Energy is a measurement in Horse Reality used to restrict the daily activities of the horses. This simulates daily life and ensures they cannot participate in activities infinitely. When you exercise your horse or participate in events, some energy will be drained. The amount of energy drained depends on the activity.
When the energy bar hits 0% the horse has done enough activities for the day. It won't have any consequences.
A horse will regain +10% energy every hour if the horse has been properly taken care of in the last 24 hours. If the horse is thirsty or hungry (caretaking bars [?] filled < 25%) he or she will not regain energy.
There are currently no items that will replenish energy.