Ipalco Enterprises 10-Q 4 Aug 21 2021 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2021	Aug. 04, 2021
Entity Information [Line Items]
Document Fiscal Year Focus	2021
Entity Central Index Key	0000728391
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Incorporation, State or Country Code	IN
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Amendment Flag	false
Document Fiscal Period Focus	Q2
Entity Registrant Name	IPALCO ENTERPRISES, INC.
Entity Tax Identification Number	35-1575582
Entity Address, Postal Zip Code	46204
Entity File Number	1-8644
Entity Address, Address Line One	One Monument Circle
Entity Address, City or Town	Indianapolis
Entity Address, State or Province	IN
City Area Code	317
Local Phone Number	261-8261
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Stock, Shares, Outstanding		108,907,318
AES U.S. Investments [Member]
Entity Information [Line Items]
Common Stock, Shares, Outstanding		89,685,177
CDPQ [Member]
Entity Information [Line Items]
Common Stock, Shares, Outstanding		19,222,141

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Costs and Expenses	$ 282,708	$ 253,797	$ 572,011	$ 536,407
REVENUES	330,587	311,503	692,788	668,885
Cost of Revenue [Abstract]
Fuel Costs	52,840	43,351	137,571	112,139
Cost of Goods and Services Sold	41,748	43,082	66,331	78,549
OPERATING EXPENSES:
Utilities Operating Expense, Maintenance and Operations	116,381	94,659	220,330	200,248
Depreciation and amortization	62,994	61,099	126,083	121,807
Taxes other than income taxes	8,745	11,606	21,696	23,664
Operating Income (Loss)	47,879	57,706	120,777	132,478
Allowance for equity funds used during construction	1,331	1,160	2,705	2,017
Interest Expense	32,199	33,935	62,266	64,016
Other Nonoperating Income (Expense)	4,704	1,772	9,318	1,979
Nonoperating Income (Expense)	(26,164)	(33,418)	(50,243)	(62,435)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	21,715	24,288	70,534	70,043
Income Tax Expense (Benefit)	4,505	5,165	14,540	14,937
Net income	17,210	19,123	55,994	55,106
Less: Dividends on preferred stock	804	804	1,607	1,607
Net Income (Loss) Available to Common Stockholders, Basic	16,406	18,319	54,387	53,499
Gain (Loss) on Extinguishment of Debt	0	(2,415)	0	(2,415)
OPERATING INCOME	47,879	57,706	120,777	132,478
OTHER INCOME / (EXPENSE), NET:
Allowance for equity funds used during construction	1,331	1,160	2,705	2,017
Interest Expense	(32,199)	(33,935)	(62,266)	(64,016)
Other Nonoperating Income (Expense)	4,704	1,772	9,318	1,979
Total other expense, net	(26,164)	(33,418)	(50,243)	(62,435)
EARNINGS FROM OPERATIONS BEFORE INCOME TAX
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	21,715	24,288	70,534	70,043
Income Tax Expense (Benefit)	4,505	5,165	14,540	14,937
NET INCOME	17,210	19,123	55,994	55,106
Less: Dividends on preferred stock	804	804	1,607	1,607
NET INCOME APPLICABLE TO COMMON STOCK	16,406	18,319	54,387	53,499
Electricity [Member]
REVENUES	$ 330,587	$ 311,503	$ 692,788	$ 668,885

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ 5,361	$ 1,388	$ (4,294)	$ 13,910
Net Income (Loss) Available to Common Stockholders, Basic	16,406	18,319	54,387	53,499
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(17,143)	(4,026)	12,907	(40,339)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(15,767)	(2,682)	13,827	(38,995)
Other Comprehensive Income (Loss), Net of Tax	(15,767)	(2,682)	13,827	(38,995)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	639	15,637	68,214	14,504
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	1,376	1,344	920	1,344
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ 431	$ 463	$ 284	$ 463

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 20,629	$ 20,502
Restricted Cash and Cash Equivalents	5	6,120
Accounts Receivable, after Allowance for Credit Loss, Current	158,962	165,193
Inventory, Net	81,460	95,506
Regulatory assets	62,188	45,430
Income Taxes Receivable, Current	20,709	24,384
Other Assets, Current	30,369	17,842
Total current assets	374,322	374,977
UTILITY PLANT:
Property, Plant and Equipment, Gross	6,479,619	6,530,395
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	2,594,590	2,643,695
Utility plant in service - net	3,885,029	3,886,700
Construction in Progress, Gross	246,871	209,584
Total net property, plant and equipment	4,131,900	4,096,284
OTHER ASSETS:
Intangible Assets, Net (Excluding Goodwill)	56,765	59,141
Regulatory assets	372,339	392,801
Other assets - net	58,879	46,716
Assets, Noncurrent	487,983	498,658
TOTAL ASSETS	4,994,205	4,969,919
Debt, Current	100,000	169,907
CURRENT LIABILITIES:
Accounts payable	151,511	127,089
Accrued taxes	26,404	26,620
Interest Payable, Current	31,785	31,733
Customer deposits	27,747	27,929
Regulatory Liability, Current	12,503	30,036
Accrued Liabilities and Other Liabilities	15,606	19,453
Total current liabilities	365,556	432,767
NON-CURRENT LIABILITIES:
Long-term debt (Note 4)	2,652,396	2,556,278
Deferred income tax liabilities	291,517	275,714
Taxes Payable	7,552	7,458
Regulatory Liability, Noncurrent	830,788	839,360
Accrued pension and other postretirement benefits	5,426	5,334
Asset retirement obligations	194,926	195,236
Other non-current liabilities	13,565	13,785
Total non-current liabilities	4,042,185	3,956,380
Liabilities	4,407,741	4,389,147
Common shareholders' equity:
Additional Paid in Capital	580,831	588,966
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,593)	(43,420)
Accumulated deficit	(24,558)	(24,558)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	526,680	520,988
Cumulative preferred stock of subsidiary	59,784	59,784
Total common shareholders' equity	586,464	580,772
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,994,205	4,969,919
Derivative Liability, Noncurrent	46,015	63,215
Accounts Receivable, Allowance for Credit Loss, Current	1,553	3,155
Accounts receivable and unbilled revenue, allowance for doubtful accounts	$ 1,553	$ 3,155

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATIONS:
Net income	$ 17,210		$ 19,123		$ 55,994	$ 55,106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,994		61,099		126,083	121,807
Amortization of redemption premiums and expense on debt					1,977	2,087
Deferred income taxes and investment tax credit adjustments - net					5,866	860
Allowance for equity funds used during construction					(2,705)	(2,017)
Gain (Loss) on Extinguishment of Debt	0		2,415		0	2,415	$ 2,400
Change in certain assets and liabilities:
Accounts receivable					6,231	(2,589)
Inventories					9,900	(23,346)
Increase (Decrease) in Accounts Payable					22,316	(16,396)
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities					(3,934)	(3,996)
Accrued real estate and personal property taxes					3,553	21,144
Accrued interest					52	(1,951)
Pension and other postretirement benefit assets and liabilities					(8,284)	(3,452)
Short-term and long-term regulatory assets and liabilities					(21,026)	(799)
Increase (Decrease) in Prepaid Expense and Other Assets					12,526	3,169
Other - net					(4,398)	619
Net cash provided by operating activities					179,099	146,323
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures					(132,305)	(92,848)
Project development costs					(624)	(1,206)
Cost of removal and regulatory recoverable ARO payments					(12,562)	(19,488)
Other					0	101
Net cash used in investing activities					(145,491)	(113,441)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments for financed capital expenditures					36	0
Proceeds from Issuance of Long-term Debt					0	474,568
Repayments of Lines of Credit					(75,000)	0
Distributions to Shareholders					62,579	53,227
Repayments of Long-term Debt					0	472,135
Payments of Deferred Finance Costs					(280)	(5,664)
Proceeds from Lines of Credit					100,000	30,000
Repayments of Long-term Debt					0	(472,135)
Preferred dividends of subsidiary	(804)	$ (803)	(804)	$ (803)	(1,607)	(1,607)
Other					(94)	(118)
Net cash used in financing activities					(39,596)	(28,183)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect					(5,988)	4,699
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	20,634		53,251		20,634	53,251	26,622	$ 48,552
Supplemental disclosures of cash flow information:
Capital Expenditures Incurred but Not yet Paid					56,465	35,617
Cash paid during the period for:
Income Taxes Paid, Net					5,000	12,000
Interest (net of amount capitalized)					59,195	62,167
Net income	17,210		19,123		55,994	55,106
Depreciation and amortization	62,994		61,099		126,083	121,807
Amortization of redemption premiums and expense on debt					1,977	2,087
Deferred income taxes and investment tax credit adjustments - net					5,866	860
Increase (Decrease) in Allowance for Equity Funds Used During Construction					2,705	2,017
Gain (Loss) on Extinguishment of Debt	$ 0		$ (2,415)		0	(2,415)	$ (2,400)
Increase (Decrease) in Regulatory Assets and Liabilities					21,026	799
Increase (Decrease) in Prepaid Expense and Other Assets					12,526	3,169
Other - net					(4,398)	619
Net Cash Provided by (Used in) Operating Activities					179,099	146,323
Increase (Decrease) in Accounts Receivable					(6,231)	2,589
Increase (Decrease) in Inventories					(9,900)	23,346
Increase (Decrease) in Accounts Payable					22,316	(16,396)
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities					(3,934)	(3,996)
Increase (Decrease) in Property and Other Taxes Payable					3,553	21,144
Accrued interest					52	(1,951)
Pension and other postretirement benefit assets and liabilities					$ (8,284)	$ (3,452)

