The phrase "energy imbalance" refers to a situation where the amount of energy being used or produced is not in equilibrium. It means there is either too much or too little energy compared to what is needed or expected. Full definition
The reason global heat content is increasing is that there is a global energy imbalance caused primarily by the anthropogenic greenhouse gas forcing. (skepticalscience.com)
It is a measure of the consequence of planetary energy imbalance, not the fate of CO2 molecules. (realclimate.org)
Veterinary acupuncture promotes healing by correcting energy imbalances in the body. (vettedpetcare.com)