Company: ALCE
Filing Date: 2025-03-31
Form Type: NT 10-K
Source: 0001213900-25-026376
Chunk: 0

Company: Alternus Clean Energy, Inc.
Filing Date: 2025-03-31
Form: NT 10-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 12b-25

NOTIFICATION OF LATE FILING

(Check one): ☒Form 10-K ☐Form 20-F ☐Form
11-K ☐Form 10-Q ☐Form N-SAR ☐Form N-CSR</div>

For Period Ended: 12/31/2024

☐Transition Report on Form 10-K

☐Transition Report on Form 20-F

☐Transition Report on Form 11-K

☐Transition Report on Form 10-Q

☐Transition Report on Form N-SAR

For the Transition Period Ended: ________________________________

| Read Instruction (on back page) Before Preparing                   
 Form. Please Print or Type.                                        
 Nothing in this form shall be construed to imply                   
 that the Commission has verified any information contained herein. |

If the notification relates to a portion of the filing
checked above, identify the item(s) to which the notification relates:

PART I -- REGISTRANT INFORMATION

| ALTERNUS CLEAN ENERGY, INC.                               |
| Full Name of Registrant                                   |
| CLEAN EARTH ACQUISITION CORP.                             |
| Former Name if Applicable                                 |
| 17 State Street, Suite 4000                               |
| Address of Principal Executive Office (Street and Number) |
| New York, NY 10004                                        |
| City, State and Zip Code                                  |

<div align='center'>PART II -- RULES 12b-25(b) AND (c)</div>

If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate)

| ☒ | -a | The reasons described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense;                                                                                                                                                                                                                                                                                         |
| ☒ | -b | The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, Form 11-K, Form N-SAR or Form N-CSR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and |
|