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Short-term Borrowings and Long-term Debt | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Short-term Borrowings and Long-term Debt | Short-term Borrowings and Long-term Debt Short-term Borrowings and Long-term Debt: As of December 31, 2024 and 2023, the Registrants had the following short-term borrowings and long-term debt outstanding:
| December 31, 2024 |  | December 31, 2023
| Long-Term |  | Current (1) |  | Long-Term |  | Current (1)
| (in millions)
CenterPoint Energy: |  |  |  |  |  |  |
ZENS due 2029 (2) | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 5 |
CenterPoint Energy senior notes 1.45% to 5.25% due 2026 to 2049 | 3,950 |  |  | — |  |  | 3,250 |  |  | 850 |
CenterPoint Energy junior subordinated notes 6.70% to 7.00% due 2055 | 1,300 |  |  | — |  |  | — |  |  | — |
CenterPoint Energy pollution control bonds 5.125% due 2028 (3) | 68 |  |  | — |  |  | 68 |  |  | — |
CenterPoint Energy commercial paper (4) | 382 |  |  | — |  |  | 1,036 |  |  | — |
SIGECO first mortgage bonds 3.450% to 6.00% due 2025 to 2055 (5) | 944 |  |  | 41 |  |  | 825 |  |  | 22 |
SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 (6) | 311 |  |  | 13 |  |  | 324 |  |  | 17 |
Unamortized debt issuance costs | (48) |  |  | — |  |  | (35) |  |  | — |
Unamortized discount and premium, net | (6) |  |  | — |  | (5) |  |  | — |
Houston Electric debt (see details below) | 8,322 |  |  | 500 |  |  | 7,426 |  |  | 161 |
CERC debt (see details below) | 5,174 |  |  | 10 |  |  | 4,670 |  |  | 4 |
Total CenterPoint Energy debt | $ | 20,397 |  |  | $ | 566 |  |  | $ | 17,559 |  |  | $ | 1,059 |
Houston Electric: |  |  |  |  |  |  |
Short Term Borrowings: |  |  |  |  |  |  |
Term loan | $ | — |  |  | $ | 500 |  |  | $ | — |  |  | $ | — |
Long-term debt: |  |  |  |  |  |  |
General mortgage bonds 2.35% to 6.95% due 2026 to 2053 (7) | $ | 8,412 |  |  | $ | — |  |  | $ | 7,512 |  |  | $ | — |
Other | 1 |  |  | — |  |  | 1 |  |  | — |
Bond Company IV: |  |  |  |  |  |  |
Transition bonds 3.028% due 2024 | — |  |  | — |  |  | — |  |  | 161 |
Unamortized debt issuance costs | (62) |  |  | — |  |  | (59) |  |  | — |
Unamortized discount and premium, net | (29) |  |  | — |  |  | (28) |  |  | — |
Total Houston Electric debt | $ | 8,322 |  |  | $ | 500 |  |  | $ | 7,426 |  |  | $ | 161 |
CERC (8): |  |  |  |  |  |  |
Short-term borrowings: |  |  |  |  |  |  |
Inventory financing (9) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Long-term debt: |  |  |  |  |  |  |
Senior notes 1.75% to 6.625% due 2026 to 2047 | $ | 4,520 |  |  | $ | — |  |  | $ | 4,120 |  |  | $ | — |
Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | 86 |  |  | 10 |  |  | 96 |  |  | — |
Commercial paper (4) | 599 |  |  | — |  |  | 484 |  |  | — |
Unamortized debt issuance costs | (31) |  |  | — |  |  | (31) |  |  | — |
Unamortized discount and premium, net | — |  |  | — |  |  | 1 |  |  | — |
Total CERC debt | $ | 5,174 |  |  | $ | 10 |  |  | $ | 4,670 |  |  | $ | 4 |
(1)Includes amounts due or exchangeable within one year of the date noted. (2)CenterPoint Energy’s ZENS obligation is bifurcated into a debt component and an embedded derivative component. For additional information regarding ZENS, see Note 10(b). As ZENS are exchangeable for cash at any time at the option of the holders, these notes are classified as a current portion of long-term debt. (3)These pollution control bonds were secured by general mortgage bonds of Houston Electric as of December 31, 2024 and 2023 and are not reflected in Houston Electric’s consolidated financial statements because of the contingent nature of the obligations. (4)Commercial paper issued by CenterPoint Energy and CERC Corp. has maturities up to 60 days and 30 days, respectively, and are backstopped by the respective issuer’s long-term revolving credit facility. Commercial paper is classified as long-term because the termination date of the facility that backstops the commercial paper is more than one year from the balance sheet date. (5)The first mortgage bonds issued by SIGECO subject SIGECO’s properties to a lien under the related mortgage indenture as further discussed below. (6)Scheduled final payment dates are November 15, 2036 and May 15, 2041. The SIGECO Securitization Bonds will be repaid over time through a securitization charge imposed on retail electric customers in SIGECO’s service territory. (7)The general mortgage bonds issued by Houston Electric subject Houston Electric’s properties to a lien under the General Mortgage as further discussed below. (8)Issued by CERC Corp. (9)Represents AMA transactions accounted for as an inventory financing. Debt Transactions Debt Issuances. During 2024, the following debt instruments were issued or incurred:
