The energy which gets released during the oxidation of compounds in respiration is stored as Adenosine Triphosphate i.e., ATP. The ATP is stored in the form of chemical bonds.
ADP + IP + energy → ATP (ADP = Adenosine Diphosphate and IP = Inorganic phosphorous)
When energy is required then, this bond energy is broken and utilised
ATP → ADP + IP + energy.