Organization and Operations	9 Months Ended
Organization and Operations	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operations	Organization and Operations Fluence Energy, Inc., a Delaware corporation (“the Company”), was formed on June 21, 2021. We conduct our business operations through Fluence Energy, LLC and its direct and indirect subsidiaries. Fluence Energy, LLC was formed on June 30, 2017 as a joint venture between Siemens Industry, Inc. (“Siemens Industry”), an indirect subsidiary of Siemens AG (“Siemens”), and AES Grid Stability, LLC (“AES Grid Stability”), an indirect subsidiary of the AES Corporation (“AES”), and commenced operations on January 1, 2018. We refer to Siemens Industry and AES Grid Stability as the “Founders” in this Quarterly Report on Form 10-Q (this “Report”). Fluence Energy, LLC, along with its wholly owned subsidiaries, is primarily engaged in the construction and sale of battery-based energy storage products and providing operational services and artificial intelligence (AI)-enabled digital applications (“Fluence IQ”) for renewables and storage throughout the world, including the Americas, EMEA, and Asia Pacific regions. Except where the context clearly indicates otherwise, “Fluence,” “we,” “us,” “our” or the “Company” refers to Fluence Energy, Inc. and its wholly owned subsidiaries. The Company’s chief operating decision maker (“CODM”) is its Chief Executive Officer. The Company’s CODM reviews financial information on a condensed consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, the Company has determined that it operates in one operating segment, which corresponds to one reportable segment. QFH’s Investment in Fluence Energy, LLC On December 27, 2020, Fluence Energy, LLC entered into an agreement with QIA Florence Holdings LLC (“QFH” or the “Blocker Company”) for a $125.0 million investment. QFH was issued 18,493,275 Class B units of Fluence Energy, LLC. QFH is an affiliate of the Qatar Investment Authority (“QIA”), the sovereign wealth fund of Qatar, and its subsidiaries and affiliates. At September 30, 2021, the investment was recognized at carrying value within mezzanine equity on the consolidated balance sheets. As part of the transactions related to our initial public offering closed on November 1, 2021, QFH elected to convert their Class B units to the common stock of Fluence Energy, Inc., which was a conversion available to all of the holders of Fluence Energy, LLC Class A and Class B units. Accordingly, as of June 30, 2022, no mezzanine equity is recorded on the condensed consolidated balance sheets. Initial Public Offering and Related Transactions On November 1, 2021, the Company completed an initial public offering (the “IPO”) and a series of organization transactions (collectively with the IPO, the “Transactions”), in which the Company issued and sold 35,650,000 shares of its Class A common stock, par value $0.00001 per share (the “Class A common stock”), at the public offering price of $28.00 per share, which includes the exercise by the underwriters of their option to purchase an additional 4,650,000 shares of the Class A common stock. The net proceeds to the Company from the IPO were $935.8 million, after deducting underwriting discounts and offering expenses paid by the Company. Immediately following the consummation of the Transactions: •Fluence Energy, Inc. became a holding company. As the sole managing member of Fluence Energy, LLC, Fluence Energy, Inc. controls the business and affairs of Fluence Energy, LLC and its direct and indirect subsidiaries; •Fluence Energy, Inc. owned, directly or indirectly, 54,143,275 limited liability company interests in Fluence Energy, LLC (the “LLC Interests”), representing approximately 31.6% of the economic interest in Fluence Energy, LLC; •the Founders owned 117,173,390 LLC Interests in Fluence Energy, LLC, representing approximately 68.4% of the economic interest in Fluence Energy, LLC; •the investors in our IPO owned 35,650,000 shares of Class A common stock of Fluence Energy, Inc., representing approximately 65.8% of the economic interest in Fluence Energy, Inc.; •Qatar Holding LLC, the owner of the original Blocker Company, owned 18,493,275 shares of Class A common stock of Fluence Energy, Inc., representing approximately 34.2% of the economic interest in Fluence Energy, Inc.; and •the Founders owned 117,173,390 shares of Class B-1 common stock of Fluence Energy, Inc. Refer to Note 19 - Subsequent Events to the audited consolidated financial statements included in our 2021 Annual Report for a detailed discussion on the IPO and related Transactions. Siemens Industry Redemption On June 30, 2022, Siemens Industry, Inc. exercised its redemption right pursuant to the terms of the Third Amended and Restated Limited Liability Company Agreement of Fluence Energy, LLC (the “LLC Agreement”) with respect to its entire holding of 58,586,695 LLC Interests of Fluence Energy, LLC, together with the corresponding cancellation of an equivalent number of shares of Class B-1 common stock of Fluence Energy, Inc., par value $0.00001 per share (the “Redemption”). The Company elected to settle the Redemption through the issuance of 58,586,695 shares of the Company’s Class A common stock (the “Shares”). The Redemption settled on July 7, 2022. Siemens Industry, Inc. effected an internal transfer of its interest in the Shares to Siemens AG at the time of Redemption and as of June 30, 2022, Siemens AG is the beneficial owner of 58,586,695 shares of Class A common stock. The transaction increased the beneficial ownership interest of the Company in Fluence Energy, LLC to 66.08% as of June 30, 2022. The impact of the change in ownership interest did not result in a change in control. The transaction has been accounted for as an equity transaction and the carrying amount of non-controlling interest has been adjusted. Refer to Condensed consolidated statements of changes in stockholders’ equity, members’ deficit and mezzanine equity included herein.