The Annexes of BEN are stored in the program in spreadsheets for each year. In these spreadsheets the following data are presented for primary and secondary energy sources (columns), corresponding to energy sources in “accounts”:

Data concerning Gross Primary Energy Supply: Production, Imports, Exports, Stock Variation, etc.

Transformation data by type of installation: Refinery, Natural Gas Plants, Electric Power Plants, etc.

Data concerning consumption: Non-energy and Energy consumption by Economic Sectors and some of its activities

Losses and Adjustments

Figure 2.1 illustrates the adopted scheme where we refer to accounts as sectors, for easy understanding.

Figure 2.1: Data from BEN/MME (Annexes) for the available years are used to construct a three-dimensional matrix (energy sources, account or sector and year). The bi-dimensional output is obtained from the original matrix.

The energy values are expressed in ton oil equivalent (toe). The coefficients are presented in tons of gas by toe or equivalent. Emissions are given in 10^3 t/year. The scheme of Figure 2.2 illustrates the adopted methodology.

2.2 The Coefficients

The archives supplied by the MCT gather spreadsheets containing the implicit emission factors of the greenhouse effect gases relative to the energy sector, corresponding to the energy consumption in some transformation sectors and the final energy consumption of the National Energy Balance (BEN).

The emission factors of the following gases are presented: CO2, CH4, N2O, CO, Nitrogen oxides (NOx) and Non-Methane Volatile Organic Compounds (NMVOCs).

The emission factors were calculated using the methodology adopted by the Brazilian Inventory of Greenhouse Effect Gases, namely, the Bottom-Up methodology recommended by the 1996 Revised IPCC Guidelines[i] , developed by the Intergovernmental Panel on Climate Change (IPCC) and adapted to the Brazilian reality. Information from the Energy Balance Information System (SIBE) and the Useful Energy Balance (BEU) were used in its application in order to disaggregate information from BEN. In most of the cases values of different parameters proposed by the IPCC were used. The main exceptions were the conversion factors from toe to Terajoule, the CO2 emission factor of firewood that is consumed in charcoal plants and the emission factors of CO2, CO, CH4 e NOX from ethanol consumed in the transport sector.

The implicit emission factors can vary from year to year since many of them are calculated using more disaggregated information than those presented in the consolidated spreadsheets of BEN.

The presentation format corresponds exactly to the format of the spreadsheets of the National Energy Balance Annex, the Consolidated Balance.

Figure 2.2: Methodology for obtaining emission data used for building tables and graphics.

[i] Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories.

End

Graphic Edition/Edição Gráfica:
MAK
Editoração Eletrônica

Revised/Revisado:
Tuesday, 11 November 2008.

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