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	$ 546,476	$ 590,784		$ (24,558)	$ 59,784
Other Comprehensive Income (Loss), Net of Tax	(36,313)
Net Income (Loss) Available to Common Stockholders, Basic	35,180
Dividends, Common Stock	(26,631)
Stock Issued During Period, Value, Other	49	49
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1,133)
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(26,631)
Other Comprehensive Income (Loss), Net of Tax	(38,995)
Net Income (Loss) Available to Common Stockholders, Basic	53,499
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	14,504
Preferred Stock Dividends, Income Statement Impact	1,607
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(1,607)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	518,761	590,833	$ (56,063)	(16,009)	59,784
Other Comprehensive Income (Loss), Net of Tax	(2,682)
Net Income (Loss) Available to Common Stockholders, Basic	18,319
Dividends, Common Stock	(26,596)
Stock Issued During Period, Value, Other	37	37
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	15,637
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Payments of Ordinary Dividends, Common Stock	(26,596)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	507,839	590,870	(58,745)	(24,286)	59,784
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	520,988	588,966		(24,558)	59,784
Other Comprehensive Income (Loss), Net of Tax	29,594
Net Income (Loss) Available to Common Stockholders, Basic	37,981
Dividends, Common Stock	(30,073)
Stock Issued During Period, Value, Other	41	41
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	67,575
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(30,073)
Other Comprehensive Income (Loss), Net of Tax	13,827
Net Income (Loss) Available to Common Stockholders, Basic	54,387
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	68,214
Preferred Stock Dividends, Income Statement Impact	1,607
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(1,607)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	558,531	589,007	(13,826)	(16,650)	59,784
Other Comprehensive Income (Loss), Net of Tax	(15,767)
Net Income (Loss) Available to Common Stockholders, Basic	16,406
Dividends, Common Stock	(32,506)
Stock Issued During Period, Value, Other	16	16
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	639
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Return of Capital		(8,192)
Payments of Ordinary Dividends, Common Stock	(24,314)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 526,680	$ 580,831	$ (29,593)	$ (24,558)	$ 59,784

Overview and Summary Of Signifi

Overview and Summary Of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Overview and Summary Of Significant Accounting Policies	1. 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, which does business as AES Indiana. Substantially all of IPALCO’s business consists of generating, transmitting, distributing and selling of electric energy conducted through its principal subsidiary, AES Indiana. AES Indiana was incorporated under the laws of the state of Indiana in 1926. AES Indiana has approximately 514,000 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. AES Indiana has an exclusive right to provide electric service to those customers. AES Indiana owns and operates four generating stations, all within the state of Indiana. AES Indiana’s largest generating station, Petersburg, is coal-fired, and AES Indiana retired 230 MW Petersburg Unit 1 on May 31, 2021 and has plans to retire 415 MW Petersburg Unit 2 in 2023 (for further discussion, see Note 2, " Regulatory Matters - IRP Filing and Replacement Generation" ). The second largest station, Harding Street, uses natural gas and fuel oil to power combustion turbines. In addition, AES Indiana 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. The fourth station, Georgetown, is a small peaking station that uses natural gas to power combustion turbines. As of June 30, 2021, AES Indiana’s net electric generation capacity for winter is 3,475 MW and net summer capacity is 3,330 MW. Consolidation The accompanying Financial Statements include the accounts of IPALCO, AES Indiana and Mid-America Capital Resources, Inc., a non-regulated wholly-owned subsidiary of IPALCO. All significant intercompany amounts have been eliminated in consolidation. Interim Financial Presentation The accompanying Financial Statements are unaudited; however, they have been prepared in accordance with GAAP, as contained in the FASB ASC, for interim financial information and Article 10 of Regulation S-X issued by the SEC. Accordingly, they do not include all the information and footnotes required by GAAP for annual fiscal reporting periods. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of the results of operations, financial position, comprehensive income, changes in equity, and cash flows. 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 2020 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. Cash, Cash Equivalents and Restricted Cash The following table provides a summary of cash, cash equivalents and restricted cash amounts as shown on the Unaudited Condensed Consolidated Statements of Cash Flows: June 30, December 31, 2021 2020 (In Thousands) Cash, cash equivalents and restricted cash Cash and cash equivalents $ 20,629 $ 20,502 Restricted cash 5 6,120 Total cash, cash equivalents and restricted cash $ 20,634 $ 26,622 Accounts Receivable The following table summarizes our accounts receivable balances at June 30, 2021 and December 31, 2020: June 30, December 31, 2021 2020 (In Thousands) Accounts receivable, net Customer receivables $ 84,477 $ 91,335 Unbilled revenue 66,530 72,334 Amounts due from related parties — 490 Other 9,508 4,189 Allowance for credit losses (1,553) (3,155) Total accounts receivable, net $ 158,962 $ 165,193 The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the periods indicated (in Thousands): Six Months Ended June 30, 2021 Beginning Allowance Balance at January 1, 2021 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 3,155 $ 1,030 $ (3,741) $ 1,109 $ 1,553 Six Months Ended June 30, 2020 Beginning Allowance Balance at January 1, 2020 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 921 $ 4,312 $ (3,697) $ 2,517 $ 4,053 The allowance for credit losses primarily relates to utility customer receivables, including unbilled amounts. Expected credit loss estimates are developed by disaggregating customers into those with similar credit risk characteristics and using historical credit loss experience. In addition, we also consider how current and future economic conditions are expected to impact collectability, as applicable, including the economic impacts of the COVID-19 pandemic on our receivable balance as of June 30, 2021. Amounts are written off when reasonable collections efforts have been exhausted. During 2021, the current period provision and allowance for credit losses have decreased due to lower past due customer receivable balances. Inventories The following table summarizes our inventories balances at June 30, 2021 and December 31, 2020: June 30, December 31, 2021 2020 (In Thousands) Inventories Fuel $ 21,328 $ 36,953 Materials and supplies, net 60,132 58,553 Total inventories $ 81,460 $ 95,506 AOCL The amounts reclassified out of AOCL by component during the three and six months ended June 30, 2021 and 2020 are as follows (in thousands): Details about AOCL components Affected line item in the Condensed Consolidated Statements of Operations Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Gains and losses on cash flow hedges (Note 4): Interest expense $ 1,807 $ 1,807 $ 1,204 $ 1,807 Income tax expense (431) (463) (284) (463) Total reclassifications for the period, net of income taxes $ 1,376 $ 1,344 $ 920 $ 1,344 See Note 4, " Derivative Instruments and Hedging Activities - Cash Flow Hedges " for further information on the changes in the components of AOCL. 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 2020-04, Reference Rate Form (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting The amendments in these updates provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference to LIBOR or another reference rate expected to be discontinued by reference rate reform, and clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. These amendments are effective for a limited period of time (March 12, 2020 - December 21, 2022). March 12, 2020 - December 31, 2022 The Company is currently evaluating the impact of adopting the standard on the Financial Statements.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2021
Regulated Operations [Abstract]
Regulatory Matters	2. REGULATORY MATTERS IRP Filing and Replacement Generation On February 5, 2021, AES Indiana announced an agreement to acquire a 195 MW solar project to be developed in Clinton County, Indiana and expected to be completed in 2023. On February 12, 2021, AES Indiana filed a petition and case-in-chief with the IURC seeking a CPCN for this solar project and on June 16, 2021, AES Indiana received an order from the IURC approving the project. On August 2, 2021, AES Indiana announced plans to acquire a 250 MW solar and 180 MWh energy storage facility to be developed in Pike County, Indiana and expected to be completed in 2024. The plans require approval from the IURC. On July 30, 2021, AES Indiana filed a petition and case-in-chief with the IURC seeking a CPCN for this solar project. On February 26, 2021, as a result of the plans to retire approximately 630 MW of coal-fired generation at Petersburg Units 1 and 2 in 2021 and 2023, respectively, AES Indiana filed a petition with the IURC for approvals and cost recovery associated with these retirements, including: (1) approval of AES Indiana's creation of regulatory assets for the net book value of Petersburg units 1 and 2 upon retirement; (2) amortization of the regulatory assets based upon the Company’s depreciation rates; and (3) recovery of the regulatory assets through inclusion in AES Indiana’s rate base and ongoing amortization in AES Indiana’s future rate cases. AES Indiana retired 230 MW Petersburg Unit 1 on May 31, 2021 and has $65.6 million of Petersburg Unit 1 retirement costs recorded in long-term regulatory assets as of June 30, 2021. Excess Distributed Generation Rates On March 1, 2021, AES Indiana filed a petition with the IURC for approval of its proposed rate for the procurement of excess distributed generation ("EDG") and related consumer EDG credit issues. The EDG rate will replace the current net metering program and will be offered beginning July 2022, when net metering is no longer available to new customers. Electric Vehicle Portfolio Program