Registrant |  | Issuance Date |  | Debt Instrument |  | Aggregate Principal Amount |  | Interest Rate |  | Maturity Date
|  |  |  | (in millions, except for interest rates) |  |
Houston Electric (1) |  | February 2024 |  | General Mortgage Bonds |  | $ | 400 |  |  | 5.15% |  | 2034
Houston Electric (2) |  | June 2024 |  | Term Loan |  | 500 |  |  | SOFR (9) + 1.00% |  | 2025
Houston Electric (3) |  | October 2024 |  | General Mortgage Bonds |  | 500 |  |  | 5.05% |  | 2035
|  |  |  | Total Houston Electric |  | 1,400 |  |  |  |  |
CERC (4) |  | June 2024 |  | Senior Notes |  | 400 |  |  | 5.40% |  | 2034
|  |  |  | Total CERC |  | 400 |  |  |  |  |
CenterPoint Energy (5) |  | May 2024 |  | Senior Notes |  | 700 |  |  | 5.40% |  | 2029
CenterPoint Energy (6) |  | August 2024 |  | First Mortgage Bonds |  | 100 |  |  | 5.18% |  | 2034
CenterPoint Energy (6) |  | August 2024 |  | First Mortgage Bonds |  | 60 |  |  | 5.28% |  | 2036
CenterPoint Energy (7) |  | August 2024 |  | Junior Subordinated Notes |  | 400 |  |  | 7.00% |  | 2055
CenterPoint Energy (7) |  | August 2024 |  | Junior Subordinated Notes |  | 400 |  |  | 6.85% |  | 2055
CenterPoint Energy (8) |  | October 2024 |  | Junior Subordinated Notes |  | 500 |  |  | 6.70% |  | 2055
|  |  |  | Total CenterPoint Energy |  | $ | 3,960 |  |  |  |  |
(1)Total proceeds from Houston Electric’s February 2024 issuance of general mortgage bonds, net of transaction expenses and fees, were approximately $395 million, which were used for general limited liability company purposes, including capital expenditures and working capital purposes. (2)On June 28, 2024, Houston Electric borrowed $100 million aggregate principal amount available under the term loan agreement. In September 2024, Houston Electric borrowed $200 million aggregate principal amount available under the term loan agreement. In November 2024, Houston Electric requested additional commitments under the term loan agreement and borrowed $200 million under the term loan agreement. Houston Electric has used the proceeds thereof for working capital purposes to support liquidity needs from the May 2024 Storm Events and general limited liability company purposes. (3)Total net proceeds from Houston Electric’s October 2024 issuance of general mortgage bonds, net of transaction expenses and fees, were approximately $494 million, which were used for general limited liability company purposes, including capital expenditures and working capital purposes. (4)Total proceeds from CERC’s June 2024 issuance of senior notes, net of transaction expenses and fees, were approximately $396 million which were used for general corporate purposes, including the repayment of a portion of CERC’s outstanding commercial paper. (5)Total proceeds from CenterPoint Energy’s May 2024 issuance of senior notes, net of transaction expenses and fees, were approximately $693 million which were used for general corporate purposes including the redemption of $350 million aggregate principal amount of CenterPoint Energy’s outstanding floating rate senior notes due 2024 and the repayment of a portion of CenterPoint Energy’s outstanding commercial paper. (6)Issued by SIGECO. Total proceeds from SIGECO’s August 2024 issuance of first mortgage bonds, net of transaction expenses and fees, of approximately $159 million were used for general corporate purposes, including repaying short-term debt and long-term debt at maturity or otherwise. See Note 20 for additional information. (7)Total proceeds from CenterPoint Energy’s August 2024 issuance of junior subordinated notes, net of transaction expenses and fees, were approximately $790 million, which were used for general corporate purposes, including the redemption of $500 million aggregate principal amount of CenterPoint Energy’s outstanding 2.50% senior notes due 2024 and the repayment of a portion of CenterPoint Energy’s outstanding commercial paper. (8)Total proceeds from CenterPoint Energy’s October 2024 issuance of junior subordinated notes, net of transaction expenses and fees, were approximately $494 million, which were used for general company purposes including the repayment of a portion of CenterPoint Energy’s outstanding commercial paper. (9)The borrowings under the term loan agreement bear interest at Houston Electric’s option, at a rate equal to either (i) Term SOFR (as defined in the term loan agreement), which includes an adjustment of 0.10% per annum plus a margin of 1.0%, or (ii) the Alternate Base Rate (as defined in the term loan agreement) Junior Subordinated Notes. As