The lithium-ion battery systems will be installed by the end of 2017 and charged by E.on's 249MW Pyron and 197MW Inadale wind projects in west Texas.
"The batteries will provide system services for the Electric Reliability Council of Texas market, balance out fluctuations across the grid, and improve supply security," E.on said.
E.on is partnering with Greensmith Energy to provide its GEMS software and services to the project.
It follows a previous collaboration at a solar project in Tucson. Arizona.