Document And Entity Information
Statistical Measurement [Axis]
Note To Financial Statement Details Textual
Significant Accounting Policies
Note 3 - Summary of Significant Accounting Policies
Income Taxes
Income taxes
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Note 4 - Fair Value Measurements
Minority Buyer [Member]
Represents the minority buyer.
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Note 6 - Formation of EverOn Energy Joint Venture and Consolidation of Variable Interest Entity
Trading Arrangements, by Individual [Table]
Note 7 - Prepaid Expenses and Other Current Assets
Material Terms of Trading Arrangement [Text Block]
Note 8 - Capitalized Cost and Other Long-term Assets
Note 9 - Accounts Payable
Note 10 - Accrued Liabilities
Note 11 - Taxes Recoverable and Payable
Note 12 - Convertible and Non-Convertible Promissory Notes
Minimum [Member]
Note 16 - Discontinued Operations Sold - Poland and Netherlands
Note 17 - Sale of Spanish Subsidiaries
us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Gain on foreign currency exchange rates
Statistical Measurement [Domain]
Note 18 - Sale of Assets Held for Sale MH 02 and its Subsidiaries
Maximum [Member]
us-gaap_SharePrice
Share Price (in dollars per share)
Note 19 - Shareholders' Equity
Note 20 - Segment and Geographic Information
Note 22 - Related Party
Shares Issued for Joint Venture Agreement (in shares)
Number of shares of stock issued attributable to joint venture agreement.
Litigation Case [Domain]
Note 3 - Summary of Significant Accounting Policies - Summary of Antidilutive Securities (Details)
Note 4 - Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
us-gaap_MinorityInterestInJointVentures
Noncontrolling Interest in Joint Ventures
Note 4 - Fair Value Measurements - Summary of Fair Value Assumptions (Details)
Note 4 - Fair Value Measurements - Schedule of Fair Value Liabilities With Unobservable Inputs (Details)
Note 6 - Formation of EverOn Energy Joint Venture and Consolidation of Variable Interest Entity - Schedule of Consideration Transferred (Details)
Shares Issued for Joint Venture Agreement
Value of shares of stock issued attributable to joint venture agreement.
Note 6 - Formation of EverOn Energy Joint Venture and Consolidation of Variable Interest Entity - Schedule of Consideration Transferred (Details) (Parentheticals)
Note 6 - Formation of EverOn Energy Joint Venture and Consolidation of Variable Interest Entity - Assets Acquired (Details)
Note 6 - Formation of EverOn Energy Joint Venture and Consolidation of Variable Interest Entity - Pro Forma Information (Details)
Note 7 - Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details)
Note 8 - Capitalized Cost and Other Long-Term Assets - Schedule of Capitalized Development Costs and Other Long-Term Assets (Details)
Note 9 - Accounts Payable - Schedule of Accounts Payable (Details)
Note 10 - Accrued Liabilities - Schedule of Accrued Liabilities (Details)
Note 11 - Taxes Recoverable and Payable - Schedule of Taxes Recoverable (Details)
Note 12 - Convertible and Non-Convertible Promissory Notes - Convertible Notes (Details)
Note 12 - Convertible and Non-Convertible Promissory Notes - Schedule of Debt (Details)
Note 16 - Discontinued Operations Sold- Poland and Netherlands - Summary of Disposal Group Income Statement (Details)
Note 17 - Sale of Spanish Subsidiaries - Summary of Assets and Liabilities in Sale of Subsidiary (Details)
Note 18 - Sale of Assets Held For Sale MH 02 And Its Subsidiaries - Summary of Assets and Liabilities in Sale of Subsidiary (Details)
Note 19 - Shareholders' Equity - Summary of Warrant Activity (Details)
Counterparty Name [Axis]
Note 20 - Segment and Geographic Information - Schedule of Segment Information (Details)
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent
Note 22 - Related Party - Schedule of Director's Remuneration (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Business Combination [Member]
Related to business combination.
SAA Settlement [Member]
Related to SAA settlement.
Litigation Case [Axis]
Counterparty Name [Domain]
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Noncash Transaction [Member]
Related to noncash transaction.
alce_DevelopmentCost
Development Cost
The value of development cost.
Segment Reporting [Text Block]
Foreign Currency Translation Reserve [Member]
Represents the foreign currency translation reserve.
us-gaap_ContractualObligation
Contractual Obligation
Segment Reporting [Table Text Block]
Adjustments to reconcile loss from continuing operations to net cash provided by/(used in) operations:
Preferred stock
Shares Returned on Recission of Liion Acquisition (in shares)
Represents the number of shares returned on the rescission of a business acquisition.
Plan Name [Axis]
Total liabilities
Total Liabilities
Total liabilities
Plan Name [Domain]
Shares issued for Debt Issuance Costs
Represents the value of shares of stock issued during period that were issued for debt issuance costs.
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Shares Returned on Recission of Liion Acquisition
Represents the value of shares returned on the rescission of a business acquisition during the period.
Shares issued for Debt Issuance Costs (in shares)
Represents the number of shares issued during the period for debt issuance costs.
us-gaap_WarrantsAndRightsOutstandingTerm
Warrants and Rights Outstanding, Term (Year)
us-gaap_LossContingencyDamagesAwardedValue
Loss Contingency, Damages Awarded, Value
us-gaap_AllocatedShareBasedCompensationExpense
Share-Based Payment Arrangement, Expense
us-gaap_LiabilitiesAndStockholdersEquity
Total Liabilities and Shareholder’ Equity (Deficit)
Settlement of Payables for Shares (in shares)
Represents the number of shares issued for settlement of payables during the period.
Business Combination Agreement [Member]
Represents the business combination agreement.
Title and Position [Axis]
Segment Reporting [Table]
Settlement of Payables for Shares
Represents the value of stock issued during the period for the settlement of payables.
