Fuel & energy sector

The "Fuel and Energy Sector" or the material and resources that are used to produce power and energy that are used to transform, as the case may be.  This expression also includes electrical energy stored in a battery, the chemical energy stored in food, thermal energy from a hot water heater, or the  kinetic energy of a moving train (heat and mechanical work), and the like, though the expression may have different meanings in different scientific and non-scientific fields.