described in the table above, in August 2024, CenterPoint Energy issued $400 million aggregate principal amount of Junior Subordinated Series A Notes and $400 million aggregate principal amount of Junior Subordinated Series B Notes. Interest on the August Junior Subordinated Notes accrues from August 14, 2024 and is payable semiannually in arrears on February 15 and August 15 of each year, beginning on February 15, 2025, and maturing on February 15, 2055. The Junior Subordinated Series A Notes bear interest (i) from and including August 14, 2024 to, but excluding, February 15, 2030 at the rate of 7.000% per annum and (ii) from and including February 15, 2030, during each five-year period following February 15, 2030, at a rate per annum equal to the Five-Year Treasury Rate (as defined in the Junior Subordinated Notes Indenture) as of two business days prior to the beginning of the applicable Junior Subordinated Series A Interest Reset Period plus a spread of 3.254%, with such rate per annum to be reset on each five-year anniversary of February 15, 2030. The Junior Subordinated Series B Notes bear interest (i) from and including August 14, 2024, but excluding, February 15, 2035 at the rate of 6.850% per annum and (ii) from and including February 15, 2035, during each five-year period following February 15, 2035, at a rate per annum equal to the Five-Year Treasury Rate (as defined in the Junior Subordinated Notes Indenture) as of two business days prior to the beginning of the applicable Junior Subordinated Series B Interest Reset Period plus a spread of 2.946%, with such rate per annum to be reset on each five-year anniversary of February 15, 2035. As described in the table above, in October 2024, CenterPoint Energy issued $500 million aggregate principal amount of Junior Subordinated Series C Notes. Interest on the Junior Subordinated Series C Notes accrues from October 31, 2024 and is payable semi-annually in arrears on May 15 and November 15 of each year, beginning on May 15, 2025, and maturing on May 15, 2055. The Junior Subordinated Series C Notes bear interest (i) from and including October 31, 2024 to, but excluding May 15, 2030 at the rate of 6.700% per annum and (ii) from and including May 15, 2030, during each five-year period following May 15, 2030 at a rate per annum equal to the Five-Year Treasury Rate (as defined in the Junior Subordinated Notes Indenture) as of two business days prior to the beginning of the applicable Junior Subordinated Series C Interest Reset Period plus a spread of 2.586%, with such rate per annum to be reset on each five-year anniversary of May 15, 2030. So long as no event of default (as defined in the prospectus supplement relating to the offering of the Junior Subordinated Notes) with respect to a given series of Junior Subordinated Notes has occurred and is continuing, CenterPoint Energy may, at its option, defer interest payments on such series of Junior Subordinated Notes, from time to time, for one or more deferral periods of up to 20 consecutive semiannual interest payment periods, except that no such optional deferral period (as defined in the prospectus supplement relating to the offering of the Junior Subordinated Notes) may extend beyond the final maturity date of such series of Junior Subordinated Notes or end on a day other than the day immediately preceding an interest payment date. During any optional deferral period, CenterPoint Energy (and its majority-owned subsidiaries, as applicable) will not (subject to certain exceptions as described in the Junior Subordinated Notes Indenture): (i) declare or pay any dividends or distributions on any of CenterPoint Energy’s capital stock; (ii) redeem, purchase, acquire or make a liquidation payment with respect to any of CenterPoint Energy’s capital stock; (iii) pay any principal, interest (to the extent such interest is deferrable) or premium on, or repay, repurchase or redeem any of CenterPoint Energy’s indebtedness that ranks equally with or junior to the Junior Subordinated Notes in right of payment (including debt securities of other series, such as the other series of the Junior Subordinated Notes issued); or (iv) make any payments with respect to any guarantees by CenterPoint Energy of any indebtedness if such guarantees rank equally with or junior to the Junior Subordinated Notes in right of payment. The Junior Subordinated Notes are CenterPoint Energy’s unsecured obligations and rank junior and subordinate in right of payment to the prior payment in full of CenterPoint Energy’s existing and future Senior Indebtedness (as defined in the Junior Subordinated Notes Indenture). Convertible Senior