Total liabilities sold
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
Project [Axis]
Stock compensation costs
us-gaap_SellingGeneralAndAdministrativeExpense
Selling, general and administrative
Subsequent Event [Member]
Development costs
Development costs
Liability for Future Policy Benefit, by Product Segment [Table]
Changes in assets and liabilities, net of effects of acquisitions:
Accounts payable
us-gaap_IncreaseDecreaseInAccountsPayable
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued (in shares)
Finite lived intangible assets, useful life (Year)
us-gaap_FiniteLivedIntangibleAssetUsefulLife
Finite-Lived Intangible Asset, Useful Life (Year)
Europe [Member]
Preferred stock, shares oustanding (in shares)
Preferred Stock, Shares Outstanding (in shares)
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share (in dollars per share)
Accrued liabilities
us-gaap_IncreaseDecreaseInAccruedLiabilities
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase/(decrease) in cash, cash equivalents and restricted cash
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance
Balance
Series A Preferred Stock [Member]
Related party
us-gaap_IncreaseDecreaseInDueToRelatedParties
Effect of exchange rate on cash
us-gaap_OtherExpenses
Other expense
alce_ConsultingAgreementInitialTerm
Consulting Agreement, Initial Term (Year)
Represents the initial term of a consulting agreement.
Rescission [Text Block]
Represents the entire disclosure of a rescission.
MH02 Note [Member]
Related to MH02 Note.
Capitalized Development and Other Long-Term Assets [Text Block]
Represents the entire disclosure of capitalized development and other long-term assets during the period.
Prepaid Expenses and Other Current Assets [Text Block]
Represents the entire disclosure of prepaid expenses and other current assets during the period.
Convertible Notes, April 2024 [Member]
Represents the April 2024 convertible notes.
New Accounting Pronouncements, Policy [Policy Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents, and restricted cash beginning of the year
Cash, cash equivalents, and restricted cash end of the period
Convertible Note [Member]
Represents convertible note.
Convertible Notes, October 2024 [Member]
Represents the October 2024 convertible notes.
Taxes Recoverable and Payable [Text Block]
Represents the entire disclosure of taxes recoverable and payable during the period.
Antidilutive Securities, Name [Domain]
us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Debt Instrument, Convertible, Threshold Consecutive Trading Days
Comprehensive income / (loss):
alce_TaxesRecoverableAndPayable
Total
Represents the amount of taxes recoverable and payable.
Statement [Table]
Schedule of Taxes Recoverable and Payable [Table Text Block]
Represents the tabular disclosure of the schedule of taxes recoverable and payable during the period.
Operating Activities [Axis]
Continuing Operations [Member]
Adjusted EBITDA
The amount of adjusted earnings before interest, taxes, depreciation and amortization.
Accrued consulting fees
Represents the current portion of accrued consulting fees.
Discontinued Operations [Member]
alce_ObligationToPurchaseProjectAtMarketValueMinimumPerMegawatt
Obligation to Purchase Project at Market Value, Minimum Per Megawatt
The amount of obligation to purchase project at market value, minimum per megawatt.
Additional Investment [Member]
Related to additional investment.
Operating Activities [Domain]
Other Payables [Text Block]
Represents the entire disclosure of other payables.
Promissory Note [Member]
Represents a promissory note.
Fair Value, off-Balance-Sheet Risk [Table]
Development Costs [Text Block]
Represents the entire disclosure for development costs during the period.
Group of Private Lenders [Member]
Represents a debt instrument with a group of private lenders.
Long-term prepaid expenses
Solar PV Projects in Spain [Member]
Represents the solar pv projects in Spain.
Alternus Energy Americas [Member]
Represents Alternus Energy Americas.
Working Capital Loan [Member]
Represents a working capital loan.
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
Senior Convertible Note [Member]
Represents a senior convertible note.
Alt Spain Holdco [Member]
Represents Alt Spain Holdco.
us-gaap_GainLossOnSaleOfBusiness
Gain (Loss) on Disposition of Business
Bank Facility [Member]
Represents a bank facility.
Line of Credit Facility, Lender [Domain]
us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Ownership Percentage
Maxim Group LLC [Member]
Represents Maxim Group LLC.
Derivative Warrant Liability
alce_OutOfPocketFeesReimbursed
Out of Pocket Fees Reimbursed
Represents the number of out of pocket fees reimbursed during the period.
alce_CommonStockConvertiblePercentageOfOutstandingCommonStock
Common Stock, Convertible, Percentage of Outstanding Common Stock
Represents the percentage of outstanding common stock used with convertible common stock.
Lender Name [Axis]
Long-Term Debt, Type [Axis]
Stock Compensation for Third Party Services
Stock Issued During Period, Value, Issued for Services
Stock Compensation for Third Party Services (in shares)
Stock Issued During Period, Shares, Issued for Services (in shares)
Ownership [Axis]
us-gaap_LegalFees
Legal Fees
Ownership [Domain]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
us-gaap_RepaymentsOfDebt
Repayments of Debt
Payments of debt principal
us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Accounts receivable and other short-term receivables
Proceeds from debt
Proceeds from Issuance of Debt
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
Measurement Frequency [Axis]
Commitments and Contingencies Disclosure [Text Block]
Statement [Line Items]
Liability Class [Axis]
Fair Value Hierarchy and NAV [Axis]
Common stock, shares issued (in shares)
Common Stock, Shares, Issued (in shares)
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding (in shares)
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized (in shares)
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Schedule of Accrued Liabilities [Table Text Block]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
us-gaap_ExtinguishmentOfDebtGainLossNetOfTax
Extinguishment of Debt, Gain (Loss), Net of Tax
us-gaap_ExtinguishmentOfDebtAmount
Extinguishment of Debt, Amount
Common stock, $0.0001 par value, 600,000,000 authorized as of September 30, 2025 and 300,000,000 authorized as of December 31, 2024; 690,283 issued and outstanding as of September 30, 2025 and 25,189 issued and outstanding as of December 31, 2024.
Proceeds from issuance of share capital
Proceeds from Issuance or Sale of Equity
Finite lived intangible assets, annual amortization
Finite-Lived Intangible Asset, Expected Amortization, Year One
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)
us-gaap_InterestPayableCurrentAndNoncurrent
Interest Payable
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]
Accounts payable
Accounts Payable, Current
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_TableTextBlock
Notes Tables
us-gaap_ProceedsFromIssuanceOfWarrants
Proceeds from Issuance of Warrants
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive income/(loss)
us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets
Stock Issued During Period, Shares, Purchase of Assets (in shares)
Accrued payroll
Accrued legal
Subsequent Events [Text Block]
us-gaap_AccruedLiabilitiesCurrent
Total
Accrued liabilities
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]
Significant Accounting Policies [Text Block]
us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger
Non-cash operating lease assets
Operating lease liability, net of current portion
Schedule of Related Party Transactions [Table Text Block]
Other accrued expenses
Operating lease liability
alce_NumberOfSharesUsedToDetermineConversionPrice
Number of Shares Used to Determine Conversion Price (in shares)
Represents the number of shares used to determine the conversion price of a convertible instrument.
