Energy Races are an online in game event where you compete against other players by spending energy. You can participate in these events by simply spending energy and collecting the necessary points. There are currently 2 different energy races. The Energized Race and Smash Them All.
In the Energized Race, you need to remove any kind of obstacle you can find (bushes, trees, rocks... etc) to collect points.
In Smash Them All race, you need to remove rocks (normal rocks, clay, iron deposits... etc.) to collect points.
When the time is up and the race is over, you will get a reward based on your ranking. Better ranking means more rewards.