The STMicroelectronics UPS System – BESS is a 10,000kW energy storage project located in Phoenix, Arizona, US.

The electro-chemical battery energy storage project uses lead-acid as its storage technology. The project was announced in 1999 and was commissioned in 2000.


The STMicroelectronics UPS System – BESS was developed by STMicroelectronics. The project is owned by STMicroelectronics (100%).

The key application of the project is grid-connected commercial (reliability & quality).

Contractors involved

STMicroelectronics has delivered the battery energy storage project.

Additional information

Pika Energy has been chosen by Green Mountain Power to plan and design Emerald Lake State Park so it will be powered by sunlight, with the Tesla batteries providing backup electricity.

About STMicroelectronics

STMicroelectronics NV (STM) is a semiconductor company. The company develops, manufactures, and markets a wide range of products, including discrete and standard commodity components, custom devices and semi-custom devices and application-specific standard and integrated circuits. It also produces and sells silicon chips and smartcards. STM uses various chip fabrication technologies, including advanced FD-SOI, CMOS, embedded non-volatile memories, RF-SOI, specialized imaging, analog and MEMS, mixed-signal, and smart power processes. It serves customers in various markets, including industrial, automotive, personal electronics, computers, communications equipment, and peripherals. The company has manufacturing sites in Italy, Singapore, France, Morocco, the Philippines, Malta, Malaysia, and China. STM is headquartered in Geneva, Genf, Switzerland.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.