An electrical substation in Knoxville will soon be home to a new project for MidAmerican Energy.
A battery energy storage system—4 megawatt-hours of storage capacity that can supply 1 MW of power for up to four hours—enables electricity to be stored for later use. 1 MW is enough electricity to power about 900 average Iowa homes.
Invenergy will install the lithium-iron phosphate battery system, housed in two truck-sized steel containers. The new system is expected to begin operating by the end of November.
“This innovative project will help us learn how best to use an energy storage system, and how it can serve our customers in the future,” Mike Fehr, MidAmerican Energy vice president of resource development, said. “Energy storage has the potential to allow us to retain energy when customer demand is low and release it during peak usage times. That would give us new options to manage peak loads, enhance overall reliability and help keep electric costs low and affordable for our customers.”