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2021
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 2020 Form 10-K. Financial Assets VEBA Assets IPALCO 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. 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 " Other income / (expense), net" on the accompanying Unaudited Condensed Consolidated Statements of Operations. FTRs In connection with AES Indiana’s participation in MISO, in the second quarter of each year AES Indiana is granted financial instruments that can be converted into cash or FTRs based on AES Indiana’s forecasted peak load for the period. FTRs are used in the MISO market to hedge AES Indiana’s exposure to congestion charges, which result from constraints on the transmission system. AES Indiana’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. Forward Power Contracts In the second quarter of 2021, we entered into forward purchase power contracts. The forward power contracts have a combined notional amount outstanding of 398,960 MWhs. All changes in the market value of the forward power contracts are recorded in the Consolidated Statements of Operations in the period in which the change occurred. See also Note 4, " Derivative Instruments and Hedging Activities - Derivatives Not Designated as Hedge" for further information. Financial Liabilities Interest Rate Hedges In March 2019, we entered into forward interest rate hedges, which were amended in April 2020. The interest rate hedges have a combined notional amount of $400.0 million. All changes in the market value of the interest rate hedges are recorded in AOCL. See also Note 4, " Derivative Instruments and Hedging Activities - Cash Flow Hedges" for further information. Recurring Fair Value Measurements The fair value of assets and liabilities at June 30, 2021 and December 31, 2020 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 June 30, 2021 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 16 $ 16 $ — $ — Mutual funds 3,515 — 3,515 — Total VEBA investments 3,531 16 3,515 — Financial transmission rights 2,658 — — 2,658 Forward power contracts 2,651 — 2,651 — Total financial assets measured at fair value $ 8,840 $ 16 $ 6,166 $ 2,658 Financial liabilities: Interest rate hedges $ 46,015 $ — $ 46,015 $ — Total financial liabilities measured at fair value $ 46,015 $ — $ 46,015 $ — Assets and Liabilities at Fair Value Level 1 Level 2 Level 3 Fair value at December 31, 2020 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 16 $ 16 $ — $ — Mutual funds 3,209 — 3,209 — Total VEBA investments 3,225 16 3,209 — Financial transmission rights 543 — — 543 Total financial assets measured at fair value $ 3,768 $ 16 $ 3,209 $ 543 Financial liabilities: Interest rate hedges $ 63,215 $ — $ 63,215 $ — Total financial liabilities measured at fair value $ 63,215 $ — $ 63,215 $ — 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: June 30, 2021 December 31, 2020 Face Value Fair Value Face Value Fair Value (In Thousands) Fixed-rate $ 2,683,800 $ 3,179,608 $ 2,683,800 $ 3,295,588 Variable-rate 100,000 100,000 75,000 75,000 Total indebtedness $ 2,783,800 $ 3,279,608 $ 2,758,800 $ 3,370,588 The difference between the face value and the carrying value of this indebtedness consists of the following: • unamortized deferred financing costs of $24.9 million and $26.0 million at June 30, 2021 and December 31, 2020, respectively; and • unamortized discounts of $6.5 million and $6.6 million at June 30, 2021 and December 31, 2020, respectively.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Notes)	6 Months Ended
	Jun. 30, 2021
Derivative Instruments and Hedging Activities [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIESWe use derivatives principally to manage the interest rate risk associated with refinancing our long-term debt and the risk of price changes for purchased power. 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. For further information on the Company’s derivative and hedge accounting policies, see Note 1, " Overview and Summary of Significant Accounting Policies - Financial Derivatives" and Note 5, " Derivative Instruments and Hedging Activities" to IPALCO’s 2020 Form 10-K. At June 30, 2021 , AES Indiana's o u tstanding derivative instruments were as follows: Commodity Accounting Treatment (a) Unit Purchases Sales Net Purchases/(Sales) Interest rate hedges Designated USD $ 400,000 $ — $ 400,000 FTRs Not Designated MWh 13,182 — 13,182 Forward power contracts Not Designated MWh 399 — 399 (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. The following tables provide information on gains or losses recognized in AOCL for the cash flow hedges for the periods indicated: Interest Rate Hedges for the Three Months Ended June 30, $ in thousands (net of tax) 2021 2020 Beginning accumulated derivative loss in AOCL $ (13,826) $ (56,063) Net gains / (losses) associated with current period hedging transactions (17,143) (4,026) Net (gains) / losses reclassified to interest expense, net of tax 1,376 1,344 Ending accumulated derivative loss in AOCL $ (29,593) $ (58,745) Interest Rate Hedges for the Six Months Ended June 30, $ in thousands (net of tax) 2021 2020 Beginning accumulated derivative loss in AOCL $ (43,420) $ (19,750) Net gains / (losses) associated with current period hedging transactions 12,907 (40,339) Net (gains) / losses reclassified to interest expense, net of tax 920 1,344 Ending accumulated derivative loss in AOCL $ (29,593) $ (58,745) Loss expected to be reclassified to earnings in the next twelve months $ (5,375) Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months) 39 Derivatives Not Designated as Hedge FTRs and the forward power contracts do not qualify for hedge accounting or the normal purchases and sales exceptions under ASC 815. Accordingly, FTRs 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. The forward power contracts are recorded at fair value with changes in the fair value charged or credited to the Consolidated Statements of Operations in the period in which the change occurred. Forward power contracts are fair valued using the market approach. This is commonly referred to as "MTM accounting". Realized gains and losses on the forward power contracts will be included in future FAC filings, therefore any realized and unrealized gains and losses are deferred as regulatory liabilities or regulatory assets. For the three and six months ended June 30, 2021, there were unrealized gains of $2.7 million and realized gains of $0.8 million related to the forward power contracts that were deferred and included with deferred fuel costs in "Regulatory assets, current" on the accompanying Condensed Consolidated Balance Sheets. Certain qualifying derivative instruments have been designated as normal purchases or normal sales contracts, as provided under GAAP. Derivative contracts that have been designated as normal purchases or normal sales under GAAP are not subject to hedge or mark to market accounting and are recognized in the consolidated statements of operations on an accrual basis. 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 June 30, 2021, IPALCO did not have any offsetting positions. The following table summarizes the fair value, balance sheet classification and hedging designation of IPALCO's derivative instruments (in thousands): Commodity Hedging Designation Balance sheet classification June 30, 2021 December 31, 2020 Financial transmission rights Not a Cash Flow Hedge Prepayments and other current assets $ 2,658 $ 543 Forward power contracts Not a Cash Flow Hedge Prepayments and other current assets $ 2,651 $ — Interest rate hedges Cash Flow Hedge Derivative liabilities, non-current $ 46,015 $ 63,215

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Indebtedness	DEBT Long-Term Debt The following table presents our long-term debt: June 30, December 31, Series Due 2021 2020 (In Thousands) AES Indiana 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 0.75% (2) April 2026 30,000 30,000 0.95% (2) April 2026 60,000 60,000 Unamortized discount – net (5,930) (6,006) Deferred financing costs (16,939) (17,384) Total AES Indiana first mortgage bonds 1,780,931 1,780,410 Total Long-term Debt – AES Indiana 1,780,931 1,780,410 Long-term Debt – IPALCO: 3.70% Senior Secured Notes September 2024 405,000 405,000 4.25% Senior Secured Notes May 2030 475,000 475,000 Unamortized discount – net (576) (625) Deferred financing costs (7,959) (8,600) Total Long-term Debt – IPALCO 871,465 870,775 Total Consolidated IPALCO Long-term Debt 2,652,396 2,651,185 Less: Current Portion of Long-term Debt — 94,907 Net Consolidated IPALCO Long-term Debt $ 2,652,396 $ 2,556,278 (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) 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. The notes have a final maturity date of December 31, 2038, but are subject to a mandatory put in April 2026. AES Indiana First Mortgage Bonds In July 2021, the Indiana Finance Authority issued on behalf of AES Indiana an aggregate principal amount of $95 million of Environmental Facilities Refunding Revenue Bonds, Series 2021A&B. AES Indiana issued $95 million aggregate principal amount of first mortgage bonds to the Indiana Finance Authority in two series: $55 million Series 2021A bonds at 1.40% due August 1, 2029 and $40 million Series 2021B notes at 0.65% due August 1, 2025 to secure the loan of proceeds from these bonds issued by the Indiana Finance Authority. Proceeds of the bonds were used to refund $95 million of Indiana Finance Authority Environmental Facilities Refunding Revenue Bonds Series 2011A&B due August 1, 2021 at a redemption price of 100%. As a result of this refinancing, the $95 million of Indiana Finance Authority Environmental Facilities Refunding Revenue Bonds Series 2011A&B due August 1, 2021 are presented as long-term debt as of June 30, 2021. IPALCO’s Senior Secured Notes and Term Loan In April 2020, IPALCO completed the sale of the $475 million aggregate principal amount of 4.25% 2030 IPALCO Notes pursuant to Rule 144A and Regulation S under the Securities Act of 1933, as amended. We used the net proceeds from this offering to retire the $65 million Term Loan on April 14, 2020. The remaining net proceeds, together with cash on hand, were used to redeem the 2020 IPALCO Notes on May 14, 2020, and to pay certain related fees, expenses and make-whole premiums. A loss on early extinguishment of debt of $2.4 million for the 2020 IPALCO Notes is included as a separate line item within " Other Income/(Expense), Net " in the accompanying Unaudited Condensed Consolidated Statements of Operations. Pursuant to a registration rights agreement dated April 14, 2020, IPALCO agreed to register the 2030 IPALCO Notes under the Securities Act by filing an exchange offer registration statement or, under specified circumstances, a shelf registration statement with the SEC. IPALCO filed a registration statement on Form S-4 with respect to the 2030 IPALCO Notes with the SEC on March 22, 2021 in respect of its obligations under such registration rights agreement, and this registration statement was declared effective on April 7, 2021. The exchange offer closed on May 11, 2021. Line of Credit

