When it comes to alternative power during a power outage, an uninterruptible power supply (UPS) provides a seamless transition when the electricity goes out. The most significant difference between a UPS and Generator is the gap in electrical output. The UPS will automatically kick on when the power goes out, which is essential for businesses that rely on electronic devices, such as computers. When the main power goes out, your UPS will automatically activate, allowing you the chance to save your work and continue working if necessary.