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STOCKHOLDERS AGREEMENT JOINDER

The undersigned is executing and delivering this joinder agreement (“Joinder Agreement”) pursuant to the Stockholders Agreement, dated as of October 27, 2021, by and among Fluence Energy, Inc., a Delaware corporation (the “Corporation”), and the other parties thereto, as amended and restated, restated, amended, supplemented or otherwise modified from time to time (the “Stockholders Agreement”). Capitalized terms used, but not defined, in this Joinder Agreement shall have the meanings ascribed to them in the Stockholders Agreement.

The undersigned hereby joins and enters into this Joinder Agreement having acquired shares of Class A Common Stock as a Permitted Transferee of Siemens AG, a party to the Stockholders Agreement. By executing and delivering to the Corporation this Joinder Agreement, the undersigned hereby agrees to become a party to the Stockholders Agreement, to succeed to all of the rights and obligations of a “Stockholder” and an “Siemens Related Party” and to be fully bound by, and subject to, all of the covenants, terms and conditions of the Stockholders Agreement as though an original party thereto.

Accordingly, the undersigned has executed and delivered this Joinder Agreement as of the 14th day of October, 2025.

[Signature Pages Follow]

By: /s/ Gruenewald Thomas

Name: Gruenewald Thomas

By: /s/ Stoffel Denis

Agreed and Accepted as of

FLUENCE ENERGY, INC.

By: /s/ Vincent W. Mathis

Name: Vincent W. Mathis

Title: SVP, Chief Legal and Compliance