Company: EAI
Filing Date: 2025-08-06
Form Type: S-3ASR
Source: 0001193125-25-174487
Chunk: 128

Company: ENTERGY ARKANSAS, LLC
Filing Date: 2025-08-06
Form: S-3ASR
Chunk 128
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 liens) on substantially all of our property; and                                                                  |

| • |     | will not be listed on a national securities exchange unless otherwise indicated in the accompanying prospectus 
 supplement.                                                                                                    |

You -

| • |     | will receive interest and principal payments in the amounts and on the dates specified in an accompanying 
 prospectus supplement.                                                                                    |

This prospectus may be used to offer and sell series of first mortgage bonds only if accompanied by the prospectus supplements for those series. We will provide the specific information for those offerings and the specific terms of those first mortgage bonds, including their offering prices, interest rates and maturities, in supplements to this prospectus. The supplements may also add, update or change the information in this prospectus. You should read this prospectus and any supplements carefully before you invest. Investing in the first mortgage bonds offered by this prospectus involves risks. See “ Risk Factors” on page 1. 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. We may offer the first mortgage bonds directly or through underwriters, agents or dealers. Each prospectus supplement will provide the terms of the plan of distribution for the related series of first mortgage bonds. The date of this prospectus is August 6, 2025.

TABLE OF CONTENTS

|                                     |     | Page |    |
| RISK FACTORS                        |     |      |  1 |
| ABOUT THIS PROSPECTUS               |     |      |  1 |
| ENTERGY MISSISSIPPI, LLC            |     |      |  1 |
| WHERE YOU CAN FIND MORE INFORMATION |     |      |  2 |
| USE OF PROCEEDS                     |     |      |  2 |
| DESCRIPTION OF THE NEW BONDS        |     |      |  3 |
| PLAN OF DISTRIBUTION                |     |      | 14 |
| EXPERTS                             |     |      | 15 |
| LEGALITY                            |     |      | 15 |

RISK FACTORS

Investing in the first mortgage bonds involves certain risks. In considering whether to purchase the first mortgage bonds being offered by this prospectus
(the “New Bonds”), you should carefully consider the information we have included or incorporated by reference in this prospectus. In particular, you should carefully consider the information under the headings “Risk Factors
Summary