 ARLINGTON, Va., Sept. 28, 2021 PRNewswire -- Fluence, The AES Corporations joint venture with Siemens, a leading provider of energy storage products and services and digital applications for renewables and storage, announced today that Fluence Energy, Inc. has filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission SEC relating to a proposed initial public offering of its Class A common stock. 