Notes. Interest on the Convertible Notes is payable semiannually in arrears on February 15 and August 15 of each year, beginning on February 15, 2024. The Convertible Notes will mature on August 15, 2026, unless earlier converted or repurchased by CenterPoint Energy in accordance with their terms. Prior to the close of business on the business day immediately preceding May 15, 2026, the Convertible Notes are convertible only under certain conditions. On or after May 15, 2026 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the Convertible Notes may convert all or any portion of their Convertible Notes at any time at the conversion rate then in effect, irrespective of the conditions. CenterPoint Energy may not redeem the Convertible Notes prior to the maturity date and no sinking fund is provided for the Convertible Notes. Upon conversion of the Convertible Notes, CenterPoint Energy will pay cash up to the aggregate principal amount of the Convertible Notes to be converted and pay or deliver, as the case may be, cash, shares of Common Stock, or a combination of cash and shares of Common Stock, at CenterPoint Energy’s election, in respect of the remainder, if any, of CenterPoint Energy’s conversion obligation in excess of the aggregate principal amount of the Convertible Notes being converted. The conversion rate for the Convertible Notes is initially 27.1278 shares of Common Stock per $1,000 principal amount of Convertible Notes (equivalent to an initial conversion price of approximately $36.86 per share of Common Stock). The initial conversion price of the Convertible Notes represents a premium of approximately 25.0% over the last reported sale price of the Common Stock on the NYSE on August 1, 2023. Initially, a maximum of 33,909,700 shares of Common Stock may be issued upon conversion of the Convertible Notes based on the initial maximum conversion rate of 33.9097 shares of Common Stock per $1,000 principal amount of Convertible Notes. The conversion rate will be subject to adjustment in some events (as described in the Convertible Notes Indenture) but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date of the Convertible Notes, CenterPoint Energy will, in certain circumstances, increase the conversion rate for a holder of Convertible Notes who elects to convert its Convertible Notes in connection with such a corporate event. If CenterPoint Energy undergoes a fundamental change (as defined in the Convertible Notes Indenture), holders of the Convertible Notes may require CenterPoint Energy to repurchase for cash all or any portion of their Convertible Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The Convertible Notes are senior unsecured obligations of CenterPoint Energy and rank senior in right of payment to any of CenterPoint Energy’s indebtedness that is expressly subordinated in right of payment to the Convertible Notes; equal in right of payment to any of CenterPoint Energy’s unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of CenterPoint Energy’s secured indebtedness it may incur in the future to the extent of the value of the assets securing such future secured indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables but excluding intercompany obligations and liabilities of a type not required to be reflected on a balance sheet of such subsidiaries in accordance with generally accepted accounting principles) of CenterPoint Energy’s subsidiaries. Debt Repayments and Redemptions. During 2024, the following debt instruments were repaid at maturity or redeemed prior to maturity:
Registrant |  | Repayment/Redemption Date |  | Debt Instrument |  | Aggregate Principal |  | Interest Rate |  | Maturity Date
|  |  |  |  |  | (in millions) |  |  |  |
CenterPoint Energy (1) |  | March 2024 |  | First Mortgage Bonds |  | $ | 22 |  |  | 3.50% |  | 2024
CenterPoint Energy (2) |  | May 2024 |  | Senior Notes |  | 350 |  |  | SOFR + 0.65% |  | 2024
CenterPoint Energy (3) |  | September 2024 |  | Senior Notes |  | 500 |  |  | 2.50% |  | 2024
|  |  |  | Total CenterPoint Energy |  | $ | 872 |  |  |  |  |