The Two Thousand and Twenty Four Notes [Member]
Represents the 2024 notes.
Accrued interest
us-gaap_LongTermDebtCurrent
Current Maturities net of debt discount
Taxes payable
Less: Taxes payable
us-gaap_LongTermDebtNoncurrent
Long-term maturities net of debt discount
alce_DiscountRateOnFeesAndOtherExpenses
Discount Rate on Fees and Other Expenses
Represents the discount rate on fees and other expenses.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
alce_DebtInstrumentInterestRateInEventOfDefault
Debt Instrument, Interest Rate in Event of Default
Represents the interest rate of a debt instrument in the event of default.
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Fourth Tranche [Member]
Represents the fourth tranche.
Debt
Long-Term Debt
Third Tranche [Member]
Represents the third tranche.
Movement in fair value
Movement in fair value
Second Tranche [Member]
Represents the second tranche.
us-gaap_LossContingencyAccrualAtCarryingValue
Loss Contingency Accrual
Convertible notes measured at fair value
Loss Contingencies [Table]
Intangible Asset, Finite-Lived, Class [Axis]
Statement of Stockholders' Equity [Abstract]
Intangible Asset, Finite-Lived, Class [Domain]
Class of Warrant or Right [Axis]
Statement of Cash Flows [Abstract]
Class of Warrant or Right [Domain]
Foreign currency translation adjustment
us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Foreign currency translation adjustment
us-gaap_ConvertibleNotesPayable
Convertible Notes Payable
Convertible Debt [Member]
Shareholders’ Deficit
Long-Term Debt, Type [Domain]
Equity Components [Axis]
us-gaap_LossContingencyEstimateOfPossibleLoss
Loss Contingency, Estimate of Possible Loss
Operating lease liabilities
Share-Based Payment Arrangement [Policy Text Block]
Equity Component [Domain]
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
Equity [Text Block]
Fair Value, Inputs, Level 1 [Member]
us-gaap_ClassOfWarrantOrRightOutstanding
Class of Warrant or Right, Outstanding (in shares)
Outstanding, warrants (in shares)
Outstanding, warrants (in shares)
Additional Paid-in Capital [Member]
Retained Earnings [Member]
alce_DebtInstrumentOriginalIssueDiscountPercentageIncrease
Debt Instrument, Original Issue Discount, Percentage Increase
Represents the percentage increase of the original issue discount of a debt instrument.
Note Purchase Agreement, 2025 Note [Member]
Represents the 2025 note purchase agreement.
us-gaap_CostOfGoodsAndServicesSold
Cost of revenues
Note Purchase Agreement [Member]
Represents a note purchase agreement.
alce_DebtInstrumentOriginalIssueDiscount
Debt Instrument, Original Issue Discount
Represents the original issue discount percentage related to a debt instrument during the period.
alce_DebtInstrumentConversionPriceCommonStockVwapRate
Debt Instrument, Conversion Price, Common Stock Vwap Rate
Represents the common stock VWAP rate related to the conversion price of a debt instrument.
Secure Net Capital LLC [Member]
Represents Secure Net Capital LLC.
Bess LLC [Member]
Represents Bess LLC.
us-gaap_SettlementLiabilitiesCurrent
Settlement Liabilities, Current
alce_DebtInstrumentRepaymentPremiumPercentage
Debt Instrument, Repayment Premium Percentage
Represents the repayment premium percentage of a debt instrument.
Alternus Europe Ltd [Member]
Represents Alternus Europe Ltd.
SCAF and CLIN Business Combination [Member]
Represents the SCAF and CLIN business combination.
alce_DebtInstrumentBusinessCombinationAmountSettled
Debt Instrument, Business Combination, Amount Settled
Represents the amount of a debt instrument related to a business combination settled during the period.
Placement Agent Warrants [Member]
Represents placement agent warrants.
Subsequent Event Type [Domain]
us-gaap_ProvisionForDoubtfulAccounts
Provision for loss from related party
Provision for loss from related party
alce_ProceedsOfGrossProceedsReceived
Proceeds of Gross Proceeds Received
Represents the proceeds of gross proceeds received during the period.
Investor Promissory Notes [Member]
Represents investor promissory notes.
Subsequent Event [Table]
Meteora Capital LLC [Member]
Represents Meteora Capital LLC.
Subsequent Event Type [Axis]
alce_OriginalIssueDiscountAndDefaultInterest
Original Issue Discount and Default Interest
Represents the amount of the original issue discount and default interest reported during the period.
Securities Purchase Agreement [Member]
Represents a securities purchase agreement.
Sale of Stock [Axis]
Second Investor Promissory Note [Member]
Represents the second investor promissory note.
Second Partial Tranche [Member]
Represents the second partial tranche.
Credit loss expense
Sunrise Development LLC [Member]
Represents Sunrise Development LLC.
SPAC Sponsor Capital Access [Member]
Represents SPAC sponsor capital access.
Subsidiary of LLC or LP [Table]
alce_ContractualObligationAmountOfMonthlyPayment
Contractual Obligation, Amount of Monthly Payment
Represents the amount of monthly payment related to a contractual obligation.
CFGI LP [Member]
Represents CFGI LP.
Southern Point Capital Corporation [Member]
Represents Southern Point Capital Corporation.
Fair Value Option, Disclosures [Table]
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Table]
Orrick [Member]
Represents Orrick.
Restricted Common Stock [Member]
Represents restricted common stock.
alce_SettlementAgreementBeneficialOwnershipPercentageOfCommonStock
Settlement Agreement, Beneficial Ownership Percentage of Common Stock
Represents the beneficial ownership percentage of common stock used in a settlement agreement.
