Company: ALCE
Filing Date: 2025-03-31
Form Type: NT 10-K
Source: 0001213900-25-026376
Chunk: 1

Company: Alternus Clean Energy, Inc.
Filing Date: 2025-03-31
Form: NT 10-K
Chunk 1
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   | -c | The accountant's statement or other exhibit required by Rule 12b-25(c) has been attached if applicable.                                                                                                                                                                                                                                                                                                                     |

<div align='center'>PART III -- NARRATIVE</div>

State below in reasonable detail why Forms 10-K, 20-F,
11-K, 10-Q, N-SAR, N-CSR, or the transition report or portion thereof, could not be filed within the prescribed time period.

The Registrant is unable to file its Annual Report
on Form 10-K for the period ended December 31, 2024 (the “Report”) by the prescribed due date without unreasonable effort
or expense, because the Registrant needs additional time to complete certain disclosures and financials to be included in the Report.
In accordance with Rule 12b-25 promulgated under the Securities Exchange Act of 1934, as amended, the Registrant intends to file the
Report on or prior to the fifteenth (15th) calendar day following the prescribed due date.

<div align='center'>PART IV -- OTHER INFORMATION</div>

| (1) | Name and telephone number of person to contact in regard to this notification |

| Vincent Browne |     |        212 |     | 739-0727          |
| (Name)         |     | -Area Code |     | -Telephone Number |

| (2) | Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange                                                 
 Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant 
 was required to file such report(s) been filed? If answer is no, identify report(s). Yes x Noo                                                |

| (3) | Is it anticipated that any significant change in results of operations from the corresponding                                               
 period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? Yes o 
 No x                                                                                                                                        |

If so, attach an explanation of the anticipated change,
both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.

<div align='center'>2

(Name of Registrant as Specified in
Charter)</div>

has caused this notification to be signed on its behalf
by the undersigned hereunto duly authorized.

| Dated: 03/31/2025 |