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Effective Tax Rate IPALCO’s effective combined state and federal income tax rate was 20.7% and 20.6% for the three and six months ended June 30, 2021, respectively, as compared to 21.3% and 21.3% for the three and six months ended June 30, 2020, respectively. The decrease in the effective tax rate versus the comparable periods was primarily due to the impact of the reversal of excess deferred income taxes as a percentage of pre-tax income. The rates for the three and six months ended June 30, 2021 are lower than the combined federal and state statutory rate of 25.01% primarily due to the flowthrough of the net tax benefit related to the reversal of excess deferred taxes of AES Indiana, which was partially offset by the net tax expense related to the amortization of allowance for equity funds used during construction.

Benefit Plans

Benefit Plans	6 Months Ended
	Jun. 30, 2021
Retirement Benefits [Abstract]
Benefit Plans	BENEFIT PLANS Pension Expense The following table presents net periodic benefit (credit) / cost information relating to the Pension Plans combined: For the Three Months Ended For the Six Months Ended June 30, June 30, 2021 2020 2021 2020 (In Thousands) (In Thousands) Components of net periodic benefit (credit) / cost: Service cost $ 2,335 $ 2,068 $ 4,669 $ 4,136 Interest cost 3,915 5,538 7,830 11,076 Expected return on plan assets (10,454) (9,445) (20,908) (18,890) Amortization of prior service cost 736 919 1,472 1,838 Amortization of actuarial loss 1,382 2,028 2,764 4,057 Net periodic benefit (credit) / cost $ (2,086) $ 1,108 $ (4,173) $ 2,217 The components of net periodic benefit (credits) / costs other than service costs are included in "Other income, net" in the Unaudited Condensed Consolidated Statements of Operations. In addition, AES Indiana 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 $4.4 million and $4.3 million at June 30, 2021 and December 31, 2020, respectively, were not material to the Financial Statements in the periods covered by this report.

Commitments And Contingencies

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES Legal Loss Contingencies IPALCO and AES Indiana are involved in litigation arising in the normal course of business. We accrue for litigation and claims when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. As of June 30, 2021 and December 31, 2020, total legal loss contingencies accrued were $13.4 million and $13.4 million, respectively, which were included in " Other Non-Current Liabilities," on the accompanying Unaudited Condensed Consolidated Balance Sheets. A significant portion of these accrued liabilities relate to a personal injury judgement that is currently under appeal and involved injuries to a contractor. We maintain an amount of insurance protection for such litigation that we believe is adequate. While the ultimate outcome of outstanding litigation cannot be predicted with certainty, management believes that final outcomes will not have a material adverse effect on IPALCO’s results of operations, financial condition and cash flows. 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 assure 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, AES Indiana received a NOV and Finding of Violation from the EPA pursuant to the CAA Section 113(a). The NOV alleged violations of the CAA at AES Indiana’s three primarily coal-fired electric generating facilities at the time, dating back to 1986. The alleged violations primarily pertain to the PSD and non-attainment New Source Review (NSR) requirements under the CAA. In addition, on October 1, 2015, AES Indiana 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 AES Indiana Petersburg Unit 3. Also, on February 5, 2016, the EPA issued a NOV pursuant to CAA Section 113(a) alleging violations of PSD, non-attainment NSR and other CAA regulations, the Indiana SIP, and the Title V operating permit at Petersburg Generating Station. On August 31, 2020, AES Indiana reached a settlement with the EPA, the DOJ and IDEM resolving the purported violations of the CAA with respect to the four coal-fired generation units at AES Indiana's Petersburg location. The settlement agreement, in the form of a proposed judicial consent decree, was approved and entered by the U.S. District Court for the Southern District of Indiana on March 23, 2021, and includes, among other items, the following requirements: annual caps on NO x and SO 2 emissions and more stringent emissions limits than AES Indiana's current Title V air permit; payment of civil penalties totaling $1.525 million (the payment of which was satisfied by AES Indiana in April 2021); a $5 million environmental mitigation project consisting of the construction and operation of a new, non-emitting source of generation at the site; expenditure of $0.325 million on a state-only environmentally beneficial project to preserve local, ecologically-significant lands; and retirement of Units 1 and 2 prior to July 1, 2023. If AES Indiana does not meet this retirement obligation, it must install a Selective Non-Catalytic Reduction System (SNCR) on Unit 4. AES Indiana had a contingent liability recorded related to these New Source Review and other CAA NOV matters.

Business Segment Information (N

Business Segment Information (Notes)	6 Months Ended
	Jun. 30, 2021
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 AES Indiana, 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 2024 IPALCO Notes and 2030 IPALCO Notes and related interest expense, balance associated with IPALCO's interest rate hedges, cash and other immaterial balances. 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 June 30, 2021 June 30, 2020 Utility All Other Total Utility All Other Total Revenues $ 330,587 $ — $ 330,587 $ 311,503 $ — $ 311,503 Depreciation and amortization $ 62,994 $ — $ 62,994 $ 61,099 $ — $ 61,099 Interest expense $ 21,255 $ 10,944 $ 32,199 $ 21,882 $ 12,053 $ 33,935 Earnings/(loss) from operations before income tax $ 32,587 $ (10,872) $ 21,715 $ 38,770 $ (14,482) $ 24,288 Six Months Ended Six Months Ended June 30, 2021 June 30, 2020 Utility All Other Total Utility All Other Total Revenues $ 692,788 $ — $ 692,788 $ 668,885 $ — $ 668,885 Depreciation and amortization $ 126,083 $ — $ 126,083 $ 121,807 $ — $ 121,807 Interest expense $ 42,776 $ 19,490 $ 62,266 $ 43,802 $ 20,214 $ 64,016 Earnings/(loss) from operations before income tax $ 89,882 $ (19,348) $ 70,534 $ 93,737 $ (23,694) $ 70,043 Capital expenditures (1) $ 132,341 $ — $ 132,341 $ 92,848 $ — $ 92,848 As of June 30, 2021 As of December 31, 2020 Utility All Other Total Utility All Other Total Total assets $ 4,975,344 $ 18,861 $ 4,994,205 $ 4,952,408 $ 17,511 $ 4,969,919

Revenue (Notes)

Revenue (Notes)	6 Months Ended
	Jun. 30, 2021
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 2020 Form 10-K for further discussion of our retail, wholesale and miscellaneous revenues. AES Indiana’s revenue from contracts with customers was $318.5 million and $302.4 million for the three months ended June 30, 2021 and 2020, respectively, and $672.2 million and $654.3 million for the six months ended June 30, 2021 and 2020, 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 June 30, 2021 June 30, 2020 Retail Revenues Retail revenue from contracts with customers: Residential $ 129,254 $ 127,752 Small commercial and industrial 48,208 43,402 Large commercial and industrial 127,009 119,302 Public lighting 2,270 2,309 Other (1) 4,175 2,805 Total retail revenue from contracts with customers 310,916 295,570 Alternative revenue programs 11,710 8,789 Wholesale Revenues Wholesale revenues from contracts with customers: 4,918 4,501 Miscellaneous Revenues Transmission and other revenue from contracts with customers 2,692 2,329 Other miscellaneous revenues (2) 351 314 Total Revenues $ 330,587 $ 311,503 (1) Other retail revenue from contracts with customers includes miscellaneous charges to customers (2) Other miscellaneous revenue includes lease and other miscellaneous revenues not accounted for under ASC 606 For the Six Months Ended For the Six Months Ended June 30, 2021 June 30, 2020 Retail Revenues Retail revenue from contracts with customers: Residential $ 289,757 $ 283,161 Small commercial and industrial 102,725 97,655 Large commercial and industrial 240,449 241,340 Public lighting 4,456 4,614 Other (1) 8,366 6,693 Total retail revenue from contracts with customers 645,753 633,463 Alternative revenue programs 19,305 13,684 Wholesale Revenues Wholesale revenues from contracts with customers: 21,027 15,809 Miscellaneous Revenues Transmission and other revenue from contracts with customers 5,373 5,061 Other miscellaneous revenues (2) 1,330 868 Total Revenues $ 692,788 $ 668,885 (1) Other retail revenue from contracts with customers includes miscellaneous charges to customers (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 $149.8 million and $163.8 million as of June 30, 2021 and December 31, 2020, respectively. Payment terms for all receivables from contracts with customers typically do not extend beyond 30 days. Contract Balances — The timing of revenue recognition, billings, and cash collections results in accounts receivable and contract liabilities. The contract liabilities from contracts with customers were $0.0 million and $0.5 million as of June 30, 2021 and December 31, 2020, respectively. During the three months ended June 30, 2021 and 2020, we recognized revenue of $0.2 million and $0.3 million related to this contract liability balance, respectively. During the

