The energy offer with a 50% discount may appear in the game at different times and is held with different frequency, just like any other in-game offer.

The launch of this special offer is conditioned by the schedule of special events in the game, which are constantly changing. Some events contain the offer, others don't - that is why it is not always available.
The events that appear in your game are randomly selected from a special list of events. The list of such events is constantly updated and modified so that each player always has an opportunity to go on an exciting adventure.

Hence, the energy discount offer may appear once a day, several times a day, or not appear at all. There is no guarantee that you will get it, so we don't recommend that you rely on it entirely, but rather consider it to be a nice bonus when it appears.