Hover Energy LLC [Member]
Represents Hover Energy LLC.
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Foreign currency translation reserve
Substantial Doubt about Going Concern [Text Block]
Liability for Future Policy Benefit Activity [Table]
alce_DisposalGroupNumberOfParksSold
Disposal Group, Number of Parks Sold
Represents the number of parks sold related to a disposal group.
Current Liabilities
us-gaap_LiabilitiesCurrent
Total Current Liabilities
Income/(loss) from discontinued operations
Income/(loss) from discontinued operations
alce_DisposalGroupCostsAssociatedWithSale
Disposal Group, Costs Associated With Sale
Represents the costs associated with the sale of a disposal group.
alce_DisposalGroupPercentageOfGroupfRevenuesAccountedFor
Disposal Group, Percentage of Group Revenues Accounted For
Represents the percentage of revenues a disposal group accounted for during the period.
Solis Bond Company DAC [Member]
Represents Solis Bond Company DAC.
Product Liability Contingency [Table]
Taxes
Tax Credit Carryforward [Table]
us-gaap_LitigationSettlementExpense
Litigation Settlement, Fee Expense
us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net Cash provided by/(used in) Financing Activities
us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net Cash provided by/(used in) Investing Activities
us-gaap_GainLossOnDispositionOfAssets1
(Gain)/loss on disposal of assets
Customer Relationships [Member]
Net Cash provided by/(used in) Financing Activities - Discontinued Operations
Other Commitments [Table]
Net Cash provided by/(used in) Operating Activities - Discontinued Operations
Net Cash provided by/(used in) Investing Activities - Discontinued Operations
Discontinued operations, basic and diluted (in dollars per share)
us-gaap_PreferredStockConvertibleConversionPrice
Preferred Stock, Convertible, Conversion Price (in dollars per share)
Gain on disposal of asset
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal
Loss on disposal of asset
us-gaap_DebtCurrent
Debt, Current
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income / (Loss) before provision for income taxes
Loss on extinguishment of debt
(Gain)/loss on debt extinguishment
Additional paid in capital
Total Fair Value of Invested Capital
Joint Venture Formation, Fair Value of Joint Venture
Debt Disclosure [Text Block]
Debt Conversion, Name [Domain]
Noncontrolling interest
Debt Conversion Description [Axis]
Prepaid expenses and other current assets
Prepaid expenses and other current assets
us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Stock Issued During Period, Value, Restricted Stock Award, Gross
Shares issued related party
Stock Issued During Period, Value, New Issues
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
Stock compensation
UNITED STATES
us-gaap_DebtInstrumentCarryingAmount
Long-Term Debt, Gross
us-gaap_DebtInstrumentFairValue
Debt Instrument, Fair Value Disclosure
Conversion of Debt
Shares issued in conversion of debt
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Consideration for EverOn transaction
Stock Issued During Period, Value, Acquisitions
Current Assets
us-gaap_AssetsCurrent
Total Current Assets
Stock compensation (in shares)
Fair Value, Recurring and Nonrecurring [Table]
us-gaap_LitigationSettlementAmountAwardedToOtherParty
Litigation Settlement, Amount Awarded to Other Party
Shares issued, shares (in shares)
Stock Issued During Period, Shares, New Issues (in shares)
Conversion of Debt (in shares)
Debt Instrument, Name [Domain]
Consideration for EverOn transaction (in shares)
Stock Issued During Period, Shares, Acquisitions (in shares)
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt Instrument, Interest Rate, Stated Percentage
us-gaap_DebtInstrumentInterestRateDuringPeriod
Debt Instrument, Interest Rate During Period
us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)
Class of Stock [Domain]
Related and Nonrelated Parties [Axis]
us-gaap_DebtInstrumentUnamortizedDiscount
Debt discount
Share-based compensation to third parties
Schedule of Long-Term Debt Instruments [Table]
Conversion of Note into Restricted Common Stock [Member]
Conversion of Note into Restricted Common Stock
Debt Instrument [Axis]
us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net Cash provided by/(used in) Operating Activities
Cash Flows from Operating Activities
Fair value movement of warrant derivative liability
Fair value movement of warrant derivative liability
Cash Flows from Investing Activities:
Cash Flows from Financing Activities:
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
us-gaap_PaymentsOfDebtIssuanceCosts
Payments of Debt Issuance Costs
us-gaap_LitigationSettlementInterest
Litigation Settlement Interest
Settlement of Payables for Shares [Member]
Represents the settlement of payables for shares.
Conversion of Related Party Debt into Common Stock [Member]
Represents the conversion of related party debt into common stock.
Accounting Policies [Abstract]
Shares Issued Under 3a(10) Debt Settlement [Member]
Represents the shares issued under 3a(10) debt settlement.
November 2025 Note [Member]
Represents the November 2025 note.
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
September 2025 Note [Member]
Represents the September 2025 note.
alce_VotingSharesPercentage
Voting Shares, Percentage
The number of voting shares owned at a given time expressed as a percentage of total voting shares.
Note Purchase Agreement Purchased By Third Party [Member]
Represents the portion of the note purchase agreement that was purchased by a third party.
May 2025 Note [Member]
Represents the May 2025 note.
Secured Promissory Notes Sold in Subscription Agreements [Member]
Represents secured promissory notes sold in subscription agreements.
alce_BeneficialOwnershipMaximum
Beneficial Ownership, Maximum
The maximum required percentage of beneficial ownership of common stock following the conversion.
Continuing operations, basic and diluted (in dollars per share)
Loss from continuing operations
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent
Income / (Loss) from continuing operations
March 2026 Extended Notes [Member]
Represents the March 2026 extended notes.
alce_DebtInstrumentCovenantCapitalRaise
Debt Instrument, Covenant, Capital Raise
A debt instrument covenant pertaining to the amount of capital raised.
Conversion of Jones Trading Debt to Series C Preferred Stock [Member]
Represents the conversion of the Jones Trading debt to series c preferred stock.
Measurement Input Type [Axis]
Jones Trading Debt [Member]
Represents Jones Trading Institutional Services debt.
Income Statement [Abstract]
Series C Convertible Preferred Stock [Member]
Represents Series C Convertible Preferred Stock.
