Ipalco Enterprises 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 05, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Entity Registrant Name	IPALCO ENTERPRISES, INC.
Entity Central Index Key	0000728391
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		108,907,318

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Costs and Expenses	$ 304,348	$ 310,171	$ 891,346	$ 913,768
REVENUES	398,456	385,149	1,121,634	1,099,331
Cost of Revenue [Abstract]
Fuel Costs	93,217	90,599	254,233	252,435
Cost of Goods and Services Sold	31,840	39,267	101,483	131,580
OPERATING EXPENSES:
Utilities Operating Expense, Maintenance and Operations	105,975	109,644	321,782	315,225
Depreciation and amortization	60,373	57,880	179,939	172,492
Taxes other than income taxes	12,943	12,781	33,909	42,036
OPERATING INCOME	94,108	74,978	230,288	185,563
OTHER INCOME / (EXPENSE), NET:
Allowance for equity funds used during construction	810	459	2,538	7,839
Interest Expense	(30,620)	(22,917)	(91,393)	(70,465)
Other Nonoperating Income (Expense)	(2,704)	124	(7,977)	(1,768)
Total other income and (expense), net	(32,514)	(22,334)	(96,832)	(64,394)
EARNINGS FROM OPERATIONS BEFORE INCOME TAX
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	61,594	52,644	133,456	121,169
Income Tax Expense (Benefit)	13,088	10,572	28,252	23,548
NET INCOME	48,506	42,072	105,204	97,621
Less: Dividends on preferred stock	803	803	2,410	2,410
NET INCOME APPLICABLE TO COMMON STOCK	47,703	41,269	102,794	95,211
Electricity [Member]
REVENUES	$ 398,456	$ 385,149	$ 1,121,634	$ 1,099,331

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ (4,322)	$ 0	$ (10,188)	$ 0
Net Income (Loss) Available to Common Stockholders, Basic	47,703	41,269	102,794	95,211
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(12,534)	0	(29,722)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(12,534)	0	(29,722)	0
Other Comprehensive Income (Loss), Net of Tax	(12,534)	0	(29,722)	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 35,169	$ 41,269	$ 73,072	$ 95,211

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 48,413	$ 33,199
Restricted Cash and Cash Equivalents	400	400
Accounts Receivable, Net, Current	172,676	167,559
Inventory, Net	91,980	99,668
Regulatory assets	32,027	28,399
Income Taxes Receivable, Current	24,480	13,773
Other Assets, Current	18,721	15,573
Total current assets	388,697	358,571
UTILITY PLANT:
Property, Plant and Equipment, Gross	6,387,269	6,201,078
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	2,369,515	2,256,215
Utility plant in service - net	4,017,754	3,944,863
Construction in Progress, Gross	102,823	111,723
Total net property, plant and equipment	4,120,577	4,056,586
OTHER ASSETS:
Intangible Assets, Net (Excluding Goodwill)	71,325	40,848
Regulatory assets	372,433	395,077
Other assets - net	15,276	10,971
Assets, Noncurrent	459,034	446,896
TOTAL ASSETS	4,968,308	4,862,053
Debt, Current	469,017	0
CURRENT LIABILITIES:
Accounts payable	121,559	134,931
Accrued taxes	28,848	21,325
Interest Payable, Current	37,755	34,790
Customer deposits	33,727	32,700
Regulatory Liability, Current	54,827	51,024
Accrued Liabilities and Other Liabilities	63,378	27,787
Total current liabilities	809,111	302,557
NON-CURRENT LIABILITIES:
Long-term debt (Note 4)	2,181,948	2,649,064
Deferred income tax liabilities	265,017	253,085
Taxes Payable	4,658	4,658
Regulatory Liability, Noncurrent	864,442	870,255
Accrued pension and other postretirement benefits	23,411	19,329
Asset retirement obligations	207,912	129,451
Other non-current liabilities	239	604
Total non-current liabilities	3,547,627	3,926,446
Liabilities	4,356,738	4,229,003
Common shareholders' equity:
Additional Paid in Capital	597,971	597,824
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,722)	0
Accumulated deficit	(16,463)	(24,558)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	551,786	573,266
Cumulative preferred stock of subsidiary	59,784	59,784
Total common shareholders' equity	611,570	633,050
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,968,308	$ 4,862,053

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATIONS:
Net income	$ 105,204	$ 97,621
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	179,939	172,492
Amortization of redemption premiums and expense on debt	3,081	2,948
Deferred income taxes and investment tax credit adjustments - net	15,109	(16,852)
Allowance for equity funds used during construction	(2,538)	(7,839)
Change in certain assets and liabilities:
Accounts receivable	(5,117)	(7,361)
Inventories	7,688	2,088
Increase (Decrease) in Accounts Payable	(46,063)	(1,620)
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities	3,560	(5,812)
Accrued real estate and personal property taxes	(9,670)	32,787
Accrued interest	2,965	1,037
Pension and other postretirement benefit expenses	4,082	(34,469)
Short-term and long-term regulatory assets and liabilities	2,213	82,306
Increase (Decrease) in Prepaid Expense and Other Assets	3,576	10,679
Other - net	2,895	1,059
Net cash provided by operating activities	259,772	307,706
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(126,066)	(161,830)
Project development costs	(1,268)	(761)
Cost of removal and regulatory recoverable ARO payments	(14,067)	(20,845)
Other	278	1,053
Net cash used in investing activities	(141,123)	(182,383)
CASH FLOWS FROM FINANCING ACTIVITIES:
Short-term debt borrowings	10,000	100,000
Short-term debt repayments	(10,000)	(144,000)
Dividends on common stock	(94,699)	(85,189)
Preferred dividends of subsidiary	(2,410)	(2,410)
Payments for financed capital expenditures	(5,616)	(8,469)
Other	(710)	(191)
Net cash used in financing activities	(103,435)	(140,259)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	15,214	(14,936)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	48,813	15,745
Supplemental disclosures of cash flow information:
Capital Expenditures Incurred but Not yet Paid	13,115	41,109
Cash paid during the period for:
Income Taxes Paid, Net	23,600	15,800
Interest (net of amount capitalized)	$ 85,602	$ 66,177

Unaudited Condensed Consolida_5

Unaudited Condensed Consolidated Statements of Common Stockholders' Equity ( Deficit) Statement - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Cumulative Preferred Stock Of Subsidiary [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 572,276	$ 597,467		$ (25,191)	$ 59,784
Net Income (Loss) Available to Common Stockholders, Basic	31,500
Dividends, Common Stock	(25,328)
Stock Issued During Period, Value, Other	125	125
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(25,328)
Other Comprehensive Income (Loss), Net of Tax	0
Net Income (Loss) Available to Common Stockholders, Basic	95,211
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	95,211
Preferred Stock Dividends, Income Statement Impact	2,410
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(2,410)
Payments of Ordinary Dividends, Common Stock	(85,189)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	578,573	597,592		(19,019)	59,784
Net Income (Loss) Available to Common Stockholders, Basic	22,442
Dividends, Common Stock	(25,939)
Stock Issued During Period, Value, Other	79	79
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Payments of Ordinary Dividends, Common Stock	(25,939)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	575,155	597,671		(22,516)	59,784
Other Comprehensive Income (Loss), Net of Tax	0
Net Income (Loss) Available to Common Stockholders, Basic	41,269
Dividends, Common Stock	(33,922)
Stock Issued During Period, Value, Other	65	65
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	41,269
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(33,922)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	582,567	597,736		(15,169)	59,784
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	573,266	597,824		(24,558)	59,784
Other Comprehensive Income (Loss), Net of Tax	(5,539)
Net Income (Loss) Available to Common Stockholders, Basic	40,982
Dividends, Common Stock	(31,590)
Stock Issued During Period, Value, Other	34	34
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	35,443
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(31,590)
Other Comprehensive Income (Loss), Net of Tax	(29,722)
Net Income (Loss) Available to Common Stockholders, Basic	102,794
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	73,072
Preferred Stock Dividends, Income Statement Impact	2,410
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(2,410)
Payments of Ordinary Dividends, Common Stock	(94,699)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	577,153	597,858	$ (5,539)	(15,166)	59,784
Other Comprehensive Income (Loss), Net of Tax	(11,649)
Net Income (Loss) Available to Common Stockholders, Basic	14,109
Dividends, Common Stock	(28,345)
Stock Issued During Period, Value, Other	59	59
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,460
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Payments of Ordinary Dividends, Common Stock	(28,345)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	551,327	597,917	(17,188)	(29,402)	59,784
Other Comprehensive Income (Loss), Net of Tax	(12,534)
Net Income (Loss) Available to Common Stockholders, Basic	47,703
Dividends, Common Stock	(34,764)
Stock Issued During Period, Value, Other	54	54
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	35,169
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(34,764)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 551,786	$ 597,971	$ (29,722)	$ (16,463)	$ 59,784

Unaudited Condensed Consolida_6

Unaudited Condensed Consolidated Statements of comprehensive Income/ (loss) Parenthetical (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Unaudited Condensed Consolidated Statement of Other Comprehensive Income / (Loss) Parenthetical [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ (4,322)	$ 0	$ (10,188)	$ 0