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Lessor, Leases [Policy Text Block]	LEASES 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 $0.3 million and $0.2 million for the three months ended June 30, 2021 and 2020, respectively, and was $0.6 million and $0.5 million for the six months ended June 30, 2021 and 2020, respectively. Underlying gross assets and accumulated depreciation of operating leases included in Total net property, plant and equipment on the Unaudited Condensed Consolidated Balance Sheet were $4.6 million and $1.0 million, respectively, as of June 30, 2021 and $4.3 million and $0.8 million, respectively, as of December 31, 2020. 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 June 30, 2021. The following table shows the future minimum lease receipts as of June 30, 2021 for the remainder of 2021 through 2025 and thereafter (in thousands): Operating Leases 2021 $ 443 2022 903 2023 906 2024 786 2025 553 Thereafter 2,113 Total $ 5,704

Risks and Uncertainties (Notes)

Risks and Uncertainties (Notes)	6 Months Ended
	Jun. 30, 2021
Risks and Uncertainties [Abstract]
Risks and Uncertainties	RISKS AND UNCERTAINTIES COVID-19 Pandemic The COVID-19 pandemic has impacted global economic activity, including electricity and energy consumption, and caused significant volatility in financial markets. Many countries, including the U.S., reacted to the pandemic by instituting quarantines and mandating business and school closures or limitations and other social distancing measures. Responses to the COVID-19 pandemic by the State of Indiana and its residents and businesses continue to evolve as vaccine availability and usage continues and the State and businesses review and adjust the scope requirements of social distancing measures. Social distancing measures designed to slow the spread of the virus, such as business closures and operations limitations, impact energy demand within our service territory. We continue to take a variety of measures in response to the spread of COVID-19 to ensure our ability to generate, transmit, distribute and sell electric energy, ensure the health and safety of our employees, contractors, customers and communities and provide essential services to the communities in which we operate. In addition to the impacts to demand within our service territory, we also have incurred and may continue to incur expenses relating to COVID-19, including those that relate to events outside of our control. The magnitude and duration of the COVID-19 pandemic is unknown at this time and may have material and adverse effects on our results of operations, financial condition and cash flows in future periods.

Overview and Summary Of Signi_2

Overview and Summary Of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Receivable [Policy Text Block]	Accounts Receivable The following table summarizes our accounts receivable balances at June 30, 2021 and December 31, 2020: June 30, December 31, 2021 2020 (In Thousands) Accounts receivable, net Customer receivables $ 84,477 $ 91,335 Unbilled revenue 66,530 72,334 Amounts due from related parties — 490 Other 9,508 4,189 Allowance for credit losses (1,553) (3,155) Total accounts receivable, net $ 158,962 $ 165,193
Inventory, Policy [Policy Text Block]	The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the periods indicated (in Thousands): Six Months Ended June 30, 2021 Beginning Allowance Balance at January 1, 2021 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 3,155 $ 1,030 $ (3,741) $ 1,109 $ 1,553 Six Months Ended June 30, 2020 Beginning Allowance Balance at January 1, 2020 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 921 $ 4,312 $ (3,697) $ 2,517 $ 4,053 The allowance for credit losses primarily relates to utility customer receivables, including unbilled amounts. Expected credit loss estimates are developed by disaggregating customers into those with similar credit risk characteristics and using historical credit loss experience. In addition, we also consider how current and future economic conditions are expected to impact collectability, as applicable, including the economic impacts of the COVID-19 pandemic on our receivable balance as of June 30, 2021. Amounts are written off when reasonable collections efforts have been exhausted. During 2021, the current period provision and allowance for credit losses have decreased due to lower past due customer receivable balances. Inventories The following table summarizes our inventories balances at June 30, 2021 and December 31, 2020: June 30, December 31, 2021 2020 (In Thousands) Inventories Fuel $ 21,328 $ 36,953 Materials and supplies, net 60,132 58,553 Total inventories $ 81,460 $ 95,506
Consolidation, Policy [Policy Text Block]	Consolidation The accompanying Financial Statements include the accounts of IPALCO, AES Indiana and Mid-America Capital Resources, Inc., a non-regulated wholly-owned subsidiary of IPALCO. All significant intercompany amounts have been eliminated in consolidation. Interim Financial Presentation The accompanying Financial Statements are unaudited; however, they have been prepared in accordance with GAAP, as contained in the FASB ASC, for interim financial information and Article 10 of Regulation S-X issued by the SEC. Accordingly, they do not include all the information and footnotes required by GAAP for annual fiscal reporting periods. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of the results of operations, financial position, comprehensive income, changes in equity, and cash flows. 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 2020 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	.
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 Unaudited Condensed Consolidated Statements of Cash Flows: June 30, December 31, 2021 2020 (In Thousands) Cash, cash equivalents and restricted cash Cash and cash equivalents $ 20,629 $ 20,502 Restricted cash 5 6,120 Total cash, cash equivalents and restricted cash $ 20,634 $ 26,622
New Accounting Pronouncements	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 2020-04, Reference Rate Form (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting The amendments in these updates provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference to LIBOR or another reference rate expected to be discontinued by reference rate reform, and clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. These amendments are effective for a limited period of time (March 12, 2020 - December 21, 2022). March 12, 2020 - December 31, 2022 The Company is currently evaluating the impact of adopting the standard on the Financial Statements.
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block]	The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the periods indicated (in Thousands): Six Months Ended June 30, 2021 Beginning Allowance Balance at January 1, 2021 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 3,155 $ 1,030 $ (3,741) $ 1,109 $ 1,553 Six Months Ended June 30, 2020 Beginning Allowance Balance at January 1, 2020 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 921 $ 4,312 $ (3,697) $ 2,517 $ 4,053 The allowance for credit losses primarily relates to utility customer receivables, including unbilled amounts. Expected credit loss estimates are developed by disaggregating customers into those with similar credit risk characteristics and using historical credit loss experience. In addition, we also consider how current and future economic conditions are expected to impact collectability, as applicable, including the economic impacts of the COVID-19 pandemic on our receivable balance as of June 30, 2021. Amounts are written off when reasonable collections efforts have been exhausted. During 2021, the current period provision and allowance for credit losses have decreased due to lower past due customer receivable balances.

Leases, Codification Topic 842

Leases, Codification Topic 842 (Policies)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Lessor, Leases [Policy Text Block]	LEASES 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 $0.3 million and $0.2 million for the three months ended June 30, 2021 and 2020, respectively, and was $0.6 million and $0.5 million for the six months ended June 30, 2021 and 2020, respectively. Underlying gross assets and accumulated depreciation of operating leases included in Total net property, plant and equipment on the Unaudited Condensed Consolidated Balance Sheet were $4.6 million and $1.0 million, respectively, as of June 30, 2021 and $4.3 million and $0.8 million, respectively, as of December 31, 2020. 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 June 30, 2021. The following table shows the future minimum lease receipts as of June 30, 2021 for the remainder of 2021 through 2025 and thereafter (in thousands): Operating Leases 2021 $ 443 2022 903 2023 906 2024 786 2025 553 Thereafter 2,113 Total $ 5,704

Overview and Summary Of Signi_3

Overview and Summary Of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The following table summarizes our accounts receivable balances at June 30, 2021 and December 31, 2020: June 30, December 31, 2021 2020 (In Thousands) Accounts receivable, net Customer receivables $ 84,477 $ 91,335 Unbilled revenue 66,530 72,334 Amounts due from related parties — 490 Other 9,508 4,189 Allowance for credit losses (1,553) (3,155) Total accounts receivable, net $ 158,962 $ 165,193
Allowance for Credit Losses [Table Text Block]	The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the periods indicated (in Thousands): Six Months Ended June 30, 2021 Beginning Allowance Balance at January 1, 2021 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 3,155 $ 1,030 $ (3,741) $ 1,109 $ 1,553 Six Months Ended June 30, 2020 Beginning Allowance Balance at January 1, 2020 Current Period Provision Write-offs Charged Against Allowances Recoveries Collected Ending Allowance Balance at Allowance for credit losses $ 921 $ 4,312 $ (3,697) $ 2,517 $ 4,053
Schedule of Inventory, Current [Table Text Block]	The following table summarizes our inventories balances at June 30, 2021 and December 31, 2020: June 30, December 31, 2021 2020 (In Thousands) Inventories Fuel $ 21,328 $ 36,953 Materials and supplies, net 60,132 58,553 Total inventories $ 81,460 $ 95,506
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 Unaudited Condensed Consolidated Statements of Cash Flows: June 30, December 31, 2021 2020 (In Thousands) Cash, cash equivalents and restricted cash Cash and cash equivalents $ 20,629 $ 20,502 Restricted cash 5 6,120 Total cash, cash equivalents and restricted cash $ 20,634 $ 26,622
Reclassification out of Accumulated Other Comprehensive Income	The amounts reclassified out of AOCL by component during the three and six months ended June 30, 2021 and 2020 are as follows (in thousands): Details about AOCL components Affected line item in the Condensed Consolidated Statements of Operations Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Gains and losses on cash flow hedges (Note 4): Interest expense $ 1,807 $ 1,807 $ 1,204 $ 1,807 Income tax expense (431) (463) (284) (463) Total reclassifications for the period, net of income taxes $ 1,376 $ 1,344 $ 920 $ 1,344

