Document and Entity Information |
Aug. 21, 2023 |
|---|---|
| Cover [Abstract] | |
| Entity Registrant Name | SOUTHWESTERN PUBLIC SERVICE CO |
| Security 12b Title | Common Stock, $2.50 par value per share |
| Trading Symbol | XEL |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Entity Central Index Key | 0000092521 |
| Document Type | 8-K |
| Document Period End Date | Aug. 21, 2023 |
| Entity Incorporation State Country Code | NM |
| Entity File Number | 001-03789 |
| Entity Tax Identification Number | 75-0575400 |
| Entity Address, Address Line One | 790 South Buchanan |
| Entity Address, City or Town | Amarillo |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 79101 |
| City Area Code | (303) |
| Local Phone Number | 571-7511 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |