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Short-term Borrowings and Long-term Debt | 12 Months Ended
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Dec. 31, 2023
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, 2023 and 2022, the Registrants had the following short-term borrowings and long-term debt outstanding:
| December 31, 2023 |  | December 31, 2022
| Long-Term |  | Current (1) |  | Long-Term |  | Current (1)
| (in millions)
CenterPoint Energy: |  |  |  |  |  |  |
ZENS due 2029 (2) | $ | — |  |  | $ | 5 |  |  | $ | — |  |  | $ | 7 |
CenterPoint Energy senior notes 1.45% to 5.989% due 2024 to 2049 | 3,250 |  |  | 850 |  |  | 3,050 |  |  | — |
CenterPoint Energy pollution control bonds 5.125% due 2028 (3) | 68 |  |  | — |  |  | 68 |  |  | — |
CenterPoint Energy commercial paper (4) | 1,036 |  |  | — |  |  | 1,770 |  |  | — |
SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 (5) | 825 |  |  | 22 |  |  | 277 |  |  | 11 |
SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 (6) | 324 |  |  | 17 |  |  | — |  |  | — |
Other debt | — |  |  | — |  |  | — |  |  | 4 |
Unamortized debt issuance costs | (35) |  |  | — |  |  | (15) |  |  | — |
Unamortized discount and premium, net | (5) |  |  | — |  | (6) |  |  | — |
Houston Electric debt (see details below) | 7,426 |  |  | 161 |  |  | 6,197 |  |  | 156 |
CERC debt (see details below) | 4,670 |  |  | 4 |  |  | 3,495 |  |  | 1,842 |
Total CenterPoint Energy debt | $ | 17,559 |  |  | $ | 1,059 |  |  | $ | 14,836 |  |  | $ | 2,020 |
Houston Electric: |  |  |  |  |  |  |
General mortgage bonds 2.35% to 6.95% due 2026 to 2053 (7) | $ | 7,512 |  |  | $ | — |  |  | $ | 6,112 |  |  | $ | — |
Other | 1 |  |  | — |  |  | 1 |  |  | — |
Bond Company IV: |  |  |  |  |  |  |
Transition bonds 3.028% due 2024 | — |  |  | 161 |  |  | 161 |  |  | 156 |
Unamortized debt issuance costs | (59) |  |  | — |  |  | (50) |  |  | — |
Unamortized discount and premium, net | (28) |  |  | — |  |  | (27) |  |  | — |
Total Houston Electric debt | $ | 7,426 |  |  | $ | 161 |  |  | $ | 6,197 |  |  | $ | 156 |
CERC (8): |  |  |  |  |  |  |
Short-term borrowings: |  |  |  |  |  |  |
Inventory financing (9) | $ | — |  |  | $ | 4 |  |  | $ | — |  |  | $ | 11 |
Term loan | — |  |  | — |  |  | — |  |  | 500 |
Total CERC short-term borrowings | — |  |  | 4 |  |  | — |  |  | 511 |
Long-term debt: |  |  |  |  |  |  |
Senior notes 1.75% to 6.625% due 2026 to 2047 | $ | 4,120 |  |  | $ | — |  |  | $ | 2,620 |  |  | $ | 1,331 |
Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | 96 |  |  | — |  |  | 96 |  |  | — |
Commercial paper (4) | 484 |  |  | — |  |  | 805 |  |  | — |
Unamortized debt issuance costs | (31) |  |  | — |  |  | (22) |  |  | — |
Unamortized discount and premium, net | 1 |  |  | — |  |  | (4) |  |  | — |
Total CERC debt | $ | 4,670 |  |  | $ | 4 |  |  | $ | 3,495 |  |  | $ | 1,842 |
(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 11(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, 2023 and 2022 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 2023, 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) |  | March 2023 |  | General Mortgage Bonds |  | $ | 600 |  |  | 4.95% |  | 2033
Houston Electric (1) |  | March 2023 |  | General Mortgage Bonds |  | 300 |  |  | 5.30% |  | 2053
Houston Electric (2) |  | September 2023 |  | General Mortgage Bonds |  | 500 |  |  | 5.20% |  | 2028
|  |  |  | Total Houston Electric |  | 1,400 |  |  |  |  |
CERC (3) |  | February 2023 |  | Term Loan |  | 500 |  |  | SOFR (4) + 0.85% |  | 2024
CERC (5) |  | February 2023 |  | Senior Notes |  | 600 |  |  | 5.25% |  | 2028
CERC (5) |  | February 2023 |  | Senior Notes |  | 600 |  |  | 5.40% |  | 2033
CERC (6) |  | May 2023 |  | Senior Notes |  | 300 |  |  | 5.25% |  | 2028
|  |  |  | Total CERC |  | 2,000 |  |  |  |  |
CenterPoint Energy (7) |  | March 2023 |  | First Mortgage Bonds |  | 100 |  |  | 4.98% |  | 2028
CenterPoint Energy (7) |  | March 2023 |  | First Mortgage Bonds |  | 80 |  |  | 5.04% |  | 2033
CenterPoint Energy (8) |  | March 2023 |  | Term Loan |  | 250 |  |  | SOFR (4) + 1.50% |  | 2023
CenterPoint Energy (9) |  | June 2023 |  | Securitization Bonds |  | 341 |  |  | 5.026% - 5.172% |  | 2038-2043
CenterPoint Energy (10) |  | August 2023 |  | Convertible Notes |  | 1,000 |  |  | 4.25% |  | 2026
CenterPoint Energy (11) |  | August 2023 |  | Senior Notes |  | 400 |  |  | 5.25% |  | 2026
CenterPoint Energy (12) |  | October 2023 |  | First Mortgage Bonds |  | 470 |  |  | 5.75% - 6.00% |  | 2029-2034
|  |  |  | Total CenterPoint Energy |  | $ | 6,041 |  |  |  |  |
(1)Total proceeds from Houston Electric’s March 2023 issuances of general mortgage bonds, net of transaction expenses and fees, were approximately $890 million. Approximately $593 million of such proceeds were used for general limited liability company purposes, including capital expenditures, working capital and the repayment of all or a portion of Houston Electric’s borrowings under the CenterPoint Energy money pool, and approximately $296 million of such proceeds will be disbursed or allocated to finance or refinance, in part or in full, new or existing projects that meet stated criteria. (2)Total proceeds from Houston Electric’s September 2023 issuances of general mortgage bonds, net of transaction expenses and fees, of approximately $496 million were used for general limited liability company purposes, including capital expenditures, working capital and the repayment of all of Houston Electric’s borrowings under the CenterPoint Energy money pool. (3)Total proceeds, net of transaction expenses and fees, of approximately $500 million were used for general corporate purposes, including the repayment of CERC’s outstanding commercial paper balances. (4)As defined in the term loan agreement, which includes an adjustment of 0.10% per annum. (5)Total proceeds from CERC’s February 2023 issuances of senior notes, net of transaction expenses and fees, of approximately $1.2 billion were used for general corporate purposes, including the repayment of (i) all or a portion of CERC’s outstanding 0.700% senior notes due 2023, (ii) all or a portion of CERC’s outstanding floating rate senior notes due 2023 and (iii) a portion of CERC’s outstanding commercial paper balances. (6)Total proceeds, including issuance premiums and approximately $3 million of accrued interest, and net of transaction expenses and fees, of approximately $308 million were used for general corporate purposes, including repayment of a portion of CERC’s outstanding $500 million term loan due February 2024. (7)Issued by SIGECO. Total proceeds from SIGECO’s March 2023 issuances of first mortgage bonds, net of transaction expenses and fees, of approximately $179 million were used for general corporate purposes, including repaying short-term debt. (8)Total proceeds, net of transaction expenses and fees, of approximately $250 million were used for general corporate purposes, including the repayment of CenterPoint Energy’s outstanding commercial paper balances. The full outstanding amount of the term loan, including accrued and unpaid interest, was repaid in March 2023 and, following the repayment, the term loan agreement was terminated. (9)Issued by SIGECO Securitization Subsidiary. Total proceeds from SIGECO Securitization Subsidiary’s June 2023 issuance of SIGECO Securitization Bonds, net of transaction expenses and fees, of approximately $337 million were used to pay SIGECO the purchase price of the securitization property. SIGECO used the net proceeds from the sale of the securitization property (after payment of upfront financing costs) to reimburse or pay for qualified costs approved by the IURC related to the completed retirement of its A.B. Brown 1 and 2 coal-powered generation units. See Notes 2 and 7 for further details. (10)Total proceeds, net of discounts, transaction fees and expenses, of $985 million were used for general corporate purposes, including the redemption of CenterPoint Energy’s Series A Preferred Stock after its September 1, 2023 redemption date, and the repayment of a portion of CenterPoint Energy’s outstanding commercial paper. See