Conversion of SCM Tech Debt Into Series C Preferred Stock [Member]
Represents the conversion of the SCM Tech Debt into Series C Preferred Stock.
alce_PutOptionAgreementCovenantPriceOfRepurchasedShares
Put Option Agreement, Covenant, Price of Repurchased Shares (in dollars per share)
The price of repurchased shares as part of the put option agreement.
Income/(Loss) before provision for income taxes
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax
Income/(loss) from discontinued operations
Series E Convertible Preferred Stock [Member]
Represents the Series E Convertible Preferred Stock.
Gain on sale of subsidiaries
Gain on sale of subsidiaries
Gain/(loss) from operations of discontinued business component
alce_PutOptionAgreementCovenantEquityRaise
Put Option Agreement, Covenant, Equity Raise
A covenant for the put option agreement detailing the equity raise requirement.
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Series D Convertible Preferred Stock [Member]
Represents Series D Convertible Preferred Stock.
Net income/(loss) per share attributable to common stockholders, basic and diluted (in dollars per share)
alce_PutOptionAgreementCovenantSharesRepurchased
Put Option Agreement, Covenant, Shares Repurchased (in shares)
The number of shares that may be repurchased as part of the put option agreement.
alce_PutOptionAgreementCovenantPeriodOfTime
Put Option Agreement, Covenant, Period of Time (Year)
The period of time over which the put option agreement is in place.
Discontinued operations:
Measurement Input, Expected Dividend Rate [Member]
Third Investor Promissory Note [Member]
Third Investor Promissory Note
Measurement Input, Expected Term [Member]
September 2025 Notes [Member]
September 2025 Notes
alce_DevelopmentCostsSubsumed
Development Costs Subsumed
The amount of development costs subsumed as part of the joint venture formation.
Income Tax Contingency [Table]
Conversion of Notes into Series C Convertible Preferred Stock [Member]
Represents the conversion of notes into Series C Convertible Preferred Stock.
us-gaap_FairValueAdjustmentOfWarrants
Fair value movement in warrant liability
Nicholas Parker [Member]
Represents Nicholas Parker.
alce_DebtInstrumentMinimumEquityFinancingCovenant
Debt Instrument, Minimum Equity Financing Covenant
The minimum equity financing that must be closed as a covenant of the debt instrument.
alce_OwnershipPercentage
Ownership Percentage
Percentage of ownership.
Net Loss
Net income/(loss)
Measurement Input, Price Volatility [Member]
alce_ClassOfWarrantOrRightIssued
Class of Warrant or Right, Issued (in shares)
The number of warrants or rights issued.
Favorable Contracts [Member]
Represents favorable contracts.
us-gaap_AmortizationOfFinancingCosts
Amortization of Debt Issuance Costs
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets
Subscription Agreements [Member]
Subscription Agreements
us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Merger Costs – Settlement of Related Party Debt and Conversion of Debt
Operating Expenses
Measurement Input, Share Price [Member]
Measurement Input Type [Domain]
Measurement Input, Risk Free Interest Rate [Member]
Convertible Debt Securities [Member]
us-gaap_DebtConversionOriginalDebtAmount1
Debt Conversion, Original Debt, Amount
Shares issued for conversion and settlement of debt
Debt Conversion, Converted Instrument, Amount
Convertible Debt [Table Text Block]
us-gaap_DebtInstrumentMeasurementInput
Risk-free rate
us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Debt Conversion, Converted Instrument, Shares Issued (in shares)
us-gaap_CostsAndExpenses
Total operating income/ (expenses)
Income Tax Disclosure [Text Block]
Risk-free rate
us-gaap_WarrantsAndRightsOutstandingMeasurementInput
us-gaap_StockholdersEquityPeriodIncreaseDecrease
Stockholders' Equity, Period Increase (Decrease)
alce_DisposalGroupIncludingDiscontinuedOperationOtherExpensesTotal
Total other expenses
Represents the amount of total other expenses reported from a disposal group, including discontinued operation during the period.
Accounting Standards Update and Change in Accounting Principle [Table]
Other expense
Non-cash investing and financing activities:
us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense
Selling, general, and administrative
Remuneration in respect of services as directors
Related and Nonrelated Parties [Domain]
us-gaap_DeferredFinanceCostsNet
Debt Issuance Costs, Net
Related Party Transaction [Table]
Related Party Transactions Disclosure [Text Block]
Total
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Alternus Energy Group Plc [Member]
Represents Alternus Energy Group Plc.
Sale of Subsidiaries [Text Block]
Represents the entire disclosure of the sale of subsidiaries during the period.
us-gaap_RepaymentsOfAssumedDebt
Repayments of Assumed Debt
Short secured debt
Represents the amount of short term secured debt included in the liabilities of a disposal group.
Disposal Group, Not Including Discontinued Operation, Assets and Liabilities of Subsidiary Sold [Table Text Block]
Represents the tabular disclosure of the assets and liabilities of a subsidiary sold that is reported as a disposal group that is not a discontinued operation during the period.
Fair Value Hierarchy and NAV [Domain]
Operating leases, current liabilities
Represents the current portion of operating lease liabilities included in the liabilities of a disposal group.
Measurement Frequency [Domain]
Accounts payable & accrued liabilities
alce_DisposalGroupNotDiscontinuedOperationCostsAssociatedWithSale
Disposal Group, Not Discontinued Operation, Costs Associated with Sale
Represents the amount of costs associated with the sale of a disposal group that is not considered a discontinued operation during the period.
us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent
Accounts payable
Total assets sold
Fair value movement of convertible notes
Fair value movement of convertible notes
The fair value adjustments for convertible debt and associated warrants.
Other income/(expense):
Statement of Financial Position [Abstract]
Convertible notes measured at fair value
us-gaap_ConvertibleDebtFairValueDisclosures
us-gaap_NonoperatingIncomeExpense
Total other expenses
Operating leases, non-current liabilities
Represents the non current portion of operating lease liabilities reported under the liabilities of a disposal group.
Asset Sold under Agreement to Repurchase [Table]
Schedule of Variable Interest Entities [Table Text Block]
Net (gain)/loss on sale of net assets
Represents the amount of gain (loss) on the sale of the net assets of a disposal group.
us-gaap_OtherNoncashExpense
Other Noncash Expense
Gain on settlement of payables
Gain on settlement of payables
The amount of gain or loss on the settlement of payables.