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2021
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 June 30, 2021 and December 31, 2020 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 June 30, 2021 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 16 $ 16 $ — $ — Mutual funds 3,515 — 3,515 — Total VEBA investments 3,531 16 3,515 — Financial transmission rights 2,658 — — 2,658 Forward power contracts 2,651 — 2,651 — Total financial assets measured at fair value $ 8,840 $ 16 $ 6,166 $ 2,658 Financial liabilities: Interest rate hedges $ 46,015 $ — $ 46,015 $ — Total financial liabilities measured at fair value $ 46,015 $ — $ 46,015 $ — Assets and Liabilities at Fair Value Level 1 Level 2 Level 3 Fair value at December 31, 2020 Based on quoted market prices in active markets Other observable inputs Unobservable inputs (In Thousands) Financial assets: VEBA investments: Money market funds $ 16 $ 16 $ — $ — Mutual funds 3,209 — 3,209 — Total VEBA investments 3,225 16 3,209 — Financial transmission rights 543 — — 543 Total financial assets measured at fair value $ 3,768 $ 16 $ 3,209 $ 543 Financial liabilities: Interest rate hedges $ 63,215 $ — $ 63,215 $ — Total financial liabilities measured at fair value $ 63,215 $ — $ 63,215 $ —
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: June 30, 2021 December 31, 2020 Face Value Fair Value Face Value Fair Value (In Thousands) Fixed-rate $ 2,683,800 $ 3,179,608 $ 2,683,800 $ 3,295,588 Variable-rate 100,000 100,000 75,000 75,000 Total indebtedness $ 2,783,800 $ 3,279,608 $ 2,758,800 $ 3,370,588

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2021
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 AOCL for the cash flow hedges for the periods indicated: Interest Rate Hedges for the Three Months Ended June 30, $ in thousands (net of tax) 2021 2020 Beginning accumulated derivative loss in AOCL $ (13,826) $ (56,063) Net gains / (losses) associated with current period hedging transactions (17,143) (4,026) Net (gains) / losses reclassified to interest expense, net of tax 1,376 1,344 Ending accumulated derivative loss in AOCL $ (29,593) $ (58,745)
Schedule of Derivative Instruments [Table Text Block]	At June 30, 2021 , AES Indiana's o u tstanding derivative instruments were as follows: Commodity Accounting Treatment (a) Unit Purchases Sales Net Purchases/(Sales) Interest rate hedges Designated USD $ 400,000 $ — $ 400,000 FTRs Not Designated MWh 13,182 — 13,182 Forward power contracts Not Designated MWh 399 — 399 (a) Refers to whether the derivative instruments have been designated as a cash flow hedge.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule Long-Term Indebtedness	The following table presents our long-term debt: June 30, December 31, Series Due 2021 2020 (In Thousands) AES Indiana 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 0.75% (2) April 2026 30,000 30,000 0.95% (2) April 2026 60,000 60,000 Unamortized discount – net (5,930) (6,006) Deferred financing costs (16,939) (17,384) Total AES Indiana first mortgage bonds 1,780,931 1,780,410 Total Long-term Debt – AES Indiana 1,780,931 1,780,410 Long-term Debt – IPALCO: 3.70% Senior Secured Notes September 2024 405,000 405,000 4.25% Senior Secured Notes May 2030 475,000 475,000 Unamortized discount – net (576) (625) Deferred financing costs (7,959) (8,600) Total Long-term Debt – IPALCO 871,465 870,775 Total Consolidated IPALCO Long-term Debt 2,652,396 2,651,185 Less: Current Portion of Long-term Debt — 94,907 Net Consolidated IPALCO Long-term Debt $ 2,652,396 $ 2,556,278 (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) 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. The notes have a final maturity date of December 31, 2038, but are subject to a mandatory put in April 2026.

Benefit Plans (Tables)

Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Retirement Benefits [Abstract]
Schedule Of Net Periodic Benefit Costs	The following table presents net periodic benefit (credit) / cost information relating to the Pension Plans combined: For the Three Months Ended For the Six Months Ended June 30, June 30, 2021 2020 2021 2020 (In Thousands) (In Thousands) Components of net periodic benefit (credit) / cost: Service cost $ 2,335 $ 2,068 $ 4,669 $ 4,136 Interest cost 3,915 5,538 7,830 11,076 Expected return on plan assets (10,454) (9,445) (20,908) (18,890) Amortization of prior service cost 736 919 1,472 1,838 Amortization of actuarial loss 1,382 2,028 2,764 4,057 Net periodic benefit (credit) / cost $ (2,086) $ 1,108 $ (4,173) $ 2,217

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
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 June 30, 2021 June 30, 2020 Utility All Other Total Utility All Other Total Revenues $ 330,587 $ — $ 330,587 $ 311,503 $ — $ 311,503 Depreciation and amortization $ 62,994 $ — $ 62,994 $ 61,099 $ — $ 61,099 Interest expense $ 21,255 $ 10,944 $ 32,199 $ 21,882 $ 12,053 $ 33,935 Earnings/(loss) from operations before income tax $ 32,587 $ (10,872) $ 21,715 $ 38,770 $ (14,482) $ 24,288 Six Months Ended Six Months Ended June 30, 2021 June 30, 2020 Utility All Other Total Utility All Other Total Revenues $ 692,788 $ — $ 692,788 $ 668,885 $ — $ 668,885 Depreciation and amortization $ 126,083 $ — $ 126,083 $ 121,807 $ — $ 121,807 Interest expense $ 42,776 $ 19,490 $ 62,266 $ 43,802 $ 20,214 $ 64,016 Earnings/(loss) from operations before income tax $ 89,882 $ (19,348) $ 70,534 $ 93,737 $ (23,694) $ 70,043 Capital expenditures (1) $ 132,341 $ — $ 132,341 $ 92,848 $ — $ 92,848 As of June 30, 2021 As of December 31, 2020 Utility All Other Total Utility All Other Total Total assets $ 4,975,344 $ 18,861 $ 4,994,205 $ 4,952,408 $ 17,511 $ 4,969,919

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
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 June 30, 2021 June 30, 2020 Retail Revenues Retail revenue from contracts with customers: Residential $ 129,254 $ 127,752 Small commercial and industrial 48,208 43,402 Large commercial and industrial 127,009 119,302 Public lighting 2,270 2,309 Other (1) 4,175 2,805 Total retail revenue from contracts with customers 310,916 295,570 Alternative revenue programs 11,710 8,789 Wholesale Revenues Wholesale revenues from contracts with customers: 4,918 4,501 Miscellaneous Revenues Transmission and other revenue from contracts with customers 2,692 2,329 Other miscellaneous revenues (2) 351 314 Total Revenues $ 330,587 $ 311,503 (1) Other retail revenue from contracts with customers includes miscellaneous charges to customers (2) Other miscellaneous revenue includes lease and other miscellaneous revenues not accounted for under ASC 606

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Operating Lease, Lease Income [Table Text Block]	The following table shows the future minimum lease receipts as of June 30, 2021 for the remainder of 2021 through 2025 and thereafter (in thousands): Operating Leases 2021 $ 443 2022 903 2023 906 2024 786 2025 553 Thereafter 2,113 Total $ 5,704

Overview and Summary of Signi_4

Overview and Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021USD ($)generating_stationMW	Mar. 31, 2021USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2021USD ($)generating_stationMW	Jun. 30, 2020USD ($)	May 31, 2021	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 526,680	$ 558,531	$ 507,839	$ 518,761	$ 526,680	$ 507,839		$ 520,988	$ 546,476
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,593)				(29,593)			(43,420)	(19,750)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(17,143)		(4,026)		12,907	(40,339)
Inventories	21,328				21,328			36,953
Cash and cash equivalents	$ 20,629				$ 20,629			20,502
Number of customers	514,000				514,000
Number of generating stations | generating_station	4				4
Restricted Cash and Cash Equivalents	$ 5				$ 5			6,120
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	20,634		53,251		20,634	53,251		26,622	48,552
Regulatory assets, current	60,132				60,132			58,553
Inventory, Net	81,460				81,460			95,506
Other Comprehensive Income (Loss), Net of Tax	(15,767)	29,594	(2,682)	(36,313)	13,827	(38,995)
Accounts Receivable, Allowance for Credit Loss, Current	1,553		4,053		1,553	4,053		3,155	921
Accounts Receivable, Credit Loss Expense (Reversal)					1,030	4,312
Accounts Receivable, Allowance for Credit Loss, Writeoff					(3,741)	(3,697)
Accounts Receivable, Allowance for Credit Loss, Recovery					1,109	2,517
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,593)				(29,593)			$ (43,420)	$ (19,750)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(17,143)		(4,026)		12,907	(40,339)
Income Tax Expense (Benefit)	4,505		5,165		14,540	14,937
Income Tax Expense (Benefit)	4,505		5,165		14,540	14,937
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	$ 1,376		1,344		$ 920	1,344
Petersburg Unit 1 retired MW							230
Petersburg Unit 2 Planned Retirement MW in 2023					415
Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Electric generation capability for winter, megawatts | MW	3,475				3,475
Electric generation capability for summer, megawatts | MW	3,330				3,330
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]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ (29,593)	$ (13,826)	(58,745)	$ (56,063)	$ (29,593)	(58,745)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Debt Instrument [Line Items]
Interest and Debt Expense	(1,807)		(1,807)		(1,204)	(1,807)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and Debt Expense	(1,807)		(1,807)		(1,204)	(1,807)
Income Tax Expense (Benefit)	431		463		284	463
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,376		1,344		920	1,344
Income Tax Expense (Benefit)	431		463		284	463
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 1,376		$ 1,344		$ 920	$ 1,344

