Carbon Emissions Scoring Tool

The rearchetected system uses updated carbon emissions factors from those in the legacy system. At present this is used only by the Home Energy Scoring tool.

To arrive at the carbon emissions (as CO2) for energy consumed in the user’s house, we multiply the annual energy for each fuel type by the emissions factor for the respective fuel:

emissions = sum (site energy[resource] * carbon_factor[resource])

     where: resource = electric, natural gas, fuel oil, lpg

Table 33 presents the emissions factors for fossil fuels. Natural gas and fuel oil emission factors are derived from U.S. DOE (1994), while the LPG emission factor is from U.S. DOE (1996). Table 34 contains the state level emissions factors for electricity from EPA eGRID 2019 .

Table 33. National Carbon Emission Factors (as CO2) from Residential Fuel Combustion

Fuel

lb. CO2/MBtu

Natural gas 117
LPG 141
Distillate oil 161
 Pellet Wood
 1.613
 Cord Wood
 1.613

Table 34. State Level Electricity Carbon Emissions Factors (as CO2)

StateCarbon Factor (lbs CO2 / kWh)StateCarbon Factor (lbs CO2 / kWh)
AK0.970MT1.253
AL0.782NC0.775
AR1.121ND1.436
AZ0.869NE1.255
CA0.386NH0.251
CO1.323NJ0.543
CT0.474NM1.319
DC0.797NV0.737
DE0.710NY0.377
FL0.874OH1.235
GA0.876OK0.732
HI1.551OR0.397
IA0.855PA0.755
ID0.211RI0.851
IL0.721SC0.535
IN1.624SD0.489
KS0.887TN0.700
KY1.768TX0.910
LA0.824UT1.591
MA0.773VA0.633
MD0.735VT0.041
ME0.205WA0.297
MI1.007WI1.225
MN0.875WV1.930
MO1.587WY2.054
MS0.835