Overview and Summary Of Signifi

Overview and Summary Of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Overview and Summary Of Significant Accounting Policies	OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES IPALCO is a holding company incorporated under the laws of the state of Indiana. IPALCO is owned by AES U.S. Investments ( 82.35% ) and CDPQ ( 17.65% ). AES U.S. Investments is owned by AES U.S. Holdings, LLC ( 85% ) and CDPQ ( 15% ). IPALCO owns all of the outstanding common stock of IPL. Substantially all of IPALCO’s business consists of generating, transmitting, distributing and selling of electric energy conducted through its principal subsidiary, IPL. IPL was incorporated under the laws of the state of Indiana in 1926. IPL has more than 500,000 retail customers in the city of Indianapolis and neighboring cities, towns and communities, and adjacent rural areas all within the state of Indiana, with the most distant point being approximately forty miles from Indianapolis. IPL has an exclusive right to provide electric service to those customers. IPL owns and operates four generating stations, all within the state of Indiana. IPL’s largest generating station, Petersburg, is coal-fired. The second largest station, Harding Street, uses natural gas and fuel oil to power combustion turbines. In addition, IPL operates a 20 MW battery energy storage unit at this location, which provides frequency response. The third station, Eagle Valley, is a CCGT natural gas plant. IPL took operational control and commenced commercial operations of this CCGT plant in April 2018. The fourth station, Georgetown, is a small peaking station that uses natural gas to power combustion turbines. As of September 30, 2019 , IPL’s net electric generation capacity for winter is 3,705 MW and net summer capacity is 3,560 MW. Principles of Consolidation The accompanying Financial Statements include the accounts of IPALCO, IPL and Mid-America Capital Resources, Inc., a non-regulated wholly-owned subsidiary of IPALCO. All significant intercompany amounts have been eliminated. The accompanying Financial Statements are unaudited; however, they have been prepared in accordance with GAAP for interim financial information and in conjunction with the rules and regulations of the SEC. Accordingly, they do not include all of the disclosures required by GAAP for annual fiscal reporting periods. In the opinion of management, all adjustments of a normal recurring nature necessary for fair presentation have been included. The electric utility business is affected by seasonal weather patterns throughout the year and, therefore, the operating revenues and associated operating expenses are not generated evenly by month during the year. These unaudited Financial Statements have been prepared in accordance with the accounting policies described in IPALCO’s 2018 Form 10-K and should be read in conjunction therewith. Use of Management Estimates The preparation of financial statements in conformity with GAAP requires that management make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The reported amounts of revenues and expenses during the reporting period may also be affected by the estimates and assumptions that management is required to make. Actual results may differ from those estimates. Reclassifications Certain immaterial amounts from prior periods have been reclassified to conform to the current year presentation. Cash, Cash Equivalents and Restricted Cash The following table provides a summary of cash, cash equivalents and restricted cash amounts as shown on the Condensed Consolidated Statements of Cash Flows: September 30, December 31, 2019 2018 (In Thousands) Cash, cash equivalents and restricted cash Cash and cash equivalents $ 48,413 $ 33,199 Restricted cash 400 400 Total cash, cash equivalents and restricted cash $ 48,813 $ 33,599 Accounts Receivable The following table summarizes our accounts receivable balances at September 30, 2019 and December 31, 2018 : September 30, December 31, 2019 2018 (In Thousands) Accounts receivable, net Customer receivables $ 96,919 $ 91,426 Unbilled revenue 66,670 68,893 Amounts due from related parties 4,949 5,720 Other 7,165 4,341 Provision for uncollectible accounts (3,027 ) (2,821 ) Total accounts receivable, net $ 172,676 $ 167,559 Inventories The following table summarizes our inventories balances at September 30, 2019 and December 31, 2018 : September 30, December 31, 2019 2018 (In Thousands) Inventories Fuel $ 29,981 $ 32,457 Materials and supplies 61,999 67,211 Total inventories $ 91,980 $ 99,668 Financial Derivatives All derivatives are recognized as either assets or liabilities in the balance sheets and are measured at fair value. Changes in the fair value are recorded in earnings unless the derivative is designated as a cash flow hedge of a forecasted transaction or it qualifies for the normal purchases and sales exception. We use interest rate hedges to manage the interest rate risk of our variable rate debt. We use cash flow hedge accounting when the hedge or a portion of the hedge is deemed to be highly effective, which results in changes in the fair value being recorded within accumulated other comprehensive income, a component of shareholders' equity. We have elected not to offset net derivative positions in the Financial Statements. Accordingly, we do not offset such derivative positions against the fair value of amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral under master netting agreements. See Note 3, “Derivative Instruments and Hedging Activities” for additional information. ARO During the nine months ended September 30, 2019 , IPL recorded adjustments to its ARO liabilities of $80.4 million primarily to reflect an increase to estimated ash pond closure costs, including groundwater remediation. The following is a roll forward of the ARO legal liability for the nine months ended September 30, 2019 (in thousands): Balance as of January 1, 2019 $ 129,451 Revisions to cash flow and timing estimates 80,406 Liabilities settled (8,373 ) Accretion expense 6,428 Balance as of September 30, 2019 $ 207,912 Accumulated Other Comprehensive Income / (Loss) The changes in the components of Accumulated Other Comprehensive Income/(Loss) during the nine months ended September 30, 2019 are as follows: Gains and losses on cash flow hedges (In Thousands) Balance at January 1, 2019 $ — Other comprehensive loss (29,722 ) Balance at September 30, 2019 $ (29,722 ) New Accounting Pronouncements Adopted in 2019 The following table provides a brief description of recent accounting pronouncements that had an impact on the Company’s Financial Statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or did not have a material impact on the Company’s Financial Statements. New Accounting Standards Adopted ASU Number and Name Description Date of Adoption Effect on the Financial Statements upon adoption 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities The standard updates the hedge accounting model to expand the ability to hedge nonfinancial and financial risk components, reduce complexity, and ease certain documentation and assessment requirements. When facts and circumstances are the same as at the previous quantitative test, a subsequent quantitative effectiveness test is not required. The standard also eliminates the requirement to separately measure and report hedge ineffectiveness. For cash flow hedges, this means that the entire change in the fair value of a hedging instrument will be recorded in other comprehensive income and amounts deferred will be reclassified to earnings in the same income statement line as the hedged item. Transition method: modified retrospective with the cumulative effect adjustment recorded to the opening balance of retained earnings as of the initial application date. Prospective for presentation and disclosures. January 1, 2019 The adoption of this standard did not have a material impact on the Financial Statements. 2016-02, 2018-01, 2018-10, 2018-11, 2018-20, 2019-01, Leases (Topic 842) See discussion of the ASUs below. January 1, 2019 See impact upon adoption of the standard below. On January 1, 2019, the Company adopted ASC 842 Leases and its subsequent corresponding updates (“ASC 842”). Under this standard, lessees are required to recognize assets and liabilities for most leases on the balance sheet, and recognize expenses in a manner similar to the current accounting method. For lessors, the guidance modifies the lease classification criteria and the accounting for sales-type and direct financing leases. The guidance eliminates previous real estate-specific provisions. Under ASC 842, fewer of our contracts contain a lease. However, due to the elimination of the real estate-specific guidance and changes to certain lessor classification criteria, more leases qualify as sales-type leases and direct financing leases. Under these two models, a lessor derecognizes the asset and recognizes a lease receivable. According to ASC 842, the lease receivable includes the fair value of the asset after the contract period, but does not include variable payments such as margin on the sale of energy. Therefore, the lease receivable could be significantly different than the carrying amount of the underlying asset at lease commencement. In such circumstances, the difference between the initially recognized lease receivable and the carrying amount of the underlying asset is recognized as a gain/loss at lease commencement. During the course of adopting ASC 842, the Company applied various practical expedients including: • The package of practical expedients (applied to all leases) that allowed lessees and lessors not to reassess: a. whether any expired or existing contracts are or contain leases, b. lease classification for any expired or existing leases, and c. whether initial direct costs for any expired or existing leases qualify for capitalization under ASC 842. • The transition practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements, and • The transition practical expedient for lessees that allowed businesses to not separate lease and non-lease components. The Company applied the practical expedient to all classes of underlying assets when valuing right-of-use assets and lease liabilities. Contracts where the Company is the lessor were separated between the lease and non-lease components. The Company applied the modified retrospective method of adoption and elected to continue to apply the guidance in ASC 840 Leases to the comparative periods presented in the year of adoption. Under this transition method, the Company applied the transition provisions starting at the date of adoption. The adoption of ASC 842 did not have a material impact on our Financial Statements. New Accounting Pronouncements Issued But Not Yet Effective The following table provides a brief description of recent accounting pronouncements that could have a material impact on the Company’s Financial Statements once adopted. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on the Company’s Financial Statements. New Accounting Standards Issued But Not Yet Effective ASU Number and Name Description Date of Adoption Effect on the Financial Statements upon adoption 2016-13, 2018-19, 2019-04, 2019-05, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments See discussion of the ASU below. January 1, 2020. Early adoption is permitted only as of January 1, 2019. The Company will adopt the standard on January 1, 2020; see below for the evaluation of the impact of the adoption on the standard on the Financial Statements. ASU 2016-13 and its subsequent corresponding updates will update the impairment model for financial assets measured at amortized cost, known as the Current Expected Credit Loss ("CECL") model. For trade and other receivables, held-to-maturity debt securities, loans and other instruments, entities will be required to use a new forward-looking "expected loss" model that generally will result in the earlier recognition of allowance for losses. For available-for-sale debt securities with unrealized losses, entities will measure credit loses as it is done today, except that the losses will be recognized as an allowance rather than a reduction in the amortized cost of the securities. There are various transition methods available upon adoption. The Company is currently evaluating the impact of adopting the standard on its Financial Statements; however, it is expected that the new current expected credit loss model will primarily impact the calculation of the Company's expected credit losses on $175.7 million

