An uninterruptible power supply (UPS), backup battery or redundant power supply can prevent such circumstances. Usually, an uninterruptible power supply (UPS) provides power during transit. UltraBattery can be used to backup an uninterruptible power supply (UPS). Windows NT 3.1 supports an uninterruptible power supply. For large power units, dynamic uninterruptible power supplies (DUPS) are sometimes used. Uninterruptible power supplies might be incorporated to guard against power failure. In terms of structure, battery storage power plants and uninterruptible power supplies (UPS) are comparable. An uninterruptible power supply (UPS) takes its power from two or more sources simultaneously. An uninterruptible power supply (UPS) can be equipped with maintenance-free capacitors to extend service life. To get uninterruptible and continuous power supply, a diesel-generator back-up system is needed. It will also be suboptimal when used with uninterruptible processes. An uninterruptible sleep state is a sleep state that won't handle a signal right away. If the processes are uninterruptible they will hang and have to be shut down.