(1) On February 6, 2024, SIGECO provided notice of redemption and on March 1, 2024, SIGECO paid down the outstanding principal of $22 million aggregate principal amount of SIGECO’s outstanding first mortgage bonds due 2024 at a redemption price equal to 100% of the principal amount of the first mortgage bonds to be redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. (2) On May 13, 2024, CenterPoint Energy redeemed $350 million aggregate principal amount of its outstanding floating rate senior notes due 2024 at a redemption price equal to 100% of the principal amount to be redeemed plus accrued and unpaid interest thereon. (3) In September 2024, CenterPoint Energy redeemed $500 million aggregate principal amount of its outstanding 2.50% senior notes due 2024 at a redemption price equal to 100% of the principal amount to be redeemed plus accrued and unpaid interest thereon. CenterPoint Energy and Houston Electric recorded the following losses on early extinguishment of debt, including make-whole premiums and recognition of deferred debt related costs, in Interest expense and other finance charges on their respective Statements of Consolidated Income unless specified otherwise:
|  | Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022
|  | (in millions)
CenterPoint Energy (1) |  | $ | — |  |  | $ | 11 |  |  | $ | 47 |
Houston Electric (2) |  | — |  |  | — |  |  | 2 |
(1) The loss on early extinguishment of debt at CenterPoint Energy during 2023 was recorded as a regulatory asset. (2) The loss on early extinguishment of debt at Houston Electric during 2022 was recorded as a regulatory asset. Securitization Bonds. As of December 31, 2024, CenterPoint Energy, Houston Electric and SIGECO had special purpose subsidiaries including the Bond Companies and the SIGECO Securitization Subsidiary, which are consolidated. The consolidated special purpose subsidiaries are wholly-owned, bankruptcy remote entities that were formed solely for the purpose of securitizing transition property or facilitating the securitization financing of qualified costs in the second quarter of 2023 associated with the completed retirement of SIGECO’s A.B. Brown coal generation facilities through the issuance of securitization bonds and activities incidental thereto. The Securitization Bonds issued by Bond Company IV are payable only through the imposition and collection of transition charges, as defined in the Texas Public Utility Regulatory Act, which are irrevocable, non-bypassable charges to provide recovery of authorized qualified costs. The SIGECO Securitization Bonds are payable only through the imposition of securitization charges payable by SIGECO’s retail electric customers, which are non-bypassable charges to provide recovery of the qualified costs of SIGECO authorized by the IURC order. CenterPoint Energy, Houston Electric and SIGECO have no payment obligations in respect of the Securitization Bonds issued by Bond Company IV or the SIGECO Securitization Bonds other than to remit the applicable transition or securitization charges they collect as set forth in servicing agreements among Houston Electric, the Bond Companies, SIGECO, the SIGECO Securitization Subsidiary and other parties. Each special purpose entity is the sole owner of the right to impose, collect and receive the applicable transition and securitization charges securing the bonds issued by that entity. Creditors of CenterPoint Energy, Houston Electric and SIGECO have no recourse to any assets or revenues of the Bond Companies (including the transition charges) or the SIGECO Securitization Subsidiary, as applicable, and the bondholders have no recourse to the to the general credit of CenterPoint Energy, Houston Electric or SIGECO. Credit Facilities. The Registrants had the following revolving credit facilities as of December 31, 2024:
Registrant |  | Execution Date |  | Size of Facility |  | Draw Rate of SOFR plus (1) |  | Financial Covenant Limit on Debt for Borrowed Money to Capital Ratio |  | Debt for Borrowed Money to Capital Ratio as of December 31, 2024 (2) |  | Termination Date (5)
|  |  |  | (in millions) |  |  |  |  |  |  |  |
CenterPoint Energy |  | December 6, 2022 |  | $ | 2,400 |  |  | 1.500% |  | 65% | (3) | 59.3% |  | December 6, 2027
CenterPoint Energy (4) |  | December 6, 2022 |  | 250 |  |  | 1.125% |  | 65% |  | 44.8% |  | December 6, 2027
Houston Electric |  | December 6, 2022 |  | 300 |  |  | 1.250% |  | 67.5% | (3) | 53.3% |  | December 6, 2027
CERC |  | December 6, 2022 |  | 1,050 |  |  | 1.125% |  | 65% |  | 41.4% |  | December 6, 2027
Total |  |  |  | $ | 4,000 |  |  |  |  |  |  |  |  |
