Free Writing Prospectus (Form FWP)

Filed Pursuant to Rule 433

Registration No. 333-273697

February 27, 2026

PRICING TERM SHEET

(To Preliminary Prospectus Supplement dated February 25, 2026)

Issuer:			Mississippi Power Company (the "Company")
Security:			Series 2026A Floating Rate Senior Notes due May 15, 2076 (the "Series 2026A Senior Notes")
Expected Ratings:*			A3(Stable)/A-(Stable)/A(Stable) (Moody's/Standard & Poor's/Fitch)
Principal Amount:			$74,830,000
Initial Public Offering Price:			100%
Maturity Date:			May 15, 2076
Interest and Interest Payment Dates:			Floating rate based on Compounded SOFR (calculated as described in the Preliminary Prospectus Supplement), minus 0.35%, calculated quarterly, and payable on February 15, May 15, August 15 and November 15 of each year, beginning May 15, 2026
Optional Redemption:			On or after May 15, 2056, the Company may redeem the Series 2026A Senior Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at the following redemption prices (in each case expressed as a percentage of the principal amount), if redeemed during the twelve-month periods beginning on May 15 as set forth below:
			Twelve-Month Period Beginning on						Redemption Price
			May 15, 2056						105.00%
			May 15, 2057						104.50%
			May 15, 2058						104.00%
			May 15, 2059						103.50%
			May 15, 2060						103.00%
			May 15, 2061						102.50%
			May 15, 2062						102.00%
			May 15, 2063						101.50%
			May 15, 2064						101.00%
			May 15, 2065						100.50%
			May 15, 2066						100.00%
			and thereafter at 100% of the principal amount, in each case, together with any accrued and unpaid interest thereon to but excluding the redemption date

Repayment at Option of Holder:			The Series 2026A Senior Notes will be repayable at the option of a holder of the Series 2026A Senior Notes, in whole or in part, on the repayment dates and at the repayment prices (in each case expressed as a percentage of the principal amount) as set forth below:
			Repayment Date						Repayment Price
			May 15, 2027						98.00%
			November 15, 2027						98.00%
			May 15, 2028						98.00%
			November 15, 2028						98.00%
			May 15, 2029						98.00%
			November 15, 2029						98.00%
			May 15, 2030						98.00%
			November 15, 2030						98.00%
			May 15, 2031						98.00%
			November 15, 2031						99.00%
			May 15, 2032						99.00%
			November 15, 2032						99.00%
			May 15, 2033						99.00%
			November 15, 2033						99.00%
			May 15, 2034						99.00%
			November 15, 2034						99.00%
			May 15, 2035						99.00%
			November 15, 2035						99.00%
			May 15, 2036						99.00%
			November 15, 2036						99.00%
			May 15, 2037						100.00%
			and on May 15 of every second year thereafter, through and including May 15, 2073, at 100% of the principal amount, in each case, together with any accrued and unpaid interest thereon to but excluding the repayment date
Format:			SEC Registered
Denominations:			$1,000 and integral multiples of $1,000
CUSIP/ISIN:			605417 CE2/US605417CE21
Trade Date:			February 27, 2026
Expected Settlement Date:			March 3, 2026 (T+2)
Book-Running Manager:			RBC Capital Markets, LLC

*Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC website at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by calling the Company collect at 1-404-506-5579 or RBC Capital Markets, LLC toll free at 1-866-375-6829.