Temporal Energy is used to power the Time Machine to visit exotic locations! Each adventure consumes 10 units of Temporal Energy. This energy refills over time. One energy unit refills every 5 minutes. Of course, you can request energy from your friends or purchase it with gold to continue playing without the wait.
You can only purchase energy with Gold or request it from your neighbors when it is not enough to power the Time Machine. When your total energy is below 10, the "Get More!" icon will show up on the energy bar. Click on it to purchase energy or send out energy requests!