Energy-saving mode is a feature found on many electronic devices that helps to conserve energy and reduce power consumption. It is typically activated when the device is not in use for an extended period of time. The two crossword solutions for the term 'energy-saving mode' are 'sleep' and 'lowerpower'. Sleep mode is a type of energy-saving mode that puts the device into a low-power state, while lowerpower mode is a more extreme version of sleep mode that reduces power consumption even further.