An Indiana-based energy-storage company, whose subsidiary received a $118.5 million stimulus grant from the Energy Department, filed for bankruptcy Thursday.

Enera1 is asking a federal bankruptcy court in New York to approve a plan to restructure the company’s debt and infuse $81 million in equity funding.

“This was a difficult, but necessary, decision for our company,” Ener1 CEO Alex Sorokin said in a news release. “We are extremely pleased to have the strong support of our primary investors and lenders to substantially reduce the company’s debt.”