additional information below. (11)Total proceeds, net of discounts, transaction fees and expenses, of $397 million were used for general corporate purposes and the repayment of a portion of CenterPoint Energy’s outstanding commercial paper. (12)SIGECO issued in three tranches: (i) $180 million first mortgage bonds bearing interest at 5.75% due 2029; (ii) $105 million first mortgage bonds bearing interest at 5.91% due 2030; and (iii) $185 million first mortgage bonds bearing interest at 6.00% due 2034. The net proceeds of $467 million were used for general corporate purposes. In April 2023, SIGECO executed a remarketing agreement to remarket five series of tax-exempt debt issued by the Indiana Finance Authority, and secured by SIGECO first mortgage bonds, of approximately $148 million, comprised of: (i) $107 million aggregate principal amount of Environmental Improvement Refunding Revenue Bonds, Series 2013, originally issued by the Indiana Finance Authority on April 26, 2013, and (ii) $41 million aggregate principal amount of Environmental Improvement Refunding Revenue Bonds, Series 2014, originally issued by the Indiana Finance Authority on September 24, 2014, which closed on May 1, 2023. In July 2023, SIGECO executed a remarketing agreement to remarket two series of tax-exempt debt issued by the City of Mount Vernon, Indiana and Warrick County, Indiana, and secured by SIGECO first mortgage bonds, of approximately $38 million, comprised of: (i) $23 million aggregate principal amount of Environmental Improvement Revenue Bonds, Series 2015 issued by the City of Mount Vernon and (ii) $15 million aggregate principal amount of Environmental Improvement Revenue Bonds, Series 2015 issued by Warrick County, which closed on September 1, 2023. Effective September 1, 2023, the bonds of each series bear interest at a fixed rate of 4.250% per annum to the earlier of (i) its redemption date or (ii) September 1, 2028, at which time the bonds are subject to mandatory tender. Convertible Senior Notes. Interest on the Convertible Notes described in the table above 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 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 New York Stock Exchange 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 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 2023, 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) |  |  |  |
CERC |  | March 2023 |  | Term Loan (1) |  | $ | 500 |  |  | SOFR (2) + 0.70% |  | 2023
CERC |  | March 2023 |  | Senior Notes |  | 700 |  |  | 0.70% |  | 2023
CERC |  | March 2023 |  | Floating Rate Senior Notes |  | 575 |  |  | Three-month LIBOR plus 0.5% |  | 2023
CERC |  | May 2023 |  | Term Loan (3) |  | 500 |  |  | SOFR (2) + 0.85% |  | 2024
CERC |  | December 2023 |  | Senior Notes |  | 57 |  |  | 3.72% |  | 2023
|  |  |  | Total CERC |  | 2,332 |  |  |  |  |
CenterPoint Energy (4) |  | January 2023 |  | First Mortgage Bonds |  | 11 |  |  | 4.00% |  | 2044
CenterPoint Energy |  | March 2023 |  | Term Loan (1) |  | 250 |  |  | SOFR (2) + 1.50% |  | 2023
CenterPoint Energy (5) |  | December 2023 |  | Floating Rate Senior Notes |  | 350 |  |  | SOFR plus 0.65% |  | 2024
CenterPoint Energy (6) |  | December 2023 |  | First Mortgage Bonds |  | 80 |  |  | 6.72% |  | 2029
|  |  |  | Total CenterPoint Energy |  | $ | 3,023 |  |  |  |  |
(1) The full outstanding amount of the term loan, including accrued and unpaid interest, was repaid in March 2023 and, following the repayment, the term loan agreement was terminated. (2) As defined in the term loan agreement, which includes an adjustment of 0.10% per annum. (3) The full outstanding amount of the term loan, including accrued and unpaid interest, was repaid in May 2023 and, following the repayment, the term loan agreement was terminated. (4) On December 16, 2022, SIGECO provided notice of redemption and on January 17, 2023, SIGECO redeemed $11 million aggregate principal amount of SIGECO’s outstanding first mortgage bonds due 2044 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. (5) On November 30, 2023, CenterPoint