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pledged as collateral Long-Term Debt, Current Maturities Schedule of Stock Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Total liabilities and stockholders’ equity Liabilities and Equity Change in estimates Standard Product Warranty Accrual, Change In Estimates Standard Product Warranty Accrual, Change In Estimates Other non-current assets Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Ownership [Domain] Ownership [Domain] Right of use asset - operating leases Operating Lease, Right-of-Use Asset Loss per share of Class A common stock, basic (in usd per share) Earnings Per Share, Basic Peter Williams [Member] Peter Williams Peter Williams, Sell-to-Cover Instruction Trading Arrangement [Member] Peter Williams, Sell-to-Cover Instruction Trading Arrangement Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Sale of Stock [Domain] Sale of Stock [Domain] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Supplier Finance Program, Obligation [Roll Forward] Supplier Finance Program, Obligation [Roll Forward] Current portion of notes receivable - pledged as collateral Accounts Receivable from Securitization Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Arrangement Duration Trading Arrangement Duration Liquidated Damages Liquidated Damages [Abstract] Liquidated Damages Debt Instrument, Covenant, Excess Availability, Line Cap Percentage Threshold Debt Instrument, Covenant, Excess Availability, Line Cap Percentage Threshold Debt Instrument, Covenant, Excess Availability, Line Cap Percentage Threshold Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Restrictions on Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Related Party Related Party [Member] Advance payments Advance Payments, Current Advance Payments, Current Inventory, Current [Table] Inventory, Current [Table] 2026 Purchase Obligation, to be Paid, Year Two Cash paid for income taxes Income Taxes Paid Schedule of Cash and Cash Equivalents [Table] Schedule of Cash and Cash Equivalents [Table] Consolidation Consolidation, Policy [Policy Text Block] 2027 Purchase Obligation, to be Paid, Year Three Total non-current liabilities Liabilities, Noncurrent Investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Termination Date Trading Arrangement Termination Date Letters of credit under the bilateral credit facility (a) Letters of Credit Under the Bilateral Credit Facility [Member] Letters of Credit Under the Bilateral Credit Facility Accounts payable Increase (Decrease) in Accounts Payable Common stock, shares authorized (in shares) Common Stock, Shares Authorized Capitalized software amortization expense Capitalized Computer Software, Amortization Americas (North, Central and South America) Americas [Member] AES Grid Stability AES Grid Stability, LLC [Member] AES Grid Stability, LLC Proceeds from borrowing against note receivable - pledged as collateral Proceeds From Borrowings Against Note Receivable Proceeds From Borrowings Against Note Receivable Guarantees issued Supply Chain Financing Guarantee By Related Party Supply Chain Financing Guarantee By Related Party Total liquidity, line cap, threshold percentage Debt Instrument, Covenant, Total Liquidity, Line Cap Percentage Threshold Debt Instrument, Covenant, Total Liquidity, Line Cap Percentage Threshold Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Outstanding phantom units Phantom Share Units (PSUs) [Member] Asset-Backed Securities, Securitized Loans and Receivables Asset-Backed Securities, Securitized Loans and Receivables [Member] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] All Trading Arrangements All Trading Arrangements [Member] 2024 Purchase Obligation, to be Paid, Remainder of Fiscal Year Surety Program Collateral Surety Program Collateral [Member] Surety Program Collateral All Adjustments to Compensation All Adjustments to Compensation [Member] Award Timing Disclosures [Line Items] Title of Individual [Domain] Title of Individual [Domain] Siemens Industry Siemens Industry, Inc. [Member] Siemens Industry, Inc. Compensation Amount Outstanding Recovery Compensation Amount Comprehensive loss attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Other Commitments [Axis] Other Commitments [Axis] Additional paid-in capital Additional Paid in Capital Executive Officer Executive Officer [Member] Inventory [Axis] Inventory [Axis] Commitment fee threshold percent Debt Instrument, Commitment Fee Per Annum Threshold Percentage Debt Instrument, Commitment Fee Per Annum Threshold Percentage Deferred income taxes Deferred Income Tax Expense (Benefit) Proceeds from exercise of stock options Proceeds from Stock Options Exercised Long-Term Purchase Commitment Long-Term Purchase Commitment [Table Text Block] Cubes, batteries, and other equipment Cubes, Batteries, And Other Equipment [Member] Cubes, Batteries, And Other Equipment 30 month anniversary of IPO Share-Based Payment Arrangement, Tranche Three [Member] Surety bonds Surety Bond [Member] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Adjust Term SOFR Rate, Adjusted EURIBOR Rate, Or Adjusted Term CORRA Rate Adjust Term SOFR Rate, Adjusted EURIBOR Rate, Or Adjusted Term CORRA Rate [Member] Adjust Term SOFR Rate, Adjusted EURIBOR Rate, Or Adjusted Term CORRA Rate Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Class B units issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Insider Trading Arrangements [Line Items] Other Current Assets Other Current Assets [Text Block] Fluence Energy, Inc Fluence Energy, INC [Member] Fluence Energy, INC Maximum Exposure Range for Each Agreement (in $ millions) Contractual Obligation, Exposure Per Agreement Contractual Obligation, Exposure Per Agreement Related Party [Axis] Related Party, Type [Axis] Stock-based compensation expense and related vesting (in shares) Shares Issued, 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Stock Options [Member] Non-Qualified Stock Options Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Adoption Date Trading Arrangement Adoption Date Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Change in estimate of transaction price Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Treasury Stock Treasury Stock, Common [Member] Entity