Company: EAI
Filing Date: 2025-08-06
Form Type: S-3ASR
Source: 0001193125-25-174487
Chunk: 192

Company: ENTERGY ARKANSAS, LLC
Filing Date: 2025-08-06
Form: S-3ASR
Chunk 192
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 independent registered public accounting firm, as stated
in their reports. Such financial statements and financial statement schedule are incorporated by reference in reliance upon the reports of such firm, given their authority as experts in accounting and auditing.

LEGALITY

The
legality of the New Preferred Stock and certain legal matters with respect to the offering of the New Preferred Stock will be passed upon for us by Morgan, Lewis & Bockius LLP, New York, New York, as to matters of New York law, and by Husch
Blackwell LLP, Austin, Texas, as to matters of Texas law. Morgan, Lewis & Bockius LLP may rely on the opinion of Husch Blackwell LLP as to matters of Texas law relevant to its opinion. Husch Blackwell LLP may rely on Morgan,
Lewis & Bockius LLP as to matters of New York law relevant to its opinion. Certain legal matters with respect to the offering of the New Preferred Stock will be passed upon for the underwriters by Pillsbury Winthrop Shaw Pittman LLP, New
York, New York. Pillsbury Winthrop Shaw Pittman LLP from time to time represents certain of our affiliates in connection with various matters.

5

PROSPECTUS FIRST MORTGAGE BONDS SYSTEM ENERGY RESOURCES, INC. 1340 Echelon Parkway Jackson, Mississippi 39213 Telephone (601) 368-5000 We -

| • |     | may periodically offer our first mortgage bonds in one or more series; and |

| • |     | will determine the price and other terms of each series of first mortgage bonds when sold, including whether any 
 series will be subject to redemption prior to maturity.                                                          |

The First Mortgage Bonds -

| • |     | will be secured by a mortgage that constitutes a first mortgage lien (subject to certain exceptions and permitted 
 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