Sentence:  It was shown that by proper anode design the net energy loss of the arc to the anode could be reduced to approximately 15 % of the total arc <WSD>energy</WSD> A detailed energy balance of the anode was established . 
Meaning of the word marked with <WSD> tags:  (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs