Company: ALCE
Filing Date: 2025-08-15
Form Type: NT 10-Q
Source: 0001213900-25-077092
Chunk: 1

Company: Alternus Clean Energy, Inc.
Filing Date: 2025-08-15
Form: NT 10-Q
Chunk 1
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 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.

Alternus Clean Energy, Inc. (the “Company,” “we,” “us” or “our”) has determined that it is unable, without unreasonable effort or expense, to file its Quarterly Report on Form 10-Q for the period ended June 30, 2025 (the “Form 10-Q”) on or before the prescribed due date. The Company requires additional time to complete the final review of its financial statements and other disclosures in the Quarterly Report. The Company is, and has been, working diligently to complete its Form 10-Q as soon as possible and anticipates that the Form 10-Q will be filed within five calendar days following the prescribed due date in compliance with Rule 12b-25(b).

<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 ☒ No ☐

(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 ☐ No ☒

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

Alternus Clean Energy, Inc.

(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: | 08/15/2025 |     | By: | /s/ Vincent