In late 2009, Duke announced plans to match a $22m grant from the US Department of Energy (DOE) to install large-scale batteries capable of storing electricity produced by the 153MW Notrees facility.
Xtreme Power, based in Austin, Texas, designed and installed the system, and will continue to operate it.
"Battery storage is an important innovation to address the variability of wind and solar energy generation,”says Duke Energy Renewables president Greg Wolf.