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE The fair value of financial assets and liabilities approximate their reported carrying amounts. The estimated fair values of the Company’s assets and liabilities have been determined using available market information. As these amounts are estimates and based on hypothetical transactions to sell assets or transfer liabilities, the use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. For further information on our valuation techniques and policies, see Note 4, " Fair Value" to IPALCO’s 2018 Form 10-K. VEBA Assets IPL has VEBA investments that are to be used to fund certain employee postretirement health care benefit plans. These assets are primarily comprised of open-ended mutual funds, which are valued using the net assets value per unit. These investments are recorded at fair value within " Other non-current assets " on the accompanying Unaudited Condensed Consolidated Balance Sheets and classified as equity securities. ASU 2016-01 “ Recognition and Measurement of Financial Assets and Financial Liabilities ” was effective as of January 1, 2018. This ASU requires the change in the fair value of equity instruments to be recorded in income. Equity Instruments were defined to include all mutual funds, regardless of the underlying investments. Therefore, all changes to fair value on the VEBA investments are included in income in the period that the changes occur. These changes to fair value were not material for the periods covered by this report. Any unrealized gains or losses are recorded in our Unaudited Condensed Consolidated Statements of Operations. FTRs In connection with IPL’s participation in MISO, in the second quarter of each year IPL is granted financial instruments that can be converted into cash or FTRs based on IPL’s forecasted peak load for the period. FTRs are used in the MISO market to hedge IPL’s exposure to congestion charges, which result from constraints on the transmission system. IPL’s FTRs are valued at the cleared auction prices for FTRs in MISO’s annual auction. Because of the infrequent nature of this valuation, the fair value assigned to the FTRs is considered a Level 3 input under the fair value hierarchy required by ASC 820. An offsetting regulatory liability has been recorded as these revenues or costs will be flowed through to customers through the FAC. As such, there is no impact on our Unaudited Condensed Consolidated Statements of Operations. Interest Rate Hedges In March 2019, we entered into forward interest rate hedges related to the 2020 IPALCO Notes and Term Loan that have maturities in July 2020. The interest rate hedges have a combined notional amount of $400.0 million , which will settle when we refinance the debt. All changes in the market value of the interest rate hedges are recorded in AOCI. The AOCI associated with the final settlement will be amortized out of AOCI into interest expense over the remaining life of the underlying debt. See also Note 3, " Derivative Instruments and Hedging Activities - Cash Flow Hedges " for further information. Recurring Fair Value Measurements The fair value of assets and liabilities at September 30, 2019 and December 31, 2018 measured on a recurring basis and the respective category within the fair value hierarchy for IPALCO was determined as follows: Assets and Liabilities at Fair Value Level 1 Level 2 Level 3 Fair value at September 30, 2019 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 20 $ 20 $ — $ — Mutual funds 2,752 — 2,752 — Total VEBA investments 2,772 20 2,752 — Financial transmission rights 1,668 — — 1,668 Total financial assets measured at fair value $ 4,440 $ 20 $ 2,752 $ 1,668 Financial liabilities: Interest rate hedges $ 39,909 $ — $ 39,909 $ — Total financial liabilities measured at fair value $ 39,909 $ — $ 39,909 $ — Assets and Liabilities at Fair Value Level 1 Level 2 Level 3 Fair value at December 31, 2018 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 21 $ 21 $ — $ — Mutual funds 2,565 — 2,565 — Total VEBA investments 2,586 21 2,565 — Financial transmission rights 3,099 — — 3,099 Total financial assets measured at fair value $ 5,685 $ 21 $ 2,565 $ 3,099 Financial liabilities: Other derivative liabilities $ 53 $ — $ — $ 53 Total financial liabilities measured at fair value $ 53 $ — $ — $ 53 Financial Instruments not Measured at Fair Value in the Consolidated Balance Sheets Debt The fair value of our outstanding fixed-rate debt has been determined on the basis of the quoted market prices of the specific securities issued and outstanding. In certain circumstances, the market for such securities was inactive and therefore the valuation was adjusted to consider changes in market spreads for similar securities. Accordingly, the purpose of this disclosure is not to approximate the value on the basis of how the debt might be refinanced. The following table shows the face value and the fair value of fixed-rate and variable-rate indebtedness (Level 2) for the periods ending: September 30, 2019 December 31, 2018 Face Value Fair Value Face Value Fair Value (In Thousands) Fixed-rate $ 2,523,800 $ 2,891,692 $ 2,523,800 $ 2,649,265 Variable-rate 155,000 155,000 155,000 155,000 Total indebtedness $ 2,678,800 $ 3,046,692 $ 2,678,800 $ 2,804,265 The difference between the face value and the carrying value of this indebtedness consists of the following: • unamortized deferred financing costs of $21.3 million and $23.0 million at September 30, 2019 and December 31, 2018 , respectively; and • unamortized discounts of $6.5 million and $6.7 million at September 30, 2019 and December 31, 2018 , respectively.

Debt

Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Indebtedness	DEBT Long-Term Debt The following table presents our long-term debt: September 30, December 31, Series Due 2019 2018 (In Thousands) IPL first mortgage bonds: 3.875% (1) August 2021 $ 55,000 $ 55,000 3.875% (1) August 2021 40,000 40,000 3.125% (1) December 2024 40,000 40,000 6.60% January 2034 100,000 100,000 6.05% October 2036 158,800 158,800 6.60% June 2037 165,000 165,000 4.875% November 2041 140,000 140,000 4.65% June 2043 170,000 170,000 4.50% June 2044 130,000 130,000 4.70% September 2045 260,000 260,000 4.05% May 2046 350,000 350,000 4.875% November 2048 105,000 105,000 Unamortized discount – net (6,189 ) (6,272 ) Deferred financing costs (16,769 ) (17,115 ) Total IPL first mortgage bonds 1,690,842 1,690,413 IPL unsecured debt: Variable (2) December 2020 30,000 30,000 Variable (2) December 2020 60,000 60,000 Deferred financing costs (143 ) (229 ) Total IPL unsecured debt 89,857 89,771 Total Long-term Debt – IPL 1,780,699 1,780,184 Long-term Debt – IPALCO: Term Loan July 2020 65,000 65,000 3.45% Senior Secured Notes July 2020 405,000 405,000 3.70% Senior Secured Notes September 2024 405,000 405,000 Unamortized discount – net (341 ) (424 ) Deferred financing costs (4,393 ) (5,696 ) Total Long-term Debt – IPALCO 870,266 868,880 Total Consolidated IPALCO Long-term Debt 2,650,965 2,649,064 Less: Current Portion of Long-term Debt 469,017 — Net Consolidated IPALCO Long-term Debt $ 2,181,948 $ 2,649,064 (1) First mortgage bonds issued to the Indiana Finance Authority to secure the loan of proceeds from tax-exempt bonds issued by the Indiana Finance Authority. (2) Unsecured notes issued to the Indiana Finance Authority by IPL to facilitate the loan of proceeds from various tax-exempt notes issued by the Indiana Finance Authority. The notes have a final maturity date of December 2038, but are subject to a mandatory put in December 2020. IPALCO’s Senior Secured Notes and Term Loan IPALCO has $405 million of 3.45% Senior Secured Notes due July 15, 2020 ("2020 IPALCO Notes") and a $65 million Term Loan due July 1, 2020. Although current liquid funds are not sufficient to pay the collective amounts due under the 2020 IPALCO Notes and Term Loan at their maturities, we believe that we will be able to refinance the 2020 IPALCO Notes and Term Loan based on our conversations with investment bankers, which currently indicate more than adequate demand for new IPALCO debt at our current credit ratings, and our previous successful issuance of our $405 million IPALCO senior secured notes in 2017, which served to refinance notes existing at the time. Should the capital markets not be accessible to us at the time of the maturity of the 2020 IPALCO Notes and Term Loan, management believes that other financing options are at its disposal to meet the needs of the maturities. Line of Credit IPL entered into an amendment and restatement of its 5 -year $250 million revolving credit facility (the "Credit Agreement") on June 19, 2019 with a syndication of bank lenders. This Credit Agreement is an unsecured committed line of credit to be used: (i) to finance capital expenditures; (ii) to refinance certain existing indebtedness under the existing Credit Agreement, (iii) to support working capital; and (iv) for general corporate purposes. This agreement matures on June 19, 2024, and bears interest at variable rates as described in the Credit Agreement. It includes an uncommitted $150 million accordion feature to provide IPL with an option to request an increase in the size of the facility at any time prior to June 19, 2023, subject to approval by the lenders. The Credit Agreement also includes two one-year extension options, allowing IPL to extend the maturity date subject to approval by the lenders. Prior to execution, IPL and IPALCO had existing general banking relationships with the parties to the Credit Agreement. IPL had no outstanding borrowings on the committed line of credit as of September 30, 2019 or December 31, 2018 .

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Notes)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	3. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES We use derivatives principally to manage the interest rate risk associated with refinancing our long-term debt. The derivatives that we use to economically hedge these risks are governed by our risk management policies for forward and futures contracts. Our net positions are continually assessed within our structured hedging programs to determine whether new or offsetting transactions are required. We monitor and value derivative positions monthly as part of our risk management processes. We use published sources for pricing, when possible, to mark positions to market. All of our derivative instruments are used for risk management purposes and are designated as cash flow hedges if they qualify under ASC 815 for accounting purposes. At September 30, 2019 , IPL's outstanding derivative instruments were as follows: Commodity Accounting Treatment (a) Unit Purchases (in thousands) Sales (in thousands) Net Purchases/(Sales) (in thousands) Interest rate hedges Designated USD $ 400,000 $ — $ 400,000 FTRs Not Designated MWh 9,131 — 9,131 (a) Refers to whether the derivative instruments have been designated as a cash flow hedge. Cash Flow Hedges As part of our risk management processes, we identify the relationships between hedging instruments and hedged items, as well as the risk management objective and strategy for undertaking various hedge transactions. The fair values of cash flow hedges determined by current public market prices will continue to fluctuate with changes in market prices up to contract expiration. With the adoption of ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted improvements to Accounting for Hedging Activities effective January 1, 2019, we are no longer required to calculate effectiveness and thus the entire change in the fair value of a hedging instrument is now recorded in other comprehensive income and amounts deferred are reclassified to earnings in the same income statement line as the hedged item in the period in which it settles. In March 2019, we entered into three forward interest rate swaps to hedge the interest risk associated with refinancing future debt. The three interest rate swaps have a combined notional amount of $400.0 million and will be settled when the associated debt is refinanced. The AOCI associated with the interest rate swaps will be amortized out of AOCI into interest expense over the remaining life of the underlying debt. We use the income approach to value the swaps, which consists of forecasting future cash flows based on contractual notional amounts and applicable and available market data as of the valuation date. The most common market data inputs used in the income approach include volatilities, spot and forward benchmark interest rates (LIBOR). Forward rates with the same tenor as the derivative instrument being valued are generally obtained from published sources, with these forward rates being assessed quarterly at a portfolio-level for reasonableness versus comparable published rates. We will reclassify gains and losses on the swaps out of AOCI and into earnings in those periods in which hedged interest payments occur. The following tables provide information on gains or losses recognized in AOCI for the cash flow hedges for the period indicated: Interest Rate Hedges for the Nine Months Ended September 30, 2019 $ in thousands (net of tax) Beginning accumulated derivative gain / (loss) in AOCI $ — Net losses associated with current period hedging transactions (29,722 ) Ending accumulated derivative loss in AOCI $ (29,722 ) Portion expected to be reclassified to earnings in the next twelve months $ — Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months) 10 Derivatives Not Designated as Hedge FTRs do not qualify for hedge accounting or the normal purchases and sales exceptions under ASC 815. Accordingly, such contracts are recorded at fair value when acquired and subsequently amortized over the annual period as they are used. FTRs are initially recorded at fair value using the income approach. When applicable, IPALCO has elected not to offset derivative assets and liabilities and not to offset net derivative positions against the right to reclaim cash collateral pledged (an asset) or the obligation to return cash collateral received (a liability) under derivative agreements. As of September 30, 2019

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Effective Tax Rate IPALCO’s effective combined state and federal income tax rate was 21.2% and 21.2% for the three and nine months ended September 30, 2019 , respectively, as compared to 20.4% and 19.8% for the three and nine months ended September 30, 2018 , respectively. The increases in the effective tax rates versus the comparable periods were primarily due to decreases in tax benefits resulting from the lower allowance for equity funds used during construction versus the comparable periods.