Overview and Summary Of Signi_5

Overview and Summary Of Significant Accounting Policies Schedule of cash, restricted cash and cash equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 20,629	$ 20,502
Restricted Cash and Cash Equivalents	5	6,120
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 20,634	$ 26,622	$ 53,251	$ 48,552

Overview and Summary Of Signi_6

Overview and Summary Of Significant Accounting Policies Schedule of Accounts and notes receivable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from Customers	$ 84,477		$ 91,335
Unbilled Receivables, Current	66,530		72,334
Accounts Receivable, Related Parties	0		490
Other Receivables	9,508		4,189
Accounts Receivable, Allowance for Credit Loss	(1,553)		(3,155)
Accounts Receivable, after Allowance for Credit Loss, Current	158,962		165,193
Accounts Receivable, Allowance for Credit Loss, Current	1,553	$ 4,053	$ 3,155	$ 921
Accounts Receivable, Credit Loss Expense (Reversal)	1,030	4,312
Accounts Receivable, Allowance for Credit Loss, Writeoff	(3,741)	(3,697)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 1,109	$ 2,517

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)	Aug. 02, 2021	May 31, 2021	Dec. 31, 2020USD ($)
Regulatory Matters [Line Items]
Total current regulatory assets	$ 62,188			$ 45,430
Total long-term regulatory assets	372,339			392,801
Total current regulatory liabilities	12,503			30,036
Total long-term regulatory liabilities	$ 830,788			$ 839,360
Preferred Resource Portfolio Coal-Fired Generation Retirement MW by 2023	630
Solar Project Acquisition MW Expected Completion in 2023	195
Estimated Projected Costs for Successful Proposed EV Portfolio Implementation	$ 5,100
Period of Time for Implementation of Services Propsed in the Electric Vehicle (EV) Portfolio	3
Petersburg Unit 1 retired MW			230
Petersburg Unit 1 retirement
Regulatory Matters [Line Items]
Total long-term regulatory assets	$ 65,600
Subsequent Event [Member]
Regulatory Matters [Line Items]
AES Indiana solar MW planned to acquire		250
AES Indiana energy storage facility MWh planned to acquire		180
AES Indiana solar MW planned to acquire		250
AES Indiana energy storage facility MWh planned to acquire		180

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Financial Transmission Rights Fair Value Disclosure	$ 2,658	$ 543
Forward Power Contracts Fair Value Disclosure	2,651
Investments, Fair Value Disclosure	3,531	3,225
Asset retirement obligations	194,926	195,236
Unamortized deferred financing costs	24,900	26,000
Unamortized debt discount	6,500	6,600
Financial Transmission Rights Fair Value Disclosure	2,658	543
Assets, Fair Value Disclosure	8,840	3,768
Derivative Liability		63,215
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 46,015	63,215
Forward Power Contracts Combined Notional Amount Outstanding	398,960
Money Market Funds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	$ 16	16
Mutual Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	3,515	3,209
Fair Value, Inputs, Level 3 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Financial Transmission Rights Fair Value Disclosure	2,658	543
Forward Power Contracts Fair Value Disclosure	0
Investments, Fair Value Disclosure	0	0
Financial Transmission Rights Fair Value Disclosure	2,658	543
Assets, Fair Value Disclosure	2,658	543
Derivative Liability		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
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]
Financial Transmission Rights Fair Value Disclosure	0	0
Forward Power Contracts Fair Value Disclosure	2,651
Investments, Fair Value Disclosure	3,515	3,209
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	6,166	3,209
Derivative Liability		63,215
Financial and Nonfinancial Liabilities, Fair Value Disclosure	46,015	63,215
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	3,515	3,209
Fair Value, Inputs, Level 1 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Financial Transmission Rights Fair Value Disclosure	0	0
Forward Power Contracts Fair Value Disclosure	0
Investments, Fair Value Disclosure	16	16
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	16	16
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	16	16
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	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 3,531	$ 3,225
Financial Transmission Rights Fair Value Disclosure	2,658	543
Assets, Fair Value Disclosure	8,840	3,768
Interest Rate Cash Flow Hedge Liability at Fair Value	46,015
Derivative Liability		63,215
Financial and Nonfinancial Liabilities, Fair Value Disclosure	46,015	63,215
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	16	16
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	16	16
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	3,515	3,209
Financial Transmission Rights Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	6,166	3,209
Interest Rate Cash Flow Hedge Liability at Fair Value	46,015
Derivative Liability		63,215
Financial and Nonfinancial Liabilities, Fair Value Disclosure	46,015	63,215
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	2,658	543
Assets, Fair Value Disclosure	2,658	543
Interest Rate Cash Flow Hedge Liability at Fair Value	0
Derivative Liability		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	16	16
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	16	16
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	3,515	3,209
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	3,515	3,209
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	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 6,500	$ 6,600
Face Value	2,783,800	2,758,800
Fair Value	3,279,608	3,370,588
Fixed Rate [Member]
Debt Instrument [Line Items]
Face Value	2,683,800	2,683,800
Fair Value	3,179,608	3,295,588
Variable Rate [Member]
Debt Instrument [Line Items]
Face Value	100,000	75,000
Fair Value	$ 100,000	$ 75,000

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) MWh in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021USD ($)MWh	Mar. 31, 2021USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2021USD ($)MWh	Jun. 30, 2020USD ($)	Aug. 02, 2021	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Other Comprehensive Income (Loss), Net of Tax	$ (15,767,000)	$ 29,594,000	$ (2,682,000)	$ (36,313,000)	$ 13,827,000	$ (38,995,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(17,143,000)		(4,026,000)		12,907,000	(40,339,000)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	1,376,000		1,344,000		920,000	1,344,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,593,000)				(29,593,000)			$ (43,420,000)	$ (19,750,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(17,143,000)		(4,026,000)		12,907,000	(40,339,000)
Regulatory assets	62,188,000				62,188,000			45,430,000
Regulatory assets	$ 62,188,000				$ 62,188,000			45,430,000
Subsequent Event [Member]
AES Indiana energy storage facility MWh planned to acquire							180
AES Indiana solar MW planned to acquire							250
AES Indiana energy storage facility MWh planned to acquire							180
FTR [Member] | Not Designated as Hedging Instrument [Member]
Purchase of Units Derivative Instruments Financial Transmission Rights | MWh	13,182				13,182
Sale of Units Derivative Instruments Financial Transmission Rights | MWh	0				0
Derivative, Nonmonetary Notional Amount, Purchase (Sales), Net | MWh	13,182				13,182
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
Interest Rate Contract [Member]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(29,593,000)	$ (13,826,000)	$ (58,745,000)	$ (56,063,000)	(29,593,000)	$ (58,745,000)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ (5,375,000)				$ (5,375,000)
Maximum Length of Time Hedged in Cash Flow Hedge					39 months
Forward power contracts | Not Designated as Hedging Instrument [Member]
Purchase of Units Derivative Instruments Financial Transmission Rights | MWh	399				399
Sale of Units Derivative Instruments Financial Transmission Rights | MWh	0				0
Derivative, Nonmonetary Notional Amount, Purchase (Sales), Net | MWh	399				399
Unrealized Gain (Loss) on Derivatives	$ 2,700,000				$ 2,700,000
Realized Gain (Loss) on Derivatives	800,000				800,000
Unrealized Gain (Loss) on Derivatives	2,700,000				2,700,000
Realized Gain (Loss) on Derivatives	800,000				800,000
Other Current Assets [Member] | FTR [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Fair Value, Gross Asset								543,000
Other Current Assets [Member] | Forward power contracts | Not Designated as Hedging Instrument [Member]
Derivative Asset, Fair Value, Gross Asset								0
Derivative Liability, Noncurrent | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability, Fair Value, Gross Liability	$ 46,015,000				$ 46,015,000			$ 63,215,000

