This project, approved by the Arizona Corporation Commission (ACC), will be used to improve service reliability and study how energy storage systems can support the expansion of solar power resources and other renewable energy technologies. A 10 MW lithium nickel-manganese-cobalt (NMC) facility at a TEP substation near Interstate 10 and West Grant Road. The system will be built by NextEra Energy Resources and is expected to be in operation later this year.

The systems will be used primarily to help maintain the required balance between energy demand and supply. Energy storage systems can boost power output levels more quickly than conventional generating resources. If the voltage frequency of the regional electric grid suddenly dropped, power producers like TEP would be required to quickly ramp up output to boost frequency and maintain reliability.

The systems also can help prevent power outages during periods of high energy demand by supporting stable voltage on TEP’s energy delivery system. In the event of an outage, the systems could provide about 5 MW of power for up to an hour. Use of these energy storage systems will help TEP avoid using more expensive generating resources for system disturbances. They also will allow the company to defer costly investments in other system infrastructure.

Lithium Nickel Manganese Cobalt Battery