Benefit Plans

Benefit Plans	9 Months Ended
	Sep. 30, 2019
Retirement Benefits [Abstract]
Benefit Plans	BENEFIT PLANS The following table (in thousands) presents information for the nine months ended September 30, 2019 , relating to the Pension Plans: Net unfunded status of plans: Net unfunded status at December 31, 2018 $ (12,743 ) Net benefit cost components reflected in net unfunded status during first quarter: Service cost (1,853 ) Interest cost (6,836 ) Expected return on assets 7,477 Net unfunded status at March 31, 2019 $ (13,955 ) Net benefit cost components reflected in net unfunded status during second quarter: Service cost (1,852 ) Interest cost (6,836 ) Expected return on assets 7,477 Net unfunded status at June 30, 2019 $ (15,166 ) Net benefit cost components reflected in net unfunded status during third quarter: Service cost (1,853 ) Interest cost (6,836 ) Expected return on assets 7,477 Net unfunded status at September 30, 2019 $ (16,378 ) Regulatory assets related to pensions (1) : Regulatory assets at December 31, 2018 $ 201,452 Amount reclassified through net benefit cost: Amortization of prior service cost (956 ) Amortization of net actuarial loss (2,771 ) Regulatory assets at March 31, 2019 $ 197,725 Amount reclassified through net benefit cost: Amortization of prior service cost (957 ) Amortization of net actuarial loss (2,770 ) Regulatory assets at June 30, 2019 $ 193,998 Amount reclassified through net benefit cost: Amortization of prior service cost (956 ) Amortization of net actuarial loss (2,770 ) Regulatory assets at September 30, 2019 $ 190,272 (1) Amounts that would otherwise be charged/credited to Accumulated Other Comprehensive Income or Loss upon application of ASC 715, “Compensation – Retirement Benefits,” are recorded as a regulatory asset or liability because IPL has historically recovered and currently recovers pension and other postretirement benefit expenses in rates. These are unrecognized amounts not yet recognized as components of net periodic benefit costs. Pension Expense The following table presents net periodic benefit cost information relating to the Pension Plans combined: For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 (In Thousands) (In Thousands) Components of net periodic benefit cost: Service cost $ 1,853 $ 2,112 $ 5,558 $ 6,338 Interest cost 6,836 6,305 20,508 18,915 Expected return on plan assets (7,477 ) (10,200 ) (22,431 ) (30,600 ) Amortization of prior service cost 956 959 2,869 2,878 Amortization of actuarial loss 2,770 2,851 8,311 8,552 Curtailments (1) — — — 1,230 Net periodic benefit cost $ 4,938 $ 2,027 $ 14,815 $ 7,313 (1) As a result of the announced AES restructuring in the first quarter of 2018, we recognized a plan curtailment of $1.2 million for the nine months ended September 30, 2018. In addition, IPL provides postretirement health care benefits to certain active or retired employees and the spouses of certain active or retired employees. These postretirement health care benefits and the related unfunded obligation of $7.1 million and $6.7 million at September 30, 2019 and December 31, 2018 , respectively, were not material to the Financial Statements in the periods covered by this report.

Commitments And Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES Legal Loss Contingencies IPALCO and IPL are involved in litigation arising in the normal course of business. While the results of such litigation cannot be predicted with certainty, management believes that the final outcome will not have a material adverse effect on IPALCO’s results of operations, financial condition and cash flows. Amounts accrued or expensed for legal or environmental contingencies collectively during the periods covered by this report have not been material to the Financial Statements. Environmental Loss Contingencies We are subject to various federal, state, regional and local environmental protection and health and safety laws and regulations governing, among other things, the generation, storage, handling, use, disposal and transportation of regulated materials, including ash; the use and discharge of water used in generation boilers and for cooling purposes; the emission and discharge of hazardous and other materials into the environment; and the health and safety of our employees. These laws and regulations often require a lengthy and complex process of obtaining and renewing permits and other governmental authorizations from federal, state and local agencies. Violation of these laws, regulations or permits can result in substantial fines, other sanctions, permit revocation and/or facility shutdowns. We cannot provide assurance that we have been or will be at all times in full compliance with such laws, regulations and permits. New Source Review and Other CAA NOVs In October 2009, IPL received a NOV and Finding of Violation from the EPA pursuant to the CAA Section 113(a). The NOV alleges violations of the CAA at IPL’s three primarily coal-fired electric generating facilities at the time, dating back to 1986. The alleged violations primarily pertain to the PSD and nonattainment New Source Review requirements under the CAA. In addition, on October 1, 2015, IPL received a NOV from the EPA pursuant to CAA Section 113(a) alleging violations of the CAA, the Indiana SIP, and the Title V operating permit related to alleged particulate matter and opacity violations at IPL Petersburg Unit 3. Also, on February 5, 2016, the EPA issued a NOV pursuant to CAA Section 113(a) alleging violations of New Source Review and other CAA regulations, the Indiana SIP, and the Title V operating permit at Petersburg Generating Station. Since receiving the letters, IPL management has met with the EPA staff regarding possible resolutions of the NOVs. Settlements and litigated outcomes of similar New Source Review cases have required companies to pay civil penalties, install additional pollution control technology in coal-fired electric generating units, retire existing generating units, and invest in additional environmental projects. A similar outcome in these cases could have a material impact on our business. At this time, we cannot determine whether these NOVs will have a material impact on our business, financial condition and results of operations. We would seek recovery of any operating or capital expenditures, but not fines or penalties, related to air pollution control technology to reduce regulated air emissions; however, there can be no assurances that we would be successful in recovering any operating or capital expenditures. IPL has recorded a contingent liability related to these New Source Review cases and other CAA NOV matters.

Business Segment Information (N

Business Segment Information (Notes)	9 Months Ended
	Sep. 30, 2019
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	BUSINESS SEGMENT INFORMATION Operating segments are components of an enterprise that engage in business activities from which it may earn revenues and incur expenses, for which separate financial information is available, and is evaluated regularly by the chief operating decision maker in assessing performance and deciding how to allocate resources. Substantially all of our business consists of the generation, transmission, distribution and sale of electric energy conducted through IPL which is a vertically integrated electric utility. IPALCO’s reportable business segment is its utility segment, with all other nonutility business activities aggregated separately. The “All Other” nonutility category primarily includes the Term Loan, 2020 IPALCO Notes and 2024 IPALCO Notes; approximately $11.8 million and $6.4 million of cash and cash equivalents as of September 30, 2019 and December 31, 2018 , respectively; long-term investments of $2.7 million and $4.0 million at September 30, 2019 and December 31, 2018 , respectively; long-term liabilities for interest rate hedges of $39.9 million and $0 million as of September 30, 2019 and December 31, 2018 , respectively; and income taxes and interest related to those items. All other assets represented less than 1% of IPALCO’s total assets as of September 30, 2019 and December 31, 2018 . The accounting policies of the identified segment are consistent with those policies and procedures described in the summary of significant accounting policies. The following table provides information about IPALCO’s business segments (in thousands): Three Months Ended Three Months Ended September 30, 2019 September 30, 2018 Utility All Other Total Utility All Other Total Revenues $ 398,456 $ — $ 398,456 $ 385,149 $ — $ 385,149 Depreciation and amortization $ 60,373 $ — $ 60,373 $ 57,880 $ — $ 57,880 Interest expense $ 22,244 $ 8,376 $ 30,620 $ 15,255 $ 7,662 $ 22,917 Earnings/(loss) from operations before income tax $ 69,881 $ (8,287 ) $ 61,594 $ 60,347 $ (7,703 ) $ 52,644 Nine Months Ended Nine Months Ended September 30, 2019 September 30, 2018 Utility All Other Total Utility All Other Total Revenues $ 1,121,634 $ — $ 1,121,634 $ 1,099,331 $ — $ 1,099,331 Depreciation and amortization $ 179,939 $ — $ 179,939 $ 172,492 $ — $ 172,492 Interest expense $ 66,757 $ 24,636 $ 91,393 $ 47,461 $ 23,004 $ 70,465 Earnings/(loss) from operations before income tax $ 158,153 $ (24,697 ) $ 133,456 $ 144,416 $ (23,247 ) $ 121,169 Capital expenditures (1) $ 131,682 $ — $ 131,682 $ 170,299 $ — $ 170,299 As of September 30, 2019 As of December 31, 2018 Utility All Other Total Utility All Other Total Total assets $ 4,952,080 $ 16,228 $ 4,968,308 $ 4,851,712 $ 10,341 $ 4,862,053 (1) Capital expenditures includes payments for financed capital expenditures of $5.6 million and $8.5 million for the nine months ended September 30, 2019 and September 30, 2018, respectively.

