the purpose of reporting in accordance with point 9(b) of Annex X, section 1:

Equation 2c: Calculation of annual emissions for the purpose of the annual emission report in accordance with point 9(b) of Annex X, section 1:

The following abbreviations are used in Equations 1 to 2c:

The index i refers to the individual operating hour. Where an operator uses shorter reference periods in accordance with Article 44(1), that reference period shall be used instead of hours for these calculations.

GHG Em_total

=

total annual GHG emissions in tonnes

GHG conc_{hourly, i}

=

hourly concentrations of GHG emissions in g/Nm³ in the flue gas flow measured during operation for hour i;

V_{hourly, i}

=

flue gas volume in Nm³ for hour i (i.e. integrated flow over the hour or shorter reference period);

GHG Em_average

=

annual average hourly emissions in kg/h from the source;

HoursOp

=

total number of hours for which the measurement-based methodology is applied, including the hours for which data has been substituted in accordance with Article 45(2) to (4);

GHG conc_average

=

annual average hourly concentrations of GHG emissions in g/Nm³;

Flow_average

=

annual average flue gas flow in Nm³/h.

4. CALCULATION OF THE CONCENTRATION USING INDIRECT CONCENTRATION MEASUREMENT

Equation 3: Calculation of the concentration

5. SUBSTITUTION FOR MISSING CONCENTRATION DATA FOR MEASUREMENT-BASED METHODOLOGIES

Equation 4: Substitution for missing data for measurement-based methodologies

Where:

=

the arithmetic mean of the concentration of the specific parameter over the whole reporting period or, where specific circumstances applied when data loss occurred, an appropriate period reflecting the specific circumstances;

σ _{C_}

=

the best estimate of the standard deviation of the concentration of the specific parameter over the whole reporting or, where specific circumstances applied when data loss occurred, an appropriate period reflecting the specific circumstances.