Central Index Key Entity Central Index Key Four Customers Four Customers [Member] Four Customers Non Qualified Stock Option Non Qualified Stock Option [Member] Non Qualified Stock Option Stock-based compensation expense Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Cost Finite-Lived Intangible Assets, Gross Income tax benefit Income tax benefit Income Tax Expense (Benefit) Personnel related liabilities Employee-related Liabilities, Current Vesting [Axis] Vesting [Axis] Number of operating segments Number of Operating Segments Number of suppliers Number of Suppliers Participating in Program Number of Suppliers Participating in Program Name Trading Arrangement, Individual Name Credit Card Program Collateral Credit Card Program Collateral [Member] Credit Card Program Collateral Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Stockholders’ Equity: Equity [Abstract] Inventory, Net Inventory Disclosure [Text Block] Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Receivables from related parties Accounts receivable Other Receivables, Net, Current Entity [Domain] Entity [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Amendment Flag Amendment Flag Intangible Assets, Net Intangible Assets Disclosure [Text Block] Legal Entity [Axis] Legal Entity [Axis] Fluence Energy, LLC Fluence Energy, LLC [Member] Fluence Energy, LLC Increase in borrowing capacity Line of Credit Facility, Increase in Borrowing Capacity Line of Credit Facility, Increase in Borrowing Capacity Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Interest income, net Interest income, net Interest Income (Expense), Net Credit Facility [Domain] Credit Facility [Domain] Equity Interest Type [Axis] Equity Interest Type [Axis] Interest rate Debt Instrument, Basis Spread on Variable Rate Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Damages sought, value Loss Contingency, Damages Sought, Value Goodwill Goodwill Disclosure [Text Block] Borrowings against note receivable - pledged as collateral Long-Term Debt, Excluding Current Maturities Sales and marketing Selling and Marketing Expense [Member] Weighted average number of Class A common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Line cap additional threshold amount Debt Instrument, Covenant, Line Cap Additional Threshold Amount, Total Liquidity Debt Instrument, Covenant, Line Cap Additional Threshold Amount, Total Liquidity Total Accrued Liabilities Patents and licenses Patents And Licensing Agreements [Member] Patents And Licensing Agreements Other Commitment, Total Other Commitment Change in Contract Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Operating expenses: Operating Expenses [Abstract] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Additional Paid-In Capital Additional Paid-in Capital [Member] Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Loss Contingencies [Line Items] Loss Contingencies [Line Items] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Cover [Abstract] Assets and Liabilities, Operating Lease Assets and Liabilities, Lessee [Table Text Block] Assets and Liabilities, Lessee Category of Item Purchased [Axis] Category of Item Purchased [Axis] Subsequent Events Subsequent Events [Text Block] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Amortization of debt issuance costs Amortization of Debt Issuance Costs Capitalized software to be sold Capitalized Software To Be Sold [Member] Capitalized Software To Be Sold Asset-Based Lending Facility Asset-Based Lending Facility [Member] Asset-Based Lending Facility Other non-current liabilities Other Liabilities, Noncurrent Class B-2 common stock Common Class B-2 [Member] Common Class B-2 Consulting Services Revenue Consulting Services Revenue [Member] Consulting Services Revenue Non-NEOs Non-NEOs [Member] Amount of remaining performance obligations Revenue, Remaining Performance Obligation, Amount Number Of Classes Of Common Stock Number Of Classes Of Common Stock Number Of Classes Of Common Stock Provisions for expected project losses Provision for Loss on Contracts Prime Rate Prime Rate [Member] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Effect of Siemens Industry redemption of class B-1 common stock for class A common stock (in shares) Stock Redeemed or Called During Period, Shares Class B-1 common stock Class B-1 common stock Common Class B-1 [Member] Common Class B-1 Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Additions Contract with Customer, Liability, Additions Contract with Customer, Liability, Additions Amount (in $ millions) Contractual Obligation Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted average number of Class A common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Provision for receivables from related parties Receivables, Related Parties, Allowance For Credit Loss Receivables, Related Parties, Allowance For Credit Loss Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Payments for acquisitions Payments of Merger Related Costs, Financing Activities Related Party Transaction [Axis] Related Party Transaction [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Commitment fee Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Statement [Line Items] Statement [Line Items] Outstanding Bank Guarantee Collateral Outstanding Bank Guarantee Collateral [Member] Outstanding Bank Guarantee Collateral Borrowing base amount Debt Instrument, Covenant, Borrowing Base Threshold Debt Instrument, Covenant, Borrowing Base Threshold Effect of remeasurement of non-controlling interest due to other share transactions (in shares) Noncontrolling Interest, Decrease from Remeasurement, Shares Noncontrolling Interest, Decrease from Remeasurement, Shares Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Outstanding borrowings Long-Term Line of Credit Customer relationship Customer Relationships [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage Paid Out Below-Threshold Performance Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage Paid Out Below-Threshold Performance Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage Paid Out Below-Threshold Performance 6 month anniversary of IPO Share-Based Payment Arrangement, Tranche One [Member] Non-Controlling interest Noncontrolling Interest [Member]