Revenue (Notes)

Revenue (Notes)	9 Months Ended
	Sep. 30, 2019
Revenue from External Customer [Line Items]
Revenue from Contract with Customer [Text Block]	REVENUE Revenue is primarily earned from retail and wholesale electricity sales and electricity transmission and distribution delivery services. Revenue is recognized upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods or services. Revenue is recorded net of any taxes assessed on and collected from customers, which are remitted to the governmental authorities. Please see Note 13, “Revenue” to IPALCO’s 2018 Form 10-K for further discussion of our retail, wholesale and miscellaneous revenues. IPL’s revenue from contracts with customers was $391.5 million for the three months ended September 30, 2019 and $379.5 million for the three months ended September 30, 2018 , respectively, and $1,100.4 million for the nine months ended September 30, 2019 and $1,083.2 million for the nine months ended September 30, 2018 , respectively. The following table presents our revenue from contracts with customers and other revenue (in thousands): For the Three Months Ended For the Three Months Ended September 30, 2019 September 30, 2018 Retail Revenues Retail revenue from contracts with customers $ 369,945 $ 366,030 Other retail revenues (1) 6,478 4,293 Wholesale Revenues 18,426 10,844 Miscellaneous Revenues Transmission and other revenue from contracts with customers 3,091 2,631 Other miscellaneous revenues (2) 516 1,351 Total Revenues $ 398,456 $ 385,149 (1) Other retail revenue represents alternative revenue programs not accounted for under ASC 606 (2) Other miscellaneous revenue includes lease and other miscellaneous revenues not accounted for under ASC 606 For the Nine Months Ended For the Nine Months Ended September 30, 2019 September 30, 2018 Retail Revenues Retail revenue from contracts with customers $ 1,056,438 $ 1,045,286 Other retail revenues (1) 19,069 12,157 Wholesale Revenues 35,533 30,007 Miscellaneous Revenues Transmission and other revenue from contracts with customers 8,474 7,906 Other miscellaneous revenues (2) 2,120 3,975 Total Revenues $ 1,121,634 $ 1,099,331 (1) Other retail revenue represents alternative revenue programs not accounted for under ASC 606 (2) Other miscellaneous revenue includes lease and other miscellaneous revenues not accounted for under ASC 606 The balances of receivables from contracts with customers were $165.7 million and $160.8 million as of September 30, 2019 and December 31, 2018 , respectively. Payment terms for all receivables from contracts with customers typically do not extend beyond 30 days.

Leases (Notes)

Leases (Notes)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lessor, Leases [Policy Text Block]	LEASES LESSEE The Company enters into long-term non-cancelable lease arrangements which are classified as either operating or finance leases; however, lease balances were not material to the Financial Statements in the periods covered by this report. LESSOR The Company is the lessor under operating leases for land, office space and operating equipment. Minimum lease payments from such contracts are recognized as operating lease revenue on a straight-line basis over the lease term whereas contingent rentals are recognized when earned. Lease revenue included in the Unaudited Condensed Consolidated Statements of Operations was $0.2 million and $0.7 million for the three and nine months ended September 30, 2019 , respectively. Underlying gross assets and accumulated depreciation of operating leases included in Total net property, plant and equipment on the Condensed Consolidated Balance Sheet were $4.2 million and $0.7 million , respectively, as of September 30, 2019. The option to extend or terminate a lease is based on customary early termination provisions in the contract. The Company has not recognized any early terminations as of September 30, 2019. The following table shows the future minimum lease receipts as of September 30, 2019 for the remainder of 2019 through 2023 and thereafter (in thousands): Operating Leases 2019 $ 254 2020 941 2021 994 2022 906 2023 906 Thereafter 3,414 Total $ 7,415

Overview and Summary Of Signi_2

Overview and Summary Of Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Receivables, Policy [Policy Text Block]	Accounts Receivable The following table summarizes our accounts receivable balances at September 30, 2019 and December 31, 2018 : September 30, December 31, 2019 2018 (In Thousands) Accounts receivable, net Customer receivables $ 96,919 $ 91,426 Unbilled revenue 66,670 68,893 Amounts due from related parties 4,949 5,720 Other 7,165 4,341 Provision for uncollectible accounts (3,027 ) (2,821 ) Total accounts receivable, net $ 172,676 $ 167,559
Inventory, Policy [Policy Text Block]	Inventories The following table summarizes our inventories balances at September 30, 2019 and December 31, 2018 : September 30, December 31, 2019 2018 (In Thousands) Inventories Fuel $ 29,981 $ 32,457 Materials and supplies 61,999 67,211 Total inventories $ 91,980 $ 99,668
Derivatives, Policy [Policy Text Block]	Financial Derivatives All derivatives are recognized as either assets or liabilities in the balance sheets and are measured at fair value. Changes in the fair value are recorded in earnings unless the derivative is designated as a cash flow hedge of a forecasted transaction or it qualifies for the normal purchases and sales exception. We use interest rate hedges to manage the interest rate risk of our variable rate debt. We use cash flow hedge accounting when the hedge or a portion of the hedge is deemed to be highly effective, which results in changes in the fair value being recorded within accumulated other comprehensive income, a component of shareholders' equity. We have elected not to offset net derivative positions in the Financial Statements. Accordingly, we do not offset such derivative positions against the fair value of amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral under master netting agreements. See Note 3, “Derivative Instruments and Hedging Activities” for additional information.
Schedule of Asset Retirement Obligations [Table Text Block]	ARO During the nine months ended September 30, 2019 , IPL recorded adjustments to its ARO liabilities of $80.4 million primarily to reflect an increase to estimated ash pond closure costs, including groundwater remediation. The following is a roll forward of the ARO legal liability for the nine months ended September 30, 2019 (in thousands): Balance as of January 1, 2019 $ 129,451 Revisions to cash flow and timing estimates 80,406 Liabilities settled (8,373 ) Accretion expense 6,428 Balance as of September 30, 2019 $ 207,912
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The accompanying Financial Statements include the accounts of IPALCO, IPL and Mid-America Capital Resources, Inc., a non-regulated wholly-owned subsidiary of IPALCO. All significant intercompany amounts have been eliminated. The accompanying Financial Statements are unaudited; however, they have been prepared in accordance with GAAP for interim financial information and in conjunction with the rules and regulations of the SEC. Accordingly, they do not include all of the disclosures required by GAAP for annual fiscal reporting periods. In the opinion of management, all adjustments of a normal recurring nature necessary for fair presentation have been included. The electric utility business is affected by seasonal weather patterns throughout the year and, therefore, the operating revenues and associated operating expenses are not generated evenly by month during the year. These unaudited Financial Statements have been prepared in accordance with the accounting policies described in IPALCO’s 2018 Form 10-K and should be read in conjunction therewith.
Use Of Management Estimates	Use of Management Estimates The preparation of financial statements in conformity with GAAP requires that management make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The reported amounts of revenues and expenses during the reporting period may also be affected by the estimates and assumptions that management is required to make. Actual results may differ from those estimates.
Reclassifications	Reclassifications Certain immaterial amounts from prior periods have been reclassified to conform to the current year presentation.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash The following table provides a summary of cash, cash equivalents and restricted cash amounts as shown on the Condensed Consolidated Statements of Cash Flows: September 30, December 31, 2019 2018 (In Thousands) Cash, cash equivalents and restricted cash Cash and cash equivalents $ 48,413 $ 33,199 Restricted cash 400 400 Total cash, cash equivalents and restricted cash $ 48,813 $ 33,599
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Accumulated Other Comprehensive Income / (Loss) The changes in the components of Accumulated Other Comprehensive Income/(Loss) during the nine months ended September 30, 2019 are as follows: Gains and losses on cash flow hedges (In Thousands) Balance at January 1, 2019 $ — Other comprehensive loss (29,722 ) Balance at September 30, 2019 $ (29,722 )
New Accounting Pronouncements	New Accounting Pronouncements Adopted in 2019 The following table provides a brief description of recent accounting pronouncements that had an impact on the Company’s Financial Statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or did not have a material impact on the Company’s Financial Statements. New Accounting Standards Adopted ASU Number and Name Description Date of Adoption Effect on the Financial Statements upon adoption 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities The standard updates the hedge accounting model to expand the ability to hedge nonfinancial and financial risk components, reduce complexity, and ease certain documentation and assessment requirements. When facts and circumstances are the same as at the previous quantitative test, a subsequent quantitative effectiveness test is not required. The standard also eliminates the requirement to separately measure and report hedge ineffectiveness. For cash flow hedges, this means that the entire change in the fair value of a hedging instrument will be recorded in other comprehensive income and amounts deferred will be reclassified to earnings in the same income statement line as the hedged item. Transition method: modified retrospective with the cumulative effect adjustment recorded to the opening balance of retained earnings as of the initial application date. Prospective for presentation and disclosures. January 1, 2019 The adoption of this standard did not have a material impact on the Financial Statements. 2016-02, 2018-01, 2018-10, 2018-11, 2018-20, 2019-01, Leases (Topic 842) See discussion of the ASUs below. January 1, 2019 See impact upon adoption of the standard below. On January 1, 2019, the Company adopted ASC 842 Leases and its subsequent corresponding updates (“ASC 842”). Under this standard, lessees are required to recognize assets and liabilities for most leases on the balance sheet, and recognize expenses in a manner similar to the current accounting method. For lessors, the guidance modifies the lease classification criteria and the accounting for sales-type and direct financing leases. The guidance eliminates previous real estate-specific provisions. Under ASC 842, fewer of our contracts contain a lease. However, due to the elimination of the real estate-specific guidance and changes to certain lessor classification criteria, more leases qualify as sales-type leases and direct financing leases. Under these two models, a lessor derecognizes the asset and recognizes a lease receivable. According to ASC 842, the lease receivable includes the fair value of the asset after the contract period, but does not include variable payments such as margin on the sale of energy. Therefore, the lease receivable could be significantly different than the carrying amount of the underlying asset at lease commencement. In such circumstances, the difference between the initially recognized lease receivable and the carrying amount of the underlying asset is recognized as a gain/loss at lease commencement. During the course of adopting ASC 842, the Company applied various practical expedients including: • The package of practical expedients (applied to all leases) that allowed lessees and lessors not to reassess: a. whether any expired or existing contracts are or contain leases, b. lease classification for any expired or existing leases, and c. whether initial direct costs for any expired or existing leases qualify for capitalization under ASC 842. • The transition practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements, and • The transition practical expedient for lessees that allowed businesses to not separate lease and non-lease components. The Company applied the practical expedient to all classes of underlying assets when valuing right-of-use assets and lease liabilities. Contracts where the Company is the lessor were separated between the lease and non-lease components. The Company applied the modified retrospective method of adoption and elected to continue to apply the guidance in ASC 840 Leases to the comparative periods presented in the year of adoption. Under this transition method, the Company applied the transition provisions starting at the date of adoption. The adoption of ASC 842 did not have a material impact on our Financial Statements. New Accounting Pronouncements Issued But Not Yet Effective The following table provides a brief description of recent accounting pronouncements that could have a material impact on the Company’s Financial Statements once adopted. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on the Company’s Financial Statements. New Accounting Standards Issued But Not Yet Effective ASU Number and Name Description Date of Adoption Effect on the Financial Statements upon adoption 2016-13, 2018-19, 2019-04, 2019-05, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments See discussion of the ASU below. January 1, 2020. Early adoption is permitted only as of January 1, 2019. The Company will adopt the standard on January 1, 2020; see below for the evaluation of the impact of the adoption on the standard on the Financial Statements. ASU 2016-13 and its subsequent corresponding updates will update the impairment model for financial assets measured at amortized cost, known as the Current Expected Credit Loss ("CECL") model. For trade and other receivables, held-to-maturity debt securities, loans and other instruments, entities will be required to use a new forward-looking "expected loss" model that generally will result in the earlier recognition of allowance for losses. For available-for-sale debt securities with unrealized losses, entities will measure credit loses as it is done today, except that the losses will be recognized as an allowance rather than a reduction in the amortized cost of the securities. There are various transition methods available upon adoption. The Company is currently evaluating the impact of adopting the standard on its Financial Statements; however, it is expected that the new current expected credit loss model will primarily impact the calculation of the Company's expected credit losses on $175.7 million

