Ener1 is a company developing energy storage technology building compact lithium-ion-powered batteries for the transportation, utility grid and industrial electronics markets. Headquartered in Indianapolis, Indiana, the company has manufacturing locations in the United States and Korea. Ener1 also develops commercial fuel cell products and nanotechnology-based materials. Ener1 filed for Chapter 11 bankruptcy protection on January 26, 2012. It completed restructuring of its debt and emerged from bankruptcy on March 30, 2012.