Debt (Schedule Long-Term Indebt

Debt (Schedule Long-Term Indebtedness) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Apr. 14, 2020
Debt Instrument [Line Items]
Unamortized discount - net	$ (6,500)	$ (6,600)
Deferred financing costs	(24,900)	(26,000)
Long-term debt	2,652,396	2,651,185
Less: Current Portion of Long-term Debt	0	94,907
Net Consolidated IPALCO Long-term Debt	2,652,396	2,556,278
Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
First mortgage bonds	1,780,931	1,780,410
Unamortized discount - net	(5,930)	(6,006)
Long-term debt	$ 1,780,931	1,780,410
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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
First mortgage bonds	$ 105,000	105,000
Indianapolis Power And Light Company [Member] | FMB Twenty - two
Debt Instrument [Line Items]
Debt, stated interest rate	0.75%
First mortgage bonds	$ 30,000	30,000
Indianapolis Power And Light Company [Member] | FMB Twenty - three
Debt Instrument [Line Items]
Debt, stated interest rate	0.95%
First mortgage bonds	$ 60,000	60,000
Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Unamortized discount - net	(576)	(625)
Deferred financing costs	(7,959)	(8,600)
Net Consolidated IPALCO Long-term Debt	$ 871,465	870,775
Ipalco Enterprises, Inc. [Member] | Bank Term Loan Maturing July 2020 [Member]
Debt Instrument [Line Items]
Long-term debt			$ 65,000
Ipalco Enterprises, Inc. [Member] | Three Point Seven Zero Percent Senior Secured Notes [Domain]
Debt Instrument [Line Items]
Debt, stated interest rate	3.70%
Long-term debt	$ 405,000	405,000
Ipalco Enterprises, Inc. [Member] | Four Point Two Five Percent Senior Secured Notes
Debt Instrument [Line Items]
Debt, stated interest rate	4.25%
Long-term debt	$ 475,000	475,000
First Mortgage Bonds [Member] | Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Deferred financing costs	$ (16,939)	$ (17,384)

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Apr. 14, 2020
Debt Instrument [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 200	$ 300	$ 500	$ 700
Long-term Debt	2,652,396		$ 2,652,396		$ 2,651,185
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			100.00%
Gain (Loss) on Extinguishment of Debt	0	(2,415)	$ 0	(2,415)	(2,400)
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			100.00%
Gain (Loss) on Extinguishment of Debt	0	$ 2,415	$ 0	$ 2,415	2,400
Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term Debt	1,780,931		1,780,931		1,780,410
Secured Debt	1,780,931		1,780,931		1,780,410
Subsidiaries [Member] | Three Point Eight Seven Five Percent First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Secured Debt	95,000		95,000
Subsidiaries [Member] | Aggregated Principal Amount of Environmental Facilities Refunding Revenue Bonds, Series 2021A&B
Debt Instrument [Line Items]
Secured Debt	95,000		95,000
Subsidiaries [Member] | Aggregated Principal Amount of First Mortgage Bonds to the Indiana Finance Authority in Two Series
Debt Instrument [Line Items]
Secured Debt	95,000		95,000
Subsidiaries [Member] | FMB Twenty - four
Debt Instrument [Line Items]
Secured Debt	$ 55,000		$ 55,000
Debt Instrument, Interest Rate, Stated Percentage	1.40%		1.40%
Subsidiaries [Member] | FMB Twenty - five
Debt Instrument [Line Items]
Secured Debt	$ 40,000		$ 40,000
Debt Instrument, Interest Rate, Stated Percentage	0.65%		0.65%
Parent Company [Member] | Three Point Four Five Percent Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 475,000		$ 475,000		475,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%		4.25%
Parent Company [Member] | Bank Term Loan Maturing July 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt						$ 65,000
Parent Company [Member] | Three Point Seven Zero Percent Senior Secured Notes [Domain]
Debt Instrument [Line Items]
Long-term Debt	$ 405,000		$ 405,000		405,000
Debt Instrument, Interest Rate, Stated Percentage	3.70%		3.70%
Line of Credit [Member] | Committed Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit, outstanding borrowings	$ 100,000		$ 100,000		$ 75,000

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
State and federal income tax rate	20.70%	21.30%	20.60%	21.30%
Effective Income Tax Rate Reconciliation, at Combined Federal and State Statutory Income Tax Rate, Percent			25.01%

Benefit Plans (Narrative) (Deta

Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Postretirement Health Care Benefits [Member] | Subsidiaries [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded obligation	$ 4.4	$ 4.3

Benefit Plans (Schedule Of Defi

Benefit Plans (Schedule Of Defined Benefit Plans Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Unfunded Status of Plans [Roll Forward]
Service cost	$ (2,335)	$ (2,068)	$ (4,669)	$ (4,136)
Interest cost	(3,915)	(5,538)	(7,830)	(11,076)
Expected return on assets	10,454	9,445	20,908	18,890
Regulatory Assets Related to Pensions [Roll Forward]
Amortization of prior service cost	(736)	(919)	(1,472)	(1,838)
Defined Benefit Plan, Amortization of Gain (Loss)	$ (1,382)	$ (2,028)	$ (2,764)	$ (4,057)

Benefit Plans (Schedule Of Net

Benefit Plans (Schedule Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 2,335	$ 2,068	$ 4,669	$ 4,136
Interest cost	3,915	5,538	7,830	11,076
Expected return on assets	(10,454)	(9,445)	(20,908)	(18,890)
Amortization of prior service cost	736	919	1,472	1,838
Amortization of actuarial loss	1,382	2,028	2,764	4,057
Net periodic benefit cost	$ (2,086)	$ 1,108	$ (4,173)	$ 2,217

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	1 Months Ended
	Oct. 31, 2009coal_fired_electric_generating_facility	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Entity Information [Line Items]
Payment of Civil Penalties		$ 1,525
Environmental Mitigation Project Costs		5,000
Environmentally Beneficial Project Expenditure		325
Total Legal Loss Contingencies Accrued		$ 13,400	$ 13,400
Indianapolis Power And Light Company [Member]
Entity Information [Line Items]
Number of facilities with violations of Federal Clean Air Act | coal_fired_electric_generating_facility	3

Business Segment Information (D

Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	$ 4,505	$ 5,165	$ 14,540	$ 14,937
Net Income (Loss) Attributable to Parent	17,210	19,123	55,994	55,106
UTILITY OPERATING REVENUES	330,587	311,503	692,788	668,885
Depreciation and amortization	62,994	61,099	126,083	121,807
Interest Expense	32,199	33,935	62,266	64,016
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	21,715	24,288	70,534	70,043
Property, Plant and Equipment, Additions			132,341	92,848
Assets	4,994,205	4,969,919	4,994,205	4,969,919	$ 4,969,919
Interest Rate Cash Flow Hedge Liability at Fair Value	46,015		46,015
Electric [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	62,994	61,099	126,083	121,807
Interest Expense	21,255	21,882	42,776	43,802
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	32,587	38,770	89,882	93,737
Property, Plant and Equipment, Additions			132,341	92,848
Assets	4,975,344	4,952,408	4,975,344	4,952,408
Other Segments [Member]
Segment Reporting Information [Line Items]
UTILITY OPERATING REVENUES	0	0	0	0
Depreciation and amortization	0	0	0	0
Interest Expense	10,944	12,053	19,490	20,214
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(10,872)	(14,482)	(19,348)	(23,694)
Property, Plant and Equipment, Additions			0	0
Assets	18,861	17,511	18,861	17,511
Electricity [Member]
Segment Reporting Information [Line Items]
UTILITY OPERATING REVENUES	$ 330,587	$ 311,503	$ 692,788	$ 668,885

Revenue (Details)

Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, before Allowance for Credit Loss	$ 149,800		$ 149,800		$ 163,800
Revenue from Contract with Customer, Excluding Assessed Tax	318,500	$ 302,400	672,200	$ 654,300
REVENUES	330,587	311,503	692,788	668,885
Contract with Customer, Liability	0		0		$ 500
Contract with Customer, Liability, Revenue Recognized	200	300	500	700
Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	310,916	295,570	645,753	633,463
Other non-606 revenue	11,710	8,789	19,305	13,684
Wholesale Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,918	4,501	21,027	15,809
Miscellaneous revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,692	2,329	5,373	5,061
Other non-606 revenue	351	314	1,330	868
Electricity [Member]
Disaggregation of Revenue [Line Items]
REVENUES	330,587	311,503	692,788	668,885
Utility | Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,175	2,805	8,366	6,693
Utility | Retail Revenue [Member] | Residential Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	129,254	127,752	289,757	283,161
Utility | Retail Revenue [Member] | Small Commercial and Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	48,208	43,402	102,725	97,655
Utility | Retail Revenue [Member] | Large Commercial and Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	127,009	119,302	240,449	241,340
Utility | Retail Revenue [Member] | Public Lighting
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,270	$ 2,309	$ 4,456	$ 4,614

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Lease Income	$ 300	$ 200	$ 600	$ 500
Lessor, Operating Lease, Payment to be Received, Year One	443		443
Lessor, Operating Lease, Payment to be Received, Year Two	903		903
Lessor, Operating Lease, Payment to be Received, Year Three	906		906
Lessor, Operating Lease, Payment to be Received, Year Four	786		786
Lessor, Operating Lease, Payment to be Received, Year Five	553		553
Lessor, Operating Lease, Payment to be Received, after Year Five	2,113		2,113
Lessor, Operating Lease, Payments to be Received	5,704		5,704
Lessor, Operating Lease, Assumptions and Judgments, Value of Underlying Asset, Amount	4,600		4,600		$ 4,300
Property Subject to or Available for Operating Lease, Accumulated Depreciation	$ 1,000		$ 1,000		$ 800