Long-Term Debt	12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]
Long-Term Debt	7. Long-Term Debt A substantial part of Tampa Electric’s tangible assets are pledged as collateral to secure its first mortgage bonds. There are currently no bonds outstanding under Tampa Electric’s first mortgage bond indenture, and Tampa Electric could cause the lien associated with this indenture to be released at any time. TEC 4.90% Notes due 2029 On January 30, 2024, TEC completed a sale of $500 million aggregate principal amount of 4.90% Notes due March 1, 2029 (the 2029 Notes). Prior to February 1, 2029, in the case of the 2029 Notes, TEC may redeem all or any part of such series of Notes at its option at a redemption price equal to the greater of (i) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date on a semi-annual basis at the Treasury Rate plus 15 basis points less interest accrued to the date of redemption or (ii) 100% of the principal amount of the notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date. On or after February 1, 2029, TEC may redeem the 2029 Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest thereon to the redemption date. TEC used the net proceeds from this offering for the repayment of a portion of the borrowings outstanding under the 5-year credit facility. Therefore, $497 million of borrowings outstanding under the 5-year credit facility were reclassified from notes payable to long-term debt on the Consolidated Balance Sheet as of December 31, 2023. TEC 3.875% Notes due 2024 and 5.00% Notes due 2052 On July 12, 2022, TEC completed a sale of (i) $300 million aggregate principal amount of 3.875% Notes due July 12, 2024 (the 2024 Notes) and (ii) $300 million aggregate principal amount of 5.00% Notes due July 15, 2052 (the 2052 Notes, and collectively, the Notes). Until July 12, 2024, in the case of the 2024 Notes, or January 15, 2052, in the case of the 2052 Notes, TEC may redeem all or any part of such series of Notes at its option at a redemption price equal to the greater of (i) 100% of the principal amount of such series of Notes to be redeemed or (ii) the sum of the present values of the remaining payments of principal and interest on the Notes to be redeemed that would be due if the Notes matured on (a) July 12, 2024, in the case of the 2024 Notes, discounted to the redemption date on a semiannual basis at the applicable treasury rate (as defined in the Indenture), plus 15 basis points, or (b) July 15, 2052, in the case of the 2052 Notes, discounted to the redemption date on a semiannual basis at the applicable treasury rate, plus 30 basis points; in either case, the redemption price would include accrued and unpaid interest to the redemption date. At any time on or after January 15, 2052, in the case of the 2052 Notes, TEC may, at its option, redeem the 2052 Notes, in whole or in part, at 100% of the principal amount of such series of the Notes being redeemed plus accrued and unpaid interest thereon to, but excluding, the date of redemption. On July 12, 2024, TEC repaid the $300 million 2024 Notes upon maturity. This note was repaid with proceeds from commercial paper.

Long-Term Debt

12 Months Ended

Dec. 31, 2024

7. Long-Term Debt

A substantial part of Tampa Electric’s tangible assets are pledged as collateral to secure its first mortgage bonds. There are currently no bonds outstanding under Tampa Electric’s first mortgage bond indenture, and Tampa Electric could cause the lien associated with this indenture to be released at any time.

TEC 4.90% Notes due 2029

On January 30, 2024, TEC completed a sale of $500 million aggregate principal amount of 4.90% Notes due March 1, 2029 (the 2029 Notes). Prior to February 1, 2029, in the case of the 2029 Notes, TEC may redeem all or any part of such series of Notes at its option at a redemption price equal to the greater of (i) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date on a semi-annual basis at the Treasury Rate plus 15 basis points less interest accrued to the date of redemption or (ii) 100% of the principal amount of the notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date. On or after February 1, 2029, TEC may redeem the 2029 Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest thereon to the redemption date. TEC used the net proceeds from this offering for the repayment of a portion of the borrowings outstanding under the 5-year credit facility. Therefore, $497 million of borrowings outstanding under the 5-year credit facility were reclassified from notes payable to long-term debt on the Consolidated Balance Sheet as of December 31, 2023.

TEC 3.875% Notes due 2024 and 5.00% Notes due 2052

On July 12, 2022, TEC completed a sale of (i) $300 million aggregate principal amount of 3.875% Notes due July 12, 2024 (the 2024 Notes) and (ii) $300 million aggregate principal amount of 5.00% Notes due July 15, 2052 (the 2052 Notes, and collectively, the Notes). Until July 12, 2024, in the case of the 2024 Notes, or January 15, 2052, in the case of the 2052 Notes, TEC may redeem all or any part of such series of Notes at its option at a redemption price equal to the greater of (i) 100% of the principal amount of such series of Notes to be redeemed or (ii) the sum of the present values of the remaining payments of principal and interest on the Notes to be redeemed that would be due if the Notes matured on (a) July 12, 2024, in the case of the 2024 Notes, discounted to the redemption date on a semiannual basis at the applicable treasury rate (as defined in the Indenture), plus 15 basis points, or (b) July 15, 2052, in the case of the 2052 Notes, discounted to the redemption date on a semiannual basis at the applicable treasury rate, plus 30 basis points; in either case, the redemption price would include accrued and unpaid interest to the redemption date. At any time on or after January 15, 2052, in the case of the 2052 Notes, TEC may, at its option, redeem the 2052 Notes, in whole or in part, at 100% of the principal amount of such series of the Notes being redeemed plus accrued and unpaid interest thereon to, but excluding, the date of redemption. On July 12, 2024, TEC repaid the $300 million 2024 Notes upon maturity. This note was repaid with proceeds from commercial paper.