Conversion of SNC Outstanding Debt into Series D Preferred Stock [Member]
Represents the conversion of the outstanding SNC debt into series D preferred stock.
Conversion of Two Promissory Notes into Series E Convertible Preferred Stock [Member]
The conversion of two promissory notes into series E convertible preferred stock.
Assets in Netherlands [Member]
Represents assets in Netherlands.
Assets in Poland [Member]
Represents assets in Poland.
Supplemental Cash Flow Disclosure
Sale of Assets Held for Sale [Text Block]
Represents the entire disclosure of the sale of assets held for sale during the period.
us-gaap_RepaymentsOfRelatedPartyDebt
Repayments of shareholder loans
Other Assets
Other Assets
Variable Interest Entity [Table]
alce_PolicyTable
Net (gain)/loss on sale of the subsidiaries
Represents the amount of gain (loss) on the sale of subsidiaries.
Aeg Mh 02 Limited [Member]
Represents the AEG MH 02 limited sale.
Fair Value, Recurring [Member]
us-gaap_CommonStockConvertibleConversionPriceIncrease
Common Stock, Convertible, Conversion Price, Increase (in dollars per share)
us-gaap_OtherAssetsNoncurrent
Total
Nonmonetary Transaction Type [Domain]
Nonmonetary Transaction Type [Axis]
CEO And Executive Director [Member]
Represents the CEO and executive director.
Four Current Independent Directors [Member]
Represents four current independent directors.
Warrant [Member]
us-gaap_ConvertibleDebt
Convertible Debt
us-gaap_WarrantsAndRightsOutstanding
Warrants and Rights Outstanding
Document Type
Document Information [Line Items]
Document Quarterly Report
alce_MaximumConversionPrice
Maximum Conversion Price (in dollars per share)
Represents the maximum conversion price.
us-gaap_RestructuringCosts
Restructuring Costs
Loss on settlement of liabilities
Loss on settlement of liabilities
alce_MaximumBenchmarkAmountForRepaymentOfDebt
Maximum Benchmark Amount for Repayment of Debt
Represents the maximum benchmark amount used for the repayment of debt.
alce_InitialPaymentOnProject
Initial Payment On Project
Represents the amount of initial payment paid on a project during the period.
Document Information [Table]
alce_CashPlacementAgencyFeeAmount
Cash Placement Agency Fee Amount
Represents the amount of cash placement agency fee amount paid during the period.
Pro forma revenues
Antidilutive securities (in shares)
Antidilutive Securities [Axis]
Entity Interactive Data Current
Conversion of Note Into Shares [Member]
Represents the conversion of a note into shares.
Document Transition Report
alce_BeneficiallyOwnershipPercentage
Beneficially Ownership Percentage
Represents the beneficially ownership percentage.
us-gaap_DepreciationAndAmortizationDiscontinuedOperations
Depreciation, amortization, and accretion
Weighted-average common stock outstanding, diluted (in shares)
alce_ConvertibleDebtFairValueAdjustment
Convertible Debt, Fair Value Adjustment
Fair value movement of convertible debt
Represents the amount of adjustment to convertible debt during the period.
Basic & diluted earnings/(loss) per share of common stock:
alce_PercentageOfFaceValueOfNote
Percentage of Face Value of Note
Represents the percentage of the face value of a note.
Conversion of Note Into Common Stock [Member]
Represents the conversion of a note into common stock.
The Warrant [Member]
Represents the warrant.
*Pro forma net income (loss)
Weighted-average common stock outstanding, basic & diluted (in shares)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
us-gaap_EarningsPerShareBasic
Total loss per share of common stock, basic and diluted (in dollars per share)
Shares issued
Short term convertible and non-convertible promissory notes, net of debt issuance costs
Notes Payable, Current
Long term convertible and non-convertible promissory notes, net of debt issuance costs
Title and Position [Domain]
Capitalized costs
Represents the amount of capitalized development costs.
Fair value movement of FPA asset
Fair value movement of FPA Asset
Represents the amount of fair value adjustment to FPA assets during the period.
Project [Domain]
alce_ProceedsFromIssuanceOfDebtExpected
Proceeds from Issuance of Debt Expected
Represents the amount of proceeds from the issuance of debt expected during the period.
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Earnings Per Share, Policy [Policy Text Block]
Investor Promissory Notes, Second Tranche [Member]
Represents the investor promissory notes second tranche.
Investor Promissory Notes, First Tranche [Member]
Represents the investor promissory notes first tranche.
Intangible assets
alce_PaymentsOfConstructionInProcess
Construction in Process
Represents the payments of construction in process during the period.
Amortization of debt discount
alce_PaymentsOfCostsCapitalized
Capitalized Cost
Represents the amount of payments of costs capitalized during the period.
Finite lived intangible assets
us-gaap_FiniteLivedIntangibleAssetsNet
Finite-Lived Intangible Assets, Net
Depreciation, amortization and accretion
Depreciation, amortization, and accretion
Depreciation, amortization, and accretion
Document Fiscal Period Focus
Corporate Joint Venture [Member]
Private Placement Warrants [Member]
Represents private placement warrants.
Document Fiscal Year Focus
Investment, Name [Domain]
us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Stockholders' Equity Note, Stock Split, Conversion Ratio
Amendment Flag
Employee [Member]
Represents an employee.
Clo [Member]
Represents the CLO.
Common Stock [Member]
alce_GainLossOnRecission
Gain (Loss) on Recission
Represents the gain (loss) on recission during the period.
LiiON [Member]
Represents LiiON.
Microgrid Projects With Hover Energy in the US [Member]
Represents microgrid projects with Hover Energy in the US.
Goodwill
Goodwill
Goodwill
Capitalized development cost
Capitalized Development Cost
Represents the amount of capitalized development cost.
Document Period End Date
Warrant Liability [Member]
Represents a warrant liability.
Four Third Party Debt Holders [Member]
Represents four third party debt holders.
Reclass of accrued interest to convertible note
Represents the amount of liability reclassified on a recurring basis with fair value measurements with unobservable inputs.
