v3.26.1
Overview and Summary Of Significant Accounting Policies (Policies)
 3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]  
Consolidation, Policy [Policy Text Block]
Consolidation
 
The accompanying Financial Statements include the accounts of IPALCO Enterprises, Inc., AES Indiana and Mid-America Capital Resources, Inc., a non-regulated wholly-owned subsidiary of IPALCO. Furthermore, VIEs in which the Company has an ownership interest and is the primary beneficiary, thus controlling the VIE, as described below, have been consolidated. All significant intercompany amounts have been eliminated in consolidation.
Consolidated VIEs

At March 31, 2026, AES Indiana consolidates a number of entities that have been identified as VIEs under ASC 810, Consolidation. These entities are primarily limited liability entities structured to develop and construct renewable generation and energy storage facilities and related assets. These entities were generally determined to have insufficient equity to finance their activities during development and construction without additional subordinated financial support. AES Indiana also has tax equity arrangements entered into with third parties in order to monetize certain tax credits associated with renewables facilities. These tax equity partnerships meet the definition of a VIE as the holders of the membership interests, as a group, lack the characteristics of a controlling financial interest, including substantive kickout rights. Under these arrangements, the third-party investors are allocated earnings, tax attributes, and distributable cash in accordance with the respective limited liability company agreements. The assets of these tax equity partnerships are restricted from transfer under the terms of their limited liability company agreements. The third-party investor’s ownership interest is recorded as either “Redeemable stock of subsidiaries” or “Noncontrolling interests” in the Consolidated Balance Sheets based on applicable guidance. See Note 9, “Equity - Equity Transactions with Noncontrolling Interests” for further information.

Determining whether AES Indiana is the primary beneficiary of a VIE requires judgment, including an assessment of contractual rights, operational responsibilities, and exposure to variability in returns. AES Indiana is considered the primary beneficiary of these VIEs when it has the power to direct the activities that most significantly affect their economic performance, such as construction, budgeting, operations, and maintenance, and it has the obligation to absorb expected losses and the right to receive benefits through its variable interests.

At March 31, 2026 and December 31, 2025, the assets of these VIEs were approximately $1,695.6 million and $1,488.7 million, primarily consisting of property, plant and equipment, construction work in progress and other non-current assets. At March 31, 2026 and December 31, 2025, the liabilities of these VIEs were approximately $330.7 million and $276.4 million, primarily consisting of finance leases and accounts payable.
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 reported within the Condensed Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Condensed Consolidated Statements of Cash Flows:
 March 31,December 31,
 20262025
 (In Thousands)
Cash, cash equivalents and restricted cash
     Cash and cash equivalents$94,150 $69,834 
     Restricted cash (included in Prepayments and other current assets)5 5 
          Total cash, cash equivalents and restricted cash$94,155 $69,839 
Receivable [Policy Text Block]
Accounts Receivable and Allowance for Credit Losses

The following table summarizes our accounts receivable balances at March 31, 2026 and December 31, 2025:
 March 31,December 31,
 20262025
 (In Thousands)
Accounts receivable, net
     Customer receivables$175,785 $184,471 
     Unbilled revenue
82,175 94,875 
     Amounts due from related parties12,078 8,533 
     Other13,843 22,394 
     Allowance for credit losses(13,049)(14,057)
           Total accounts receivable, net$270,832 $296,216 
Schedule of Asset Retirement Obligations [Table Text Block]
Three Months Ended March 31,
 20262025
 (In Thousands)
Balance as of January 1
$573,187 $378,460 
Liabilities incurred— 250 
Liabilities settled(3,405)(1,987)
Revisions to cash flow and timing estimates(4,589)(12,919)
Accretion expense6,363 4,475 
Balance as of March 31$571,556 $368,279 
Less: ARO liabilities, current60,190 45,396 
ARO liabilities, non-current
$511,366 $322,883 
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:
Three Months Ended March 31,
$ in Thousands20262025
Allowance for credit losses:
     Beginning balance$14,057 $29,798 
     Current period provision4,042 6,579 
     Write-offs charged against allowance
(5,321)(192)
     Recoveries
271 269 
           Ending Balance$13,049 $36,454