Overview and Summary Of Signi_3

Overview and Summary Of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2019
Public Utilities, Inventory [Line Items]
Schedule of Inventory, Current [Table Text Block]	The following table summarizes our inventories balances at September 30, 2019 and December 31, 2018 : September 30, December 31, 2019 2018 (In Thousands) Inventories Fuel $ 29,981 $ 32,457 Materials and supplies 61,999 67,211 Total inventories $ 91,980 $ 99,668
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Accumulated Other Comprehensive Income / (Loss) The changes in the components of Accumulated Other Comprehensive Income/(Loss) during the nine months ended September 30, 2019 are as follows: Gains and losses on cash flow hedges (In Thousands) Balance at January 1, 2019 $ — Other comprehensive loss (29,722 ) Balance at September 30, 2019 $ (29,722 )
Schedule of Cash and Cash Equivalents [Table Text Block]	The following table provides a summary of cash, cash equivalents and restricted cash amounts as shown on the Condensed Consolidated Statements of Cash Flows: September 30, December 31, 2019 2018 (In Thousands) Cash, cash equivalents and restricted cash Cash and cash equivalents $ 48,413 $ 33,199 Restricted cash 400 400 Total cash, cash equivalents and restricted cash $ 48,813 $ 33,599

Overview and Summary Of Signi_4

Overview and Summary Of Significant Accounting Policies schedule of accounts and notes receivable (Tables)	9 Months Ended
	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The following table summarizes our accounts receivable balances at September 30, 2019 and December 31, 2018 : September 30, December 31, 2019 2018 (In Thousands) Accounts receivable, net Customer receivables $ 96,919 $ 91,426 Unbilled revenue 66,670 68,893 Amounts due from related parties 4,949 5,720 Other 7,165 4,341 Provision for uncollectible accounts (3,027 ) (2,821 ) Total accounts receivable, net $ 172,676 $ 167,559

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The fair value of assets and liabilities at September 30, 2019 and December 31, 2018 measured on a recurring basis and the respective category within the fair value hierarchy for IPALCO was determined as follows: Assets and Liabilities at Fair Value Level 1 Level 2 Level 3 Fair value at September 30, 2019 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 20 $ 20 $ — $ — Mutual funds 2,752 — 2,752 — Total VEBA investments 2,772 20 2,752 — Financial transmission rights 1,668 — — 1,668 Total financial assets measured at fair value $ 4,440 $ 20 $ 2,752 $ 1,668 Financial liabilities: Interest rate hedges $ 39,909 $ — $ 39,909 $ — Total financial liabilities measured at fair value $ 39,909 $ — $ 39,909 $ — Assets and Liabilities at Fair Value Level 1 Level 2 Level 3 Fair value at December 31, 2018 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 21 $ 21 $ — $ — Mutual funds 2,565 — 2,565 — Total VEBA investments 2,586 21 2,565 — Financial transmission rights 3,099 — — 3,099 Total financial assets measured at fair value $ 5,685 $ 21 $ 2,565 $ 3,099 Financial liabilities: Other derivative liabilities $ 53 $ — $ — $ 53 Total financial liabilities measured at fair value $ 53 $ — $ — $ 53
Schedule Of Face And Fair Value Of Debt	The following table shows the face value and the fair value of fixed-rate and variable-rate indebtedness (Level 2) for the periods ending: September 30, 2019 December 31, 2018 Face Value Fair Value Face Value Fair Value (In Thousands) Fixed-rate $ 2,523,800 $ 2,891,692 $ 2,523,800 $ 2,649,265 Variable-rate 155,000 155,000 155,000 155,000 Total indebtedness $ 2,678,800 $ 3,046,692 $ 2,678,800 $ 2,804,265

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities [Abstract]
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]	The following tables provide information on gains or losses recognized in AOCI for the cash flow hedges for the period indicated: Interest Rate Hedges for the Nine Months Ended September 30, 2019 $ in thousands (net of tax) Beginning accumulated derivative gain / (loss) in AOCI $ — Net losses associated with current period hedging transactions (29,722 ) Ending accumulated derivative loss in AOCI $ (29,722 ) Portion expected to be reclassified to earnings in the next twelve months $ — Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months) 10
Schedule of Derivative Instruments [Table Text Block]	At September 30, 2019 , IPL's outstanding derivative instruments were as follows: Commodity Accounting Treatment (a) Unit Purchases (in thousands) Sales (in thousands) Net Purchases/(Sales) (in thousands) Interest rate hedges Designated USD $ 400,000 $ — $ 400,000 FTRs Not Designated MWh 9,131 — 9,131 (a) Refers to whether the derivative instruments have been designated as a cash flow hedge.

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule Long-Term Indebtedness	The following table presents our long-term debt: September 30, December 31, Series Due 2019 2018 (In Thousands) IPL first mortgage bonds: 3.875% (1) August 2021 $ 55,000 $ 55,000 3.875% (1) August 2021 40,000 40,000 3.125% (1) December 2024 40,000 40,000 6.60% January 2034 100,000 100,000 6.05% October 2036 158,800 158,800 6.60% June 2037 165,000 165,000 4.875% November 2041 140,000 140,000 4.65% June 2043 170,000 170,000 4.50% June 2044 130,000 130,000 4.70% September 2045 260,000 260,000 4.05% May 2046 350,000 350,000 4.875% November 2048 105,000 105,000 Unamortized discount – net (6,189 ) (6,272 ) Deferred financing costs (16,769 ) (17,115 ) Total IPL first mortgage bonds 1,690,842 1,690,413 IPL unsecured debt: Variable (2) December 2020 30,000 30,000 Variable (2) December 2020 60,000 60,000 Deferred financing costs (143 ) (229 ) Total IPL unsecured debt 89,857 89,771 Total Long-term Debt – IPL 1,780,699 1,780,184 Long-term Debt – IPALCO: Term Loan July 2020 65,000 65,000 3.45% Senior Secured Notes July 2020 405,000 405,000 3.70% Senior Secured Notes September 2024 405,000 405,000 Unamortized discount – net (341 ) (424 ) Deferred financing costs (4,393 ) (5,696 ) Total Long-term Debt – IPALCO 870,266 868,880 Total Consolidated IPALCO Long-term Debt 2,650,965 2,649,064 Less: Current Portion of Long-term Debt 469,017 — Net Consolidated IPALCO Long-term Debt $ 2,181,948 $ 2,649,064 (1) First mortgage bonds issued to the Indiana Finance Authority to secure the loan of proceeds from tax-exempt bonds issued by the Indiana Finance Authority. (2) Unsecured notes issued to the Indiana Finance Authority by IPL to facilitate the loan of proceeds from various tax-exempt notes issued by the Indiana Finance Authority. The notes have a final maturity date of December 2038, but are subject to a mandatory put in December 2020.

Benefit Plans (Tables)

Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Retirement Benefits [Abstract]
Schedule Of Defined Benefit Plans Disclosures	The following table (in thousands) presents information for the nine months ended September 30, 2019 , relating to the Pension Plans: Net unfunded status of plans: Net unfunded status at December 31, 2018 $ (12,743 ) Net benefit cost components reflected in net unfunded status during first quarter: Service cost (1,853 ) Interest cost (6,836 ) Expected return on assets 7,477 Net unfunded status at March 31, 2019 $ (13,955 ) Net benefit cost components reflected in net unfunded status during second quarter: Service cost (1,852 ) Interest cost (6,836 ) Expected return on assets 7,477 Net unfunded status at June 30, 2019 $ (15,166 ) Net benefit cost components reflected in net unfunded status during third quarter: Service cost (1,853 ) Interest cost (6,836 ) Expected return on assets 7,477 Net unfunded status at September 30, 2019 $ (16,378 ) Regulatory assets related to pensions (1) : Regulatory assets at December 31, 2018 $ 201,452 Amount reclassified through net benefit cost: Amortization of prior service cost (956 ) Amortization of net actuarial loss (2,771 ) Regulatory assets at March 31, 2019 $ 197,725 Amount reclassified through net benefit cost: Amortization of prior service cost (957 ) Amortization of net actuarial loss (2,770 ) Regulatory assets at June 30, 2019 $ 193,998 Amount reclassified through net benefit cost: Amortization of prior service cost (956 ) Amortization of net actuarial loss (2,770 ) Regulatory assets at September 30, 2019 $ 190,272 (1) Amounts that would otherwise be charged/credited to Accumulated Other Comprehensive Income or Loss upon application of ASC 715, “Compensation – Retirement Benefits,” are recorded as a regulatory asset or liability because IPL has historically recovered and currently recovers pension and other postretirement benefit expenses in rates. These are unrecognized amounts not yet recognized as components of net periodic benefit costs.
Schedule Of Net Periodic Benefit Costs	The following table presents net periodic benefit cost information relating to the Pension Plans combined: For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 (In Thousands) (In Thousands) Components of net periodic benefit cost: Service cost $ 1,853 $ 2,112 $ 5,558 $ 6,338 Interest cost 6,836 6,305 20,508 18,915 Expected return on plan assets (7,477 ) (10,200 ) (22,431 ) (30,600 ) Amortization of prior service cost 956 959 2,869 2,878 Amortization of actuarial loss 2,770 2,851 8,311 8,552 Curtailments (1) — — — 1,230 Net periodic benefit cost $ 4,938 $ 2,027 $ 14,815 $ 7,313

