Company: SUNE
Filing Date: 2025-08-18
Form Type: 424B5
Source: 0001213900-25-078001
Chunk: 1

Company: SUNation Energy, Inc.
Filing Date: 2025-08-18
Form: 424B5
Chunk 1
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 Capital Market (“Nasdaq”) under the symbol “SUNE”. On August 15, 2025, the last reported sales price of
our Common Stock on Nasdaq was $1.66 per share.

Investment in our Common Stock involves risks. See the section entitled “Risk Factors” on page S-3 of this prospectus supplement and the risk factors contained in the documents incorporated by reference in this prospectus supplement and the accompanying prospectus for a discussion of certain factors which should be considered before investing in our Common Stock.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

<div align='center'>Needham & Company

The date of this prospectus supplement is August
18, 2025.

TABLE OF CONTENTS

PROSPECTUS SUPPLEMENT</div>

| ABOUT THIS PROSPECTUS SUPPLEMENT                  |     | S-ii  |
| CAUTIONARY NOTE ON FORWARD-LOOKING STATEMENTS     |     | S-iii |
| PROSPECTUS SUPPLEMENT SUMMARY                     |     | S-1   |
| THE OFFERING                                      |     | S-2   |
| RISK FACTORS                                      |     | S-3   |
| USE OF PROCEEDS                                   |     | S-7   |
| DILUTION                                          |     | S-8   |
| DIVIDEND POLICY                                   |     | S-9   |
| PLAN OF DISTRIBUTION                              |     | S-10  |
| LEGAL MATTERS                                     |     | S-11  |
| EXPERTS                                           |     | S-11  |
| WHERE YOU CAN FIND MORE INFORMATION               |     | S-12  |
| INCORPORATION OF CERTAIN INFORMATION BY REFERENCE |     | S-13  |

<div align='center'>PROSPECTUS</div>

| ABOUT THIS PROSPECTUS                                     |     | ii |
| PROSPECTUS SUMMARY                                        |     |  1 |
| SELECTED FINANCIAL DATA                                   |     |  2 |
| RISK FACTORS                                              |     |  4 |
| WHERE YOU CAN FIND MORE INFORMATION                       |     |  8 |
| INCORPORATION OF CERTAIN INFORMATION BY REFERENCE         |     |  9 |
| CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS |     | 10