| Schedule of Carrying Amounts and Estimated Fair Values of Long-Term Debt |
Details surrounding the fair value and individual carrying values of instruments are provided in the table that follows. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, | | December 31, | | | | 2026 | | 2025 | | (Thousands of dollars) | | Carrying
Amount | | Fair
Value | | Carrying
Amount | | Fair
Value | | Southwest Gas Holdings, Inc. and Southwest Gas Corporation: | | | | | | | | | | Debentures: | | | | | | | | | 8% Series, due August 2026 | | $ | 75,000 | | | $ | 75,121 | | | $ | 75,000 | | | $ | 76,388 | | Medium-term notes, 7.92% series, due June 2027 | | 25,000 | | | 25,603 | | | 25,000 | | | 26,058 | | Medium-term notes, 6.76% series, due September 2027 | | 7,500 | | | 7,625 | | | 7,500 | | | 7,726 | | Notes, 5.8%, due December 2027 | | 300,000 | | | 304,470 | | | 300,000 | | | 309,090 | | Notes, 3.7%, due April 2028 | | 300,000 | | | 295,530 | | | 300,000 | | | 297,450 | | Notes, 5.45%, due February 2028 | | 300,000 | | | 303,960 | | | 300,000 | | | 307,620 | | Notes, 2.2%, due June 2030 | | 450,000 | | | 408,555 | | | 450,000 | | | 409,365 | | Notes, 4.05%, due March 2032 | | 600,000 | | | 573,660 | | | 600,000 | | | 579,540 | | Notes, 6.1%, due February 2041 | | 125,000 | | | 130,538 | | | 125,000 | | | 130,762 | | Notes, 4.875%, due October 2043 | | 250,000 | | | 219,000 | | | 250,000 | | | 219,350 | | Notes, 3.8%, due September 2046 | | 300,000 | | | 229,710 | | | 300,000 | | | 228,180 | | Notes, 4.15%, due June 2049 | | 300,000 | | | 237,330 | | | 300,000 | | | 237,120 | | Notes, 3.18%, due August 2051 | | 300,000 | | | 200,400 | | | 300,000 | | | 205,710 | | | Unamortized discount and debt issuance costs | | (21,515) | | | | | (23,207) | | | | | | 3,310,985 | | | | | 3,309,293 | | | | | Revolving credit facility and commercial paper | | — | | | | | — | | | | | Industrial development revenue bonds: | | | | | | | | | Tax-exempt Series A, due December 2028 | | 50,000 | | | 50,000 | | | 50,000 | | | 50,000 | | 2003 Series A, due March 2038 | | 50,000 | | | 50,000 | | | 50,000 | | | 50,000 | | 2008 Series A, due March 2038 | | 50,000 | | | 50,000 | | | 50,000 | | | 50,000 | | 2009 Series A, due December 2039 | | 50,000 | | | 50,000 | | | 50,000 | | | 50,000 | | | Unamortized discount and debt issuance costs | | (1,126) | | | | | (1,281) | | | | | | 198,874 | | | | | 198,719 | | | | | Less: current maturities | | 100,000 | | | | | 75,000 | | | | | Southwest Gas Holdings, Inc. and Southwest Gas Corporation total long-term debt, less current maturities | | $ | 3,409,859 | | | | | $ | 3,433,012 | | | |
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