'Primary energy' is energy contained in raw
fuels and any other forms of energy received by a
system as
input to the system. The concept is used especially in
energy statistics in the course of compilation of
energy balances.
Conversion to secondary energy
Primary energies are transformed in
energy conversion processes to more convenient forms of energy, such as
electrical energy and cleaner
fuels. In energy statistics these forms are called
secondary energy.
See also
★
Energy development
★
Future energy development