Invenergy LLC, a closely held renewable-energy developer, is installing Xtreme Power Inc.’s storage systems at an Illinois wind farm to provide electricity when the wind isn’t blowing.

The Grand Ridge wind farm in La Salle County, southwest of Chicago, will use lithium-titanate batteries capable of storing 1.5 megawatts of power, Invenergy said today in a statement.

The storage system will let Chicago-based Invenergy “balance supply and demand” on the grid operated by PJM Interconnection LLC, according to the statement. Terms weren’t disclosed.

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