The GreenHouse Gas (GHG) footprint of each country is measured from the perspective of a consumer. It represents the GHG footprint of 1 kWh consumed inside a given country, in the g CO2eq unit (meaning each GHG is converted to its CO2 equivalent in terms of global warming potential).
As the imported and exported electricity is considered, each country has a GHG mass flow that depends on neighboring countries. In order to determine the GHG footprint of each country, the set of coupled GHG mass flow balance equations of each countries must be solved simultaneously. This is done by solving the linear system of equations defining the network of GHG exchanges.