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following table provides information about IPALCO’s business segments (in thousands): Three Months Ended Three Months Ended September 30, 2019 September 30, 2018 Utility All Other Total Utility All Other Total Revenues $ 398,456 $ — $ 398,456 $ 385,149 $ — $ 385,149 Depreciation and amortization $ 60,373 $ — $ 60,373 $ 57,880 $ — $ 57,880 Interest expense $ 22,244 $ 8,376 $ 30,620 $ 15,255 $ 7,662 $ 22,917 Earnings/(loss) from operations before income tax $ 69,881 $ (8,287 ) $ 61,594 $ 60,347 $ (7,703 ) $ 52,644 Nine Months Ended Nine Months Ended September 30, 2019 September 30, 2018 Utility All Other Total Utility All Other Total Revenues $ 1,121,634 $ — $ 1,121,634 $ 1,099,331 $ — $ 1,099,331 Depreciation and amortization $ 179,939 $ — $ 179,939 $ 172,492 $ — $ 172,492 Interest expense $ 66,757 $ 24,636 $ 91,393 $ 47,461 $ 23,004 $ 70,465 Earnings/(loss) from operations before income tax $ 158,153 $ (24,697 ) $ 133,456 $ 144,416 $ (23,247 ) $ 121,169 Capital expenditures (1) $ 131,682 $ — $ 131,682 $ 170,299 $ — $ 170,299 As of September 30, 2019 As of December 31, 2018 Utility All Other Total Utility All Other Total Total assets $ 4,952,080 $ 16,228 $ 4,968,308 $ 4,851,712 $ 10,341 $ 4,862,053

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table presents our revenue from contracts with customers and other revenue (in thousands): For the Three Months Ended For the Three Months Ended September 30, 2019 September 30, 2018 Retail Revenues Retail revenue from contracts with customers $ 369,945 $ 366,030 Other retail revenues (1) 6,478 4,293 Wholesale Revenues 18,426 10,844 Miscellaneous Revenues Transmission and other revenue from contracts with customers 3,091 2,631 Other miscellaneous revenues (2) 516 1,351 Total Revenues $ 398,456 $ 385,149 (1) Other retail revenue represents alternative revenue programs not accounted for under ASC 606 (2) Other miscellaneous revenue includes lease and other miscellaneous revenues not accounted for under ASC 606 For the Nine Months Ended For the Nine Months Ended September 30, 2019 September 30, 2018 Retail Revenues Retail revenue from contracts with customers $ 1,056,438 $ 1,045,286 Other retail revenues (1) 19,069 12,157 Wholesale Revenues 35,533 30,007 Miscellaneous Revenues Transmission and other revenue from contracts with customers 8,474 7,906 Other miscellaneous revenues (2) 2,120 3,975 Total Revenues $ 1,121,634 $ 1,099,331 (1) Other retail revenue represents alternative revenue programs not accounted for under ASC 606

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Operating Lease, Lease Income [Table Text Block]	The following table shows the future minimum lease receipts as of September 30, 2019 for the remainder of 2019 through 2023 and thereafter (in thousands): Operating Leases 2019 $ 254 2020 941 2021 994 2022 906 2023 906 Thereafter 3,414 Total $ 7,415

Overview and Summary of Signi_5

Overview and Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)generating_stationmiMW	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)generating_stationmiMW	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Accounts Receivable, Gross	$ 175,700		$ 175,700
Asset Retirement Obligation, Revision of Estimate			80,406
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,722)		(29,722)		$ 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(12,534)	$ 0	(29,722)	$ 0
Inventories	29,981		29,981		32,457
Cash and cash equivalents	$ 48,413		$ 48,413		33,199
Number of customers	500,000		500,000
Distance of furthest customer from Indianapolis | mi	40		40
Number of generating stations | generating_station	4		4
Restricted Cash and Cash Equivalents	$ 400		$ 400		400
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	48,813	$ 15,745	48,813	$ 15,745	33,599	$ 30,681
Regulatory assets, current	61,999		61,999		67,211
Inventory, Net	$ 91,980		$ 91,980		$ 99,668
Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Electric generation capability for winter, megawatts | MW	3,705		3,705
Electric generation capability for summer, megawatts | MW	3,560		3,560
Aes U.S. Investments [Member]
Debt Instrument [Line Items]
Ownership percentage by parent (percent)	82.35%		82.35%
CDPQ [Member]
Debt Instrument [Line Items]
Ownership percentage by parent (percent)	17.65%		17.65%
Ownership interest in parent company (percent)	15.00%		15.00%
AES U.S. Holdings, LLC [Member]
Debt Instrument [Line Items]
Ownership interest in parent company (percent)	85.00%		85.00%
Harding Street [Member]
Debt Instrument [Line Items]
Amount of New Operation for Battery Storage Unit, megawatts | MW	20		20
Interest Rate Contract [Member]
Debt Instrument [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			$ (29,722)

Overview and Summary Of Signi_6

Overview and Summary Of Significant Accounting Policies Schedule of Changes in Asset Retirement Obligation (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	$ 207,912	$ 129,451
Asset Retirement Obligation, Revision of Estimate	80,406
Asset Retirement Obligation, Liabilities Settled	(8,373)
Asset Retirement Obligation, Accretion Expense	$ 6,428

Overview and Summary Of Signi_7

Overview and Summary Of Significant Accounting Policies Schedule of cash, restricted cash and cash equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 48,413	$ 33,199
Restricted Cash and Cash Equivalents	400	400
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 48,813	$ 33,599	$ 15,745	$ 30,681

Overview and Summary Of Signi_8

Overview and Summary Of Significant Accounting Policies Schedule of Accounts and notes receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from Customers	$ 96,919	$ 91,426
Unbilled Receivables, Current	66,670	68,893
Accounts Receivable, Related Parties	4,949	5,720
Other Receivables	7,165	4,341
Allowance for Doubtful Accounts Receivable	(3,027)	(2,821)
Accounts Receivable, Net, Current	$ 172,676	$ 167,559

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	$ 2,772	$ 2,586
Asset Retirement Obligation, Revision of Estimate	80,406
Asset retirement obligations	207,912	129,451
Unamortized deferred financing costs	21,300	23,000
Unamortized debt discount	6,500	6,700
Financial Transmission Rights Fair Value Disclosure	1,668	3,099
Assets, Fair Value Disclosure	4,440	5,685
Derivative Liability		53
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39,909	53
Money Market Funds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	20	21
Mutual Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	2,752	2,565
Fair Value, Inputs, Level 3 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Transmission Rights Fair Value Disclosure	1,668	3,099
Assets, Fair Value Disclosure	1,668	3,099
Derivative Liability		53
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	53
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Mutual Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	2,752	2,565
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	2,752	2,565
Derivative Liability		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39,909	0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	2,752	2,565
Fair Value, Inputs, Level 1 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	20	21
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	20	21
Derivative Liability		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	20	21
Fair Value, Inputs, Level 1 [Member] | Mutual Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	$ 0	$ 0

Fair Value SUmmary of fair valu

Fair Value SUmmary of fair value Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 2,772	$ 2,586
Financial Transmission Rights Fair Value Disclosure	1,668	3,099
Assets, Fair Value Disclosure	4,440	5,685
Interest Rate Cash Flow Hedge Liability at Fair Value	39,909	0
Derivative Liability		53
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39,909	53
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	20	21
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	20	21
Interest Rate Cash Flow Hedge Liability at Fair Value	0
Derivative Liability		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,752	2,565
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	2,752	2,565
Interest Rate Cash Flow Hedge Liability at Fair Value	39,909
Derivative Liability		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39,909	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Transmission Rights Fair Value Disclosure	1,668	3,099
Assets, Fair Value Disclosure	1,668	3,099
Interest Rate Cash Flow Hedge Liability at Fair Value	0
Derivative Liability		53
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	53
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	20	21
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	20	21
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,752	2,565
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,752	2,565
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 0	$ 0

Fair Value (Schedule Of Face An

Fair Value (Schedule Of Face And Fair Value Of Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 6,500	$ 6,700
Face Value	2,678,800	2,678,800
Fair Value	3,046,692	2,804,265
Fixed Rate [Member]
Debt Instrument [Line Items]
Face Value	2,523,800	2,523,800
Fair Value	2,891,692	2,649,265
Variable Rate [Member]
Debt Instrument [Line Items]
Face Value	155,000	155,000
Fair Value	$ 155,000	$ 155,000

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Regulatory Matters [Line Items]
Total current regulatory assets	$ 32,027	$ 28,399
Total long-term regulatory assets	372,433	395,077
Total current regulatory liabilities	54,827	51,024
Total long-term regulatory liabilities	$ 864,442	$ 870,255

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) MWh in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)MWh	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)MWh	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Number of Interest Rate Swaps	3		3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$ (12,534,000)	$ 0	$ (29,722,000)	$ 0
FTR [Member] | Not Designated as Hedging Instrument [Member]
Purchase of Units Derivative Instruments Financial Transmission Rights | MWh	9,131		9,131
Sale of Units Derivative Instruments Financial Transmission Rights | MWh	0		0
Derivative, Nonmonetary Notional Amount, Purchase (Sales), Net | MWh	9,131		9,131
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Purchase of Derivative Instruments Interest Rate Swap	$ 400,000,000		$ 400,000,000
Sale of Derivative Instruments Interest Rate Swap	0		0
Derivative, Notional Amount, Purchase (Sales), Net	400,000,000		400,000,000
Derivative, Notional Amount	400,000,000		400,000,000
Interest Rate Contract [Member]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(29,722,000)		(29,722,000)		$ 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			(29,722,000)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 0		$ 0
Maximum Length of Time Hedged in Cash Flow Hedge			10 months