(1)Based on credit ratings as of December 31, 2024. (2)As defined in the revolving credit facility agreement, excluding Securitization Bonds. (3)For CenterPoint Energy and Houston Electric, the financial covenant limit will temporarily increase to 70% if Houston Electric experiences damage from a natural disaster in its service territory and CenterPoint Energy certifies to the administrative agent that Houston Electric has incurred system restoration costs reasonably likely to exceed $100 million in a consecutive 12-month period, all or part of which Houston Electric intends to seek to recover through securitization financing. Such temporary increase in the financial covenant would be in effect from the date CenterPoint Energy delivers its certification until the earliest to occur of (i) the completion of the securitization financing, (ii) the first anniversary of CenterPoint Energy’s certification or (iii) the revocation of such certification. (4)This credit facility was issued by SIGECO. (5)See Note 20 for discussion of subsequent events associated with the revolving credit facilities. The Registrants, as well as the subsidiaries of CenterPoint Energy discussed above, were in compliance with all financial debt covenants as of December 31, 2024. As of December 31, 2024 and 2023, the Registrants had the following revolving credit facilities and utilization of such facilities:
|  | December 31, 2024 |  | December 31, 2023
Registrant |  | Size of Facility |  | Loans |  | Letters of Credit |  | Commercial Paper |  | Weighted Average Interest Rate |  | Size of Facility |  | Loans |  | Letters of Credit |  | Commercial Paper |  | Weighted Average Interest Rate
|  | (in millions, except weighted average interest rate) |  |
CenterPoint Energy (1) |  | $ | 2,400 |  |  | $ | — |  |  | $ | — |  |  | $ | 382 |  |  | 4.59 | % |  | $ | 2,400 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,036 |  |  | 5.54 | %
CenterPoint Energy (2) |  | 250 |  |  | — |  |  | — |  |  | — |  |  | — | % |  | 250 |  |  | — |  |  | — |  |  | — |  |  | — | %
Houston Electric |  | 300 |  |  | — |  |  | — |  |  | — |  |  | — | % |  | 300 |  |  | — |  |  | — |  |  | — |  |  | — | %
CERC |  | 1,050 |  |  | — |  |  | — |  |  | 599 |  |  | 4.62 | % |  | 1,050 |  |  | — |  |  | 1 |  |  | 484 |  |  | 5.53 | %
Total |  | $ | 4,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 981 |  |  |  |  | $ | 4,000 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1,520 |  |  |
(1)CenterPoint Energy’s and CERC’s outstanding commercial paper generally have maturities up to 60 days and 30 days, respectively, and are backstopped by the respective issuer’s long-term revolving credit facility. (2)This credit facility was issued by SIGECO. Maturities. As of December 31, 2024, maturities of long-term debt through 2029, excluding the ZENS obligation and unamortized discounts, premiums and issuance costs, were as follows:
| CenterPoint Energy (1) |  | Houston Electric (1) |  | CERC |  | Securitization Bonds
| (in millions)
2025 | $ | 564 |  |  | $ | 500 |  |  | $ | 10 |  |  | $ | 13 |
2026 | 2,274 |  |  | 300 |  |  | 60 |  |  | 14 |
2027 | 1,320 |  |  | 300 |  |  | 625 |  |  | 14 |
2028 | 2,063 |  |  | 500 |  |  | 1,230 |  |  | 15 |
2029 | 935 |  |  | — |  |  | 30 |  |  | 16 |
(1)These maturities include Securitization Bonds principal repayments on scheduled payment dates. Liens. As of December 31, 2024, Houston Electric’s assets were subject to liens securing approximately $8.4 billion of general mortgage bonds outstanding under the General Mortgage, including approximately $68 million held in trust to secure pollution control bonds that mature in 2028 for which CenterPoint Energy is obligated. The general mortgage bonds that are held in trust to secure pollution control bonds are not reflected in Houston Electric’s consolidated financial statements because of the contingent nature of the obligations. Houston Electric may issue additional general mortgage bonds on the basis of retired bonds, 70% of property additions or cash deposited with the trustee. As of December 31, 2024, approximately $4.7 billion of additional general mortgage bonds could be issued on the basis of retired bonds and 70% of property additions. No first mortgage bonds are outstanding under the M&DOT, and Houston Electric is contractually obligated to not issue any additional first mortgage bonds under the M&DOT and is undertaking actions to release the lien of the M&DOT and terminate the M&DOT. As of December 31, 2024, SIGECO had approximately $985 million aggregate principal amount of first mortgage bonds outstanding. Generally, all of SIGECO’s real and tangible property is subject to the lien of SIGECO’s mortgage indenture which was amended and restated effective as of January 1, 2023. As of December 31, 2024, SIGECO was permitted to issue additional bonds under its mortgage indenture up to 70% of then currently unfunded property additions and approximately $899 million of additional first mortgage bonds could be issued on this basis. Houston Electric and CERC participate in a money pool through which they can borrow or invest on a short-term basis. For additional information, see Note 18.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: 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