STMicroelectronics’ Phoenix, AZ facility began the process of researching power protection alternatives for their plant in early 1999. This process culminated with the August 2000 installation of a 12,500-kilvolt-ampere (kVA) uninterruptible power supply (UPS) system operating at 12,470 volts (V), located in the utility substation feeding the plant.

The UPS system at STMicroelectronics in Phoenix utilizes five 2500-kVA energy storage units operating at the utility system voltage of 12,470 V. High-speed power-electronic components are utilized to create these modular energy storage units, which are then combined to produce a large-scale (>1,000 kilowatts) offline UPS system. This off-line system operates only upon the occurrence of a utility system disturbance.

Lead-acid Battery