Debt (Schedule Long-Term Indebt

Debt (Schedule Long-Term Indebtedness) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized discount - net	$ (6,500)	$ (6,700)
Deferred financing costs	(21,300)	(23,000)
Long-term debt	2,650,965	2,649,064
Less: Current Portion of Long-term Debt	469,017	0
Net Consolidated IPALCO Long-term Debt	2,181,948	2,649,064
Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
First mortgage bonds	1,690,842	1,690,413
Unamortized discount - net	(6,189)	(6,272)
Long-term debt	1,780,699	1,780,184
Unsecured Debt	$ 89,857	89,771
Indianapolis Power And Light Company [Member] | First Mortgage Bond 3.875% Due August 2021 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	3.875%
Debt due date	Aug. 1, 2021
First mortgage bonds	$ 55,000	55,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 3.875% Due August 2021 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	3.875%
Debt due date	Aug. 1, 2021
First mortgage bonds	$ 40,000	40,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.55% Due December 2024 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	3.125%
Debt due date	Dec. 1, 2024
First mortgage bonds	$ 40,000	40,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due January 2034 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	6.60%
Debt due date	Jan. 1, 2034
First mortgage bonds	$ 100,000	100,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.05% Due October 2036 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	6.05%
Debt due date	Oct. 1, 2036
First mortgage bonds	$ 158,800	158,800
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due June 2037 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	6.60%
Debt due date	Jun. 1, 2037
First mortgage bonds	$ 165,000	165,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.875% Due November 2041 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.875%
Debt due date	Nov. 1, 2041
First mortgage bonds	$ 140,000	140,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.65% Due June 2043 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.65%
Debt due date	Jun. 1, 2043
First mortgage bonds	$ 170,000	170,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.50% Due June 2044[Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.50%
Debt due date	Jun. 1, 2044
First mortgage bonds	$ 130,000	130,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.70%, Due September 2045 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.70%
Debt due date	Sep. 1, 2045
First mortgage bonds	$ 260,000	260,000
Indianapolis Power And Light Company [Member] | FMB Twenty [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.05%
Debt due date	May 1, 2046
First mortgage bonds	$ 350,000	350,000
Indianapolis Power And Light Company [Member] | FMB Twenty - one [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.875%
Debt due date	Nov. 1, 2048
First mortgage bonds	$ 105,000	105,000
Indianapolis Power And Light Company [Member] | Environmental Facilities Refunding Revenue Notes, Series 2015A [Member]
Debt Instrument [Line Items]
Debt due date	Dec. 22, 2020
Unsecured Debt	$ 30,000	30,000
Indianapolis Power And Light Company [Member] | Environmental Facilities Refunding Revenue Notes, Series 2015B [Member]
Debt Instrument [Line Items]
Debt due date	Dec. 22, 2020
Unsecured Debt	$ 60,000	60,000
Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Unamortized discount - net	(341)	(424)
Deferred financing costs	(4,393)	(5,696)
Net Consolidated IPALCO Long-term Debt	$ 870,266	868,880
Ipalco Enterprises, Inc. [Member] | Bank Term Loan Maturing July 2020 [Member]
Debt Instrument [Line Items]
Debt due date	Jul. 1, 2020
Long-term debt	$ 65,000	65,000
Ipalco Enterprises, Inc. [Member] | 3.45% Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	3.45%
Debt due date	Jul. 1, 2020
Long-term debt	$ 405,000	405,000
Ipalco Enterprises, Inc. [Member] | Three Point Seven Zero Percent Senior Secured Notes [Domain]
Debt Instrument [Line Items]
Debt, stated interest rate	3.70%
Debt due date	Sep. 1, 2024
Long-term debt	$ 405,000	405,000
First Mortgage Bonds [Member] | Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Deferred financing costs	(16,769)	(17,115)
Unsecured Debt [Member] | Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Deferred financing costs	$ (143)	$ (229)

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 2,650,965	$ 2,649,064
Line of credit facility, term	5 years
Maximum borrowing capacity	$ 250,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, accordion feature	150,000
Parent Company [Member] | Three Point Four Five Percent Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 405,000	405,000
Debt Instrument, Interest Rate, Stated Percentage	3.45%
Debt instrument, maturity date	Jul. 1, 2020
Parent Company [Member] | Bank Term Loan Maturing July 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 65,000	65,000
Debt instrument, maturity date	Jul. 1, 2020
Parent Company [Member] | Three Point Seven Zero Percent Senior Secured Notes [Domain]
Debt Instrument [Line Items]
Long-term Debt	$ 405,000	$ 405,000
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Debt instrument, maturity date	Sep. 1, 2024

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
State and federal income tax rate	21.20%	20.40%	21.20%	19.80%

Benefit Plans (Narrative) (Deta

Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Postretirement Health Care Benefits [Member] | Subsidiaries [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded obligation	$ 7.1	$ 6.7

Benefit Plans (Schedule Of Defi

Benefit Plans (Schedule Of Defined Benefit Plans Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Unfunded Status of Plans [Roll Forward]
Net funded status before tax adjustments	$ (15,166)	$ (13,955)	$ (12,743)		$ (12,743)
Service cost	(1,853)	(1,852)	(1,853)	$ (2,112)	(5,558)	$ (6,338)
Interest cost	(6,836)	(6,836)	(6,836)	(6,305)	(20,508)	(18,915)
Expected return on assets	7,477	7,477	7,477	10,200	22,431	30,600
Net funded status before tax adjustments	(16,378)	(15,166)	(13,955)		(16,378)
Regulatory Assets Related to Pensions [Roll Forward]
Amortization of prior service cost	(956)			(959)	(2,869)	(2,878)
Defined Benefit Plan, Amortization of Gain (Loss)	(2,770)			(2,851)	(8,311)	(8,552)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0			$ 0	0	$ 1,230
Pension Plan [Member]
Regulatory Assets Related to Pensions [Roll Forward]
Regulatory assets before tax adjustments	193,998	197,725	201,452		201,452
Amortization of prior service cost	(956)	(957)	(956)
Regulatory assets before tax adjustments	190,272	193,998	197,725		$ 190,272
Defined Benefit Plan, Amortization of Gain (Loss)	$ (2,770)	$ (2,770)	$ (2,771)

Benefit Plans (Schedule Of Net

Benefit Plans (Schedule Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Retirement Benefits [Abstract]
Service cost	$ 1,853	$ 1,852	$ 1,853	$ 2,112	$ 5,558	$ 6,338
Interest cost	6,836	6,836	6,836	6,305	20,508	18,915
Expected return on assets	(7,477)	$ (7,477)	$ (7,477)	(10,200)	(22,431)	(30,600)
Amortization of prior service cost	956			959	2,869	2,878
Amortization of actuarial loss	2,770			2,851	8,311	8,552
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0			0	0	1,230
Net periodic benefit cost	$ 4,938			$ 2,027	$ 14,815	$ 7,313

Commitments and Contingencies (

Commitments and Contingencies (Details)	1 Months Ended
	Oct. 31, 2009coal_fired_electric_generating_facility
Indianapolis Power And Light Company [Member]
Entity Information [Line Items]
Number of facilities with violations of Federal Clean Air Act	3

Business Segment Information (D

Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Financed Capital Expenditures			$ 5,600	$ 8,500
Income Tax Expense (Benefit)	$ 13,088	$ 10,572	28,252	23,548
Net Income (Loss) Attributable to Parent	48,506	42,072	105,204	97,621
UTILITY OPERATING REVENUES	398,456	385,149	1,121,634	1,099,331
Depreciation and amortization	60,373	57,880	179,939	172,492
Interest Expense	30,620	22,917	91,393	70,465
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	61,594	52,644	133,456	121,169
Property, Plant and Equipment, Additions			131,682	170,299
Assets	4,968,308		4,968,308		$ 4,862,053
Cash	11,800		11,800		6,400
Other Long-term Investments	2,700		2,700		4,000
Interest Rate Cash Flow Hedge Liability at Fair Value	39,909		$ 39,909		0
Nonutility assets representation rate, percentage			1.00%
Electric [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	60,373	57,880	$ 179,939	172,492
Interest Expense	22,244	15,255	66,757	47,461
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	69,881	60,347	158,153	144,416
Property, Plant and Equipment, Additions			131,682	170,299
Assets	4,952,080		4,952,080		4,851,712
Other Segments [Member]
Segment Reporting Information [Line Items]
UTILITY OPERATING REVENUES	0	0	0	0
Depreciation and amortization	0	0	0	0
Interest Expense	8,376	7,662	24,636	23,004
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(8,287)	(7,703)	(24,697)	(23,247)
Property, Plant and Equipment, Additions			0	0
Assets	16,228		16,228		$ 10,341
Electricity [Member]
Segment Reporting Information [Line Items]
UTILITY OPERATING REVENUES	$ 398,456	$ 385,149	$ 1,121,634	$ 1,099,331

Revenue (Details)

Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Gross	$ 165,700		$ 165,700		$ 160,800
Revenue from Contract with Customer, Excluding Assessed Tax	391,500	$ 379,500	1,100,400	$ 1,083,200
REVENUES	398,456	385,149	1,121,634	1,099,331
Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	369,945	366,030	1,056,438	1,045,286
Other non-606 revenue	6,478	4,293	19,069	12,157
Wholesale Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	18,426	10,844	35,533	30,007
Miscellaneous revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,091	2,631	8,474	7,906
Other non-606 revenue	516	1,351	2,120	3,975
Electricity [Member]
Disaggregation of Revenue [Line Items]
REVENUES	$ 398,456	$ 385,149	$ 1,121,634	$ 1,099,331

Leases (Details)

Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating Lease, Lease Income	$ 200	$ 700
Lessor, Operating Lease, Payments to be Received, Next Twelve Months	254	254
Lessor, Operating Lease, Payments to be Received, Two Years	941	941
Lessor, Operating Lease, Payments to be Received, Three Years	994	994
Lessor, Operating Lease, Payments to be Received, Four Years	906	906
Lessor, Operating Lease, Payments to be Received, Five Years	906	906
Lessor, Operating Lease, Payments to be Received, Thereafter	3,414	3,414
Lessor, Operating Lease, Payments to be Received	7,415	7,415
Lessor, Operating Lease, Assumptions and Judgments, Value of Underlying Asset, Amount	4,200	4,200
Property Subject to or Available for Operating Lease, Accumulated Depreciation	$ 700	$ 700