Exhibit 21.1

Subsidiaries of Registrant

Entity	Jurisdiction of Organization
A123 Securities Corporation	Massachusetts
A123 Systems (China) Co., Ltd.	China
A123 Systems (China) Materials Co., Ltd.	China
A123 Systems GmbH	Germany
A123 Systems (Zhenjiang) Co., Ltd.	China
A123 Systems Korea Co., Ltd.	Korea
Changchun Farad Electric Co., Ltd.	China
Changchun Guoji Electronic Technology Co., Ltd.*	China
A123 Systems Hong Kong, Ltd.	Hong Kong
Grid Storage Holdings, LLC	Delaware
A123 Systems U.K. Limited	England and Wales

*              13% owned by the Registrant.