# EDGAR Filing Document

**Accession Number:** 0000092521
**File Stem:** 0001193125-26-281276
**Filing Date:** 2026-6
**Character Count:** 5905
**Document Hash:** 424b7eaf6b9dbfd2cf889439d39bf07f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-281276.hdr.sgml**: 20260624

**ACCESSION NUMBER**: 0001193125-26-281276

**CONFORMED SUBMISSION TYPE**: FWP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260624

**DATE AS OF CHANGE**: 20260624

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SOUTHWESTERN PUBLIC SERVICE CO
- **CENTRAL INDEX KEY:** 0000092521
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 750575400
- **STATE OF INCORPORATION:** NM
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-278797-01
- **FILM NUMBER:** 261116850

**BUSINESS ADDRESS:**
- **STREET 1:** SPS TOWER
- **STREET 2:** TYLER AT SIXTH ST
- **CITY:** AMARILLO
- **STATE:** TX
- **ZIP:** 79101
- **BUSINESS PHONE:** 3035717511

**MAIL ADDRESS:**
- **STREET 1:** PO BOX 1261
- **CITY:** AMARILLO
- **STATE:** TX
- **ZIP:** 79170
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SOUTHWESTERN PUBLIC SERVICE CO
- **CENTRAL INDEX KEY:** 0000092521
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 750575400
- **STATE OF INCORPORATION:** NM
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP

**BUSINESS ADDRESS:**
- **STREET 1:** SPS TOWER
- **STREET 2:** TYLER AT SIXTH ST
- **CITY:** AMARILLO
- **STATE:** TX
- **ZIP:** 79101
- **BUSINESS PHONE:** 3035717511

**MAIL ADDRESS:**
- **STREET 1:** PO BOX 1261
- **CITY:** AMARILLO
- **STATE:** TX
- **ZIP:** 79170

Free Writing Prospectus

Filed Pursuant to Rule 433

Registration Statement No. 333-278797-01

**Southwestern Public Service Company** 

**(a New Mexico corporation)** 

**$650,000,000 5.300% FIRST MORTGAGE BONDS, SERIES NO. 13 DUE 2036** 

**$550,000,000 5.875% FIRST MORTGAGE BONDS, SERIES NO. 14 DUE 2056** 

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| | | |
|:---|:---|:---|
| Issuer: | Southwestern Public Service Company (a New Mexico corporation) | Southwestern Public Service Company (a New Mexico corporation) |
| Issue Format: | SEC Registered | SEC Registered |
| Expected Ratings\*: | A3/A-/A- (Stable/Stable/Stable) (Moody's/S&P/Fitch) | A3/A-/A- (Stable/Stable/Stable) (Moody's/S&P/Fitch) |
| Security Type: | First Mortgage Bonds | First Mortgage Bonds |
| Pricing Date: | June 24, 2026 | June 24, 2026 |
| Settlement Date: | June 29, 2026 (T+3) | June 29, 2026 (T+3) |
| Principal Amount: | $650000000 | $550000000 |
| Maturity Date: | August 15, 2036 | August 15, 2056 |
| Interest Payment Dates: | Semi-annually on February 15 and August 15, commencing on February 15, 2027 (long first coupon) | Semi-annually on February 15 and August 15, commencing on February 15, 2027 (long first coupon) |
| Reference Benchmark Treasury: | 4.375% due May 15, 2036 | 4.750% due February 15, 2056 |
| Benchmark Treasury Price: | 99-24+ | 98-09+ |
| Benchmark Treasury Yield: | 4.404% | 4.859% |
| Spread to Benchmark Treasury: | +90 bps | +103 bps |
| Yield to Maturity: | 5.304% | 5.889% |
| Coupon: | 5.300% | 5.875% |
| Price to the Public: | 99.958% of the principal amount | 99.790% of the principal amount |
| Net Proceeds to Issuer: | $645,502,000 (after deducting the underwriting discount but before transaction expenses) | $544,032,500 (after deducting the underwriting discount but before transaction expenses) |
| Make-Whole Call: | Prior to February 15, 2036 (the 2036 par call date),<br> T +15 bps (calculated to the 2036 par call date) | Prior to February 15, 2056 (the 2056 par call date),<br> T +20 bps (calculated to the 2056 par call date) |
| Par Call: | On or after February 15, 2036, at par | On or after February 15, 2056 at par |
| Call for Tax Credit Event: | At the issuer's option, in whole, but not in part, at a redemption price equal to 101% of the principal amount plus accrued and unpaid interest to, but excluding, the redemption date (any notice of redemption may be sent only by the later of (a) December 31, 2026 and (b) six months from the date of issuance) | At the issuer's option, in whole, but not in part, at a redemption price equal to 101% of the principal amount plus accrued and unpaid interest to, but excluding, the redemption date (any notice of redemption may be sent only by the later of (a) December 31, 2026 and (b) six months from the date of issuance) |
| CUSIP/ISIN: | 845743 BZ5 / US845743BZ57 | 845743 CA9 / US845743CA97 |
| Minimum Denominations: | $2,000 and integral multiples of $1,000 in excess thereof | $2,000 and integral multiples of $1,000 in excess thereof |
| Joint Book-Running Managers: | BMO Capital Markets Corp.<br> BofA Securities, Inc.<br> Morgan Stanley & Co. LLC<br> RBC Capital Markets, LLC<br> Wells Fargo Securities, LLC |  |
| Co-Manager: | Independence Point Securities LLC |  |

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\* **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.

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**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, any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by calling BMO Capital Markets Corp. toll-free at (888) 200-0266, BofA Securities, Inc. toll-free at (800) 294-1322, Morgan Stanley & Co. LLC toll-free at (866) 718-1649, RBC Capital Markets, LLC toll free at (866) 375-6829 or Wells Fargo Securities, LLC toll-free at (800) 645-3751.**