In clay brick manufacturing, energy is required to obtain raw materials and to operate manufacturing
equipment, as well as to extract and refine the fuels used in the brick manufacturing process (i.e., “pre-combustion”
energy). Process energy GHG emissions result from both the direct combustion of fossil fuels and the upstream
emissions associated with electricity use. To estimate process emissions, we first obtained an estimate of the total
energy required to produce one ton of clay bricks, which is reported as 5.1 million Btu.10 Next, we determined the
distribution of fuels that comprise this Btu estimate. Using this information, we then multiplied each fuel’s Btu
estimate by each fuel’s carbon content to obtain carbon dioxide (CO2) emissions for each fuel. The carbon
coefficients we used are presented in Exhibit 4. We then conducted a similar analysis for fugitive CH4 emissions,
using fuel-specific CH4 coefficients. Finally, total process energy GHG emissions were calculated as the sum of
GHG emissions, including both CO2 and CH4, from all the fuel types used in the production of one ton of clay
bricks. The calculations for process energy emissions from manufacturing clay bricks are provided in Exhibit 4.
As the exhibit shows, the process energy for clay bricks results in 0.078 MTCE per ton of clay bricks produced.