Legal Entity [Axis]
Alt Spain Hold Shares [Member]
Represents Alt Spain Hold Shares.
us-gaap_FinancialLiabilitiesFairValueDisclosure
Total
Accrued audit fees
Represents current accrued audit fees.
Italian Projects [Member]
Represents Italian projects.
Assure Power, LLC [Member]
Represents Assure Power, LLC.
Accrued tax penalties
Represents current accrued tax penalties.
Business Combination [Domain]
Amounts due to AEG not acquired
Represents amounts due and not acquired attributable to a disposal group held for sale or disposed of.
Entity File Number
Short term convertible & non-convertible notes
Represents the amount classified as short term convertible and nonconvertible notes attributable to a disposal group held for sale or disposed of.
Entity Tax Identification Number
Conversion of Note into Unrestricted Common Stock [Member]
Represents the conversion of a note into unrestricted common stock.
Business Combination [Axis]
Reverse Stock Split [Member]
Represents a reverse stock split.
Entity [Domain]
Entity Central Index Key
Ownership percentage, business acquisition
Capitalized development costs
alce_DisposalGroupIncludingDiscontinuedOperationCapitalizedDevelopmentCosts
Represents the amount classified as capitalized development costs attributable to disposal group held for sale or disposed of.
Entity Registrant Name
alce_SaleOfAssetsMinimumPrice
Sale of Assets, Minimum Price
Represents the minimum price in the sale of assets.
Software, Internally Developed [Member]
alce_PreferredStockSharesDesignatedIncrease
Preferred Stock, Shares Designated, Increase (in shares)
Represents the increase in preferred stock shares designated.
alce_PreferredStockSharesDesignated
Preferred Stock, Shares Designated (in shares)
Represents the number of preferred stock shares designated.
Entity Current Reporting Status
Conversion of Assigned Note into Common Stock [Member]
Represents the conversion of a assigned note into common stock.
Business Combination [Table]
alce_ConsultingMonthlyFee
Consulting Monthly Fee
Represents the amount of a consulting monthly fee.
Entity Incorporation, State or Country Code
The 3i [Member]
Represents the 3i.
alce_SharebasedCompensationArrangementBySharebasedPaymentAwardVotingRightsPercentage
Share-Based Compensation Arrangement by Share-Based Payment Award, Voting Rights, Percentage
Represents the percentage of voting rights under a share-based payment arrangement.
alce_PreferredStockVotesPerShare
Preferred Stock, Votes Per Share
Represents the number of votes per share of preferred stock.
Twenty Twenty Three Equity Incentive Plan [Member]
Represents the 2023 equity incentive plan.
Business Combination, Pro Forma Information [Table Text Block]
Current Fiscal Year End Date
Conversion of Promissory Note into Common Stock [Member]
Represents the conversion of a promissory note into common stock.
alce_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantPercentageOfSharesOutstanding
Share Based Compensation Arrangement By Share Based Payment Award, Number of Shares Available for Grant, Percentage of Shares Outstanding
Represents the percentage of shares outstanding under a share based compensation arrangement.
Entity Ex Transition Period
Entity Filer Category
alce_OwnershipSoldPercentage
Ownership Sold Percentage (in dollars per share)
Represents the percentage of ownership sold.
Entity Shell Company
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Business Combination, Recognized Liability Assumed, Liability
Entity Emerging Growth Company
Entity Small Business
Hover [Member]
Represents Hover.
us-gaap_OperatingIncomeLoss
Income/(loss) from operations
Issued, weighted average exercise price (in dollars per share)
Represents the weighted average exercise price per share of warrants or rights issued during period.
us-gaap_Cash
Cash
Other current liabilities
us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities
Other current liabilities
alce_ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average exercise price (in dollars per share)
Represents the weighted average exercise price for outstanding warrants or rights.
us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
Other current assets
us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents
Cash and cash equivalents
Issued during the period, warrants (in shares)
Class of Warrant or Right, Issued During Period (in shares)
Represents the number of warrants or rights issued during period.
us-gaap_InterestExpenseDebt
Interest Expense, Debt
Exercisable, warrants (in shares)
Represents the number of warrants or rights exercisable during the period.
Total Consideration
Entity Address, State or Province
Issued, weighted average remaining contractual term (Year)
Represents the weighted average remaining contractual term of warrants or rights issued during the period.
Entity Address, City or Town
Derivative liability - warrants
alce_ClassOfWarrantOrRightOutstandingWeightedAverageRemainingContractualTerm
Outstanding, weighted average remaining contractual term (Year)
Outstanding, weighted average remaining contractual term (Year)
Represents the weighted average remaining contractual term of warrants or rights outstanding.
us-gaap_InterestExpenseNonoperating
Interest expense
Accumulated deficit
Entity Address, Address Line One
Exercisable, weighted average exercise price (in dollars per share)
Represents the weighted average exercise price of warrants or rights exercisable.
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
City Area Code
Local Phone Number
Entity Address, Postal Zip Code
Warrants [Member]
Represents Warrants
Exercisable, weighted average remaining contractual term (Year)
Represents the weighted average remaining contractual term of warrants or rights exercisable.
OASIS Software contributed to JV at fair value
Preferred Stock [Member]
Title of 12(b) Security
Trading Symbol
Conversion of Debt Into Preferred Stock [Member]
Represents the conversion of debt into preferred stock.
Capitalized Contract Cost [Table]
us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Instrument, Convertible, Conversion Price (in dollars per share)
Class of Stock [Axis]
Related Party Transaction [Domain]
Entity Common Stock, Shares Outstanding
Related Party Transaction [Axis]
Chief Executive Officer [Member]
Director [Member]
Officer [Member]
us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net Income (Loss) Attributable to Noncontrolling Interest
us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Proceeds from Debt, Net of Issuance Costs
alce_PreferredStockStatedValue
Preferred Stock, Stated Value (in dollars per share)
Represents the stated value of preferred stock.
Scenario [Axis]
EBITDA
Represents earnings before interest, taxes, depreciation and amortization (EBITDA).