Energy provided notice of redemption and on December 15, 2023, CenterPoint Energy redeemed $350 million aggregate principal amount of outstanding floating rate senior notes due 2024 at a redemption price equal to 100% of the principal amount of the floating rate senior notes to be redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. (6) On November 17, 2023, SIGECO provided notice of redemption and on December 19, 2023, SIGECO redeemed $80 million aggregate principal amount of outstanding first mortgage bonds due 2029 at a redemption price equal to the sum of remaining principal and interest payments discounted at the treasury yield plus 10 basis points, plus interest accrued to the redemption date and an applicable make-whole premium. The Registrants 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,
|  | 2023 |  | 2022 |  | 2021
|  | (in millions)
CenterPoint Energy (1) |  | $ | 11 |  |  | $ | 47 |  |  | $ | 53 |
CERC |  | — |  |  | — |  |  | 11
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, 2023, 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, 2023:
Execution Date |  | Registrant |  | 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, 2023 (2) |  | Termination Date
|  |  |  | (in millions) |  |  |  |  |  |  |  |
December 6, 2022 |  | CenterPoint Energy |  | $ | 2,400 |  |  | 1.500% |  | 65% | (3) | 59.6% |  | December 6, 2027
December 6, 2022 |  | CenterPoint Energy (4) |  | 250 |  |  | 1.125% |  | 65% |  | 46.5% |  | December 6, 2027
December 6, 2022 |  | Houston Electric |  | 300 |  |  | 1.250% |  | 67.5% | (3) | 52.6% |  | December 6, 2027
December 6, 2022 |  | CERC |  | 1,050 |  |  | 1.125% |  | 65% |  | 40.2% |  | December 6, 2027
|  | Total |  | $ | 4,000 |  |  |  |  |  |  |  |  |
(1)Based on credit ratings as of December 31, 2023. (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. The Registrants, as well as the subsidiaries of CenterPoint Energy discussed above, were in compliance with all financial debt covenants as of December 31, 2023. As of December 31, 2023 and 2022, the Registrants had the following revolving credit facilities and utilization of such facilities:
|  | December 31, 2023 |  | December 31, 2022
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 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,036 |  |  | 5.54 | % |  | $ | 2,400 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 1,770 |  |  | 4.71 | %
CenterPoint Energy (2) |  | 250 |  |  | — |  |  | — |  |  | — |  |  | — | % |  | 250 |  |  | — |  |  | — |  |  | — |  |  | — | %
Houston Electric |  | 300 |  |  | — |  |  | — |  |  | — |  |  | — | % |  | 300 |  |  | — |  |  | — |  |  | — |  |  | — | %
CERC |  | 1,050 |  |  | — |  |  | 1 |  |  | 484 |  |  | 5.53 | % |  | 1,050 |  |  | — |  |  | — |  |  | 805 |  |  | 4.67 | %
Total |  | $ | 4,000 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1,520 |  |  |  |  | $ | 4,000 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 2,575 |  |  |
(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, 2023, maturities of long-term debt through 2028, 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)
2024 | $ | 1,050 |  |  | $ | 161 |  |  | $ | — |  |  | $ | 178 |
2025 | 64 |  |  | — |  |  | 10 |  |  | 13 |
2026 | 2,274 |  |  | 300 |  |  | 60 |  |  | 14 |
2027 | 1,860 |  |  | 300 |  |  | 510 |  |  | 14 |
2028 | 2,063 |  |  | 500 |  |  | 1,230 |  |  | 15 |
(1)These maturities include Securitization Bonds principal repayments on scheduled payment dates. Liens. As of December 31, 2023, Houston Electric’s assets were subject to liens securing approximately $7.6 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, 2023, approximately $4.8 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, 2023, SIGECO had approximately $847 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, 2023, SIGECO was permitted to issue additional bonds under its mortgage indenture up to 70% of then currently unfunded property additions and approximately $966 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 19.

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