Equity, Capital Unit or Share [Table]
Scenario [Domain]
Forecast [Member]
Long-Lived Asset, Held-for-Sale [Table]
alce_ShareholderOwnershipPercentage
Shareholder Ownership, Percentage
Represents the percentage of shareholder ownership.
Clean Earth Acquisitions Sponsor [Member]
Represents Clean Earth Acquisitions Sponsor.
Nordic Esg [Member]
Represents Nordic ESG.
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share (in dollars per share)
Investment, Name [Axis]
Debt restructuring costs
Debt restructuring costs
The amount of debt restructuring costs.
New convertible notes issued at fair value
Series B Convertible Preferred Stock issued to Hover
Other Liabilities
Other Liabilities
Basis of Accounting, Policy [Policy Text Block]
Capitalized development costs subsumed
Schedule of Other Assets, Noncurrent [Table Text Block]
Hoover [Member]
Related to Hoover.
Noncash reduction of debt and non-current lease liability from sale of Spanish subsidiary
The amount of noncash sale of assets.
us-gaap_OtherNonoperatingIncome
Other income
us-gaap_OtherNonoperatingExpense
Other expense
Loss on settlement of SAA with Hover
Loss on settlement of SAA
The amount of gain (loss) from settlement.
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Conversions in period
Conversions in period
Impairment of amounts due from related party
The amount of impairment of amounts due from related party.
alce_AmountToBeRepaidInCash
Amount to be Repaid in Cash
The amount to be repaid in cash.
alce_ValueOfRestitution
Value of Restitution
The value of restitution.
Sale of Stock [Domain]
Convertible Note Warrants [Member]
Related to convertible note warrants.
alce_LossOnSettlementOfLiability
Loss on Settlement of Liability
The amount of loss from settlement of liability.
Total for Europe – Continuing Operations
Total Assets
Total for United States – Continuing Operations
alce_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExtinguishments
Loss from extinguishment on July 1, 2025
Loss from extinguishment on July 1, 2025
Amount of extinguishments of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
April 2025 Warrants [Member]
Related to April 2025 warrants.
Spanish Assets [Member]
Related to Spanish assets.
OID Notes [Member]
Related to OID Notes.
us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents
Professional Consulting Agreement [Member]
Represents a professional consulting agreement.
Geographical [Domain]
Consulting Agreement [Member]
Represents a consulting agreement.
Geographical [Axis]
alce_IncreaseInProfessionalFeesPerMonth
Increase in Professional Fees Per Month
Represents the amount of increase in professional fees per month during the period.
Multiple Promissory Notes [Member]
Related to multiple promissory notes.
Total Notes [Member]
Related to total notes.
alce_AssetsContributedForAquisition
Assets Contributed for Aquisition
The value of assets contributed for acquisition.
alce_CostsPreviouslyCapitalizedSubsumedForAcquisition
Costs Previously Capitalized Subsumed for Acquisition
The value of costs previously capitalized subsumed for acquisition.
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
April and October Convertible Notes [Member]
Represents the April and October convertible notes.
Net income/(loss) from discontinued operations
Income/(loss) from discontinued operations, net of tax
Represents Remuneration in Respect to Long-Term Incentive Schemes with Restricted Shares [Member]
Represents remuneration in respect to long-term incentive schemes with restricted shares.
Remuneration in Respect of Services of Directors [Member]
Represents remuneration in respect of services of directors.
alce_DebtInstrumentOriginalIssueDiscountPercentage
Debt Instrument, Original Issue Discount Percentage
Represents the original issue discount percentage of a debt instrument.
Notes reclassified upon reevaluation of embedded features
Represents the amount of reclassification adjustment of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
us-gaap_InvestmentOwnedBalanceShares
Investment Owned, Balance, Shares (in shares)
Reclass of accrued interest to convertible note
alce_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationOfInterest
Amount of interest reclassified to financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Term Loans [Member]
Relating to term loans.
alce_GainLossOnDebtSettlements
(Gain) / loss on debt settlement
Represents the amount of gain (loss) on debt settlements during the period.
The 2024 Convertible Notes [Member]
Relating to the 2024 Convertible Notes.
us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold
Cost of revenues
us-gaap_FinitelivedIntangibleAssetsAcquired1
Finite lived intangible assets
Consolidation, Policy [Policy Text Block]
Fair Value by Liability Class [Domain]
us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
Disposal Group, Including Discontinued Operation, Interest Expense
Interest expense
Disposal Group Name [Domain]
Gain/(loss) on sale of discontinued operations, net assets
Interest
Foreign currency translation reserve
us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses
Schedule of Long-Term Debt Instruments [Table Text Block]
Revenues
Liability for Catastrophe Claims [Table]
Business Combination [Table Text Block]
Total operating expenses
Total operating expenses
us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Equity, Including Portion Attributable to Noncontrolling Interest
Total Shareholders’ Equity (Deficit)
Balance
Balance
Disposal Groups, Including Discontinued Operations [Table]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)
Disposal Groups, Including Discontinued Operations [Table Text Block]
Disposal Group Name [Axis]
Other payables
Other Payables
Represents the amount of other current payables.
Alt Alliance Llc [Member]
Represents Alt Alliance LLC.
alce_TaxesRecoverable
Taxes recoverable
Represents the amount of taxes recoverable.
us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Disposal Group, Including Discontinued Operation, Consideration
Parent [Member]
EverOn Energy LLC [Member]
Represents EverOn Energy LLC.
Noncontrolling Interest [Member]
us-gaap_StockholdersEquity
Equity, Attributable to Parent
Shareholders’ Equity (Deficit) attributable to parent
us-gaap_ValueAddedTaxReceivableCurrent
Taxes recoverable
Loss on issuance of debt
Gain (Loss) On Issuance of Debt
Loss on issuance of debt
Represents the amount of gain (loss) on the issuance of debt during the period.
Microgrid Projects With Hover Energy [Member]
Represents microgrid projects with Hover Energy.
us-gaap_PaymentsForLegalSettlements
Payments for Legal Settlements
Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table]
Majority Buyer [Member]
Represents the majority buyer.
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
alce_SharePurchaseAgreementPercentageOfOwnershipAfterAgreement
Share Purchase Agreement, Percentage of Ownership After Agreement
Represents the percentage of ownership after a share purchase agreement.
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Revenue
Revenues