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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Entity Information [Line Items]  
Schedule Of Defined Benefit Plans Disclosures
The following table presents information relating to the Pension Plans: 
 Pension benefits
as of December 31,
 20232022
 (In Thousands)
Change in benefit obligation:  
Projected benefit obligation at January 1$577,530 $772,040 
Service cost5,189 8,949 
Interest cost29,818 18,099 
Actuarial loss (gain)9,681 (182,590)
Amendments (primarily increases in pension bands)653 — 
Settlements— (394)
Benefits paid(73,325)(38,575)
Projected benefit obligation at December 31549,546 577,529 
Change in plan assets:  
Fair value of plan assets at January 1611,125 820,684 
Actual return/(loss) on plan assets52,905 (171,002)
Employer contributions114 412 
Settlements— (394)
Benefits paid(73,325)(38,575)
Fair value of plan assets at December 31590,819 611,125 
Funded status$41,273 $33,596 
Amounts recognized in the statement of financial position:  
Non-current assets $41,273 $33,611 
Non-current liabilities— (15)
Net amount recognized at end of year$41,273 $33,596 
Sources of change in regulatory assets(1):
  
Prior service cost arising during period$653 $— 
Net (gain)/loss arising during period(10,117)24,069 
Amortization of prior service cost(2,172)(2,589)
Amortization of loss(6,145)(2,622)
Total recognized in regulatory assets$(17,781)$18,858 
Amounts included in regulatory assets:  
Net loss$115,297 $131,559 
Prior service cost10,136 11,655 
Total amounts included in regulatory assets$125,433 $143,214 
Schedule Of Net Periodic Benefit Costs
 Pension benefits for
years ended December 31,
 202320222021
 (In Thousands)
Components of net periodic benefit cost / (credit):   
Service cost$5,189 $8,949 $9,339 
Interest cost29,818 18,099 15,660 
Expected return on plan assets(33,107)(35,656)(41,815)
Amortization of prior service cost2,172 2,589 2,944 
Amortization of actuarial loss6,145 2,424 5,529 
Amortization of settlement loss— 199 — 
Net periodic benefit cost / (credit)10,217 (3,396)(8,343)
Less: amounts capitalized1,689 (316)(771)
Amount charged to expense$8,528 $(3,080)$(7,572)
Rates relevant to each year’s expense calculations:   
Discount rate – defined benefit pension plan5.41 %2.83 %2.46 %
Discount rate – supplemental retirement plan5.32 %2.62 %2.31 %
Expected return on defined benefit pension plan assets5.60 %4.45 %5.05 %
Expected return on supplemental retirement plan assets6.45 %5.50 %3.60 %
Schedule Of Asset Allocation Guidelines
The following table summarizes the Company’s target pension plan allocation for 2023:
Asset Category:Target Allocations
Equity Securities13.5%
Debt Securities86.5%
Schedule Of Fair Value Of Pension Plan Assets
 Fair Value Measurements at
December 31, 2023
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Common collective trusts:
     Equities (a)
$82,652 $2,267 $80,385 14 %
     Debt securities (b)
387,979 1,168 386,811 66 %
     Government debt securities (c)
117,397 178 117,219 20 %
Total common collective trusts588,028 3,613 584,415 100 %
     Cash and cash equivalents (d)
2,791 2,791 — — %
Total pension plan assets$590,819 $6,404 $584,415 100 %

(a) This category represents investments that invest in equity securities of U.S. companies of any market capitalization and other investments (i.e.: futures, swaps, currency forwards) of foreign, emerging markets and seeks to provide long-term total return, which includes capital appreciation and income. The funds are valued using the net asset value method.

(b) This category represents investments that invest in high quality issues within the U.S. corporate bond markets and global high yield bonds and emerging markets debt denominated in local currency. The funds seek to provide current income and long-term capital preservation along with access to higher yielding, relatively liquid fixed income securities. The funds are valued using the net asset value method.

(c) This category represents investments that invest in U.S. treasury strips, U.S. government agency obligations, and U.S. treasury obligations. The funds seek investment returns over the long term and are valued using the net asset value method.

(d) This category represents an investment that seeks to maximize current income on cash reserves to the extent consistent with principal preservation and maintenance of liquidity from a portfolio of obligations of the U.S. Government, its agencies or municipalities, and related money market instruments. Principal preservation is a primary objective. The fund is valued at cost.
 Fair Value Measurements at
December 31, 2022
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Common collective trusts:
     Equities (a)
$85,341 $2,017 $83,324 14 %
     Debt securities (b)
400,291 1,254 399,037 66 %
     Government debt securities (c)
122,704 420 122,284 20 %
Total common collective trusts608,336 3,691 604,645 100 %
     Cash and cash equivalents (d)
2,789 2,789 — — %
Total pension plan assets$611,125 $6,480 $604,645 100 %
Schedule Of Expected Benefit Payments Benefit payments, which reflect future service, are expected to be paid out of the Pension Plans as follows:
YearPension Benefits
 (In Thousands)
2024$37,997 
202538,794 
202639,665 
202740,085 
202841,477 
2029 through 2033200,574 
Indianapolis Power And Light Company  
Entity Information [Line Items]  
Schedule Of Defined Benefit Plans Disclosures
 Pension benefits
as of December 31,
 20232022
 (In Thousands)
Change in benefit obligation:  
Projected benefit obligation at January 1$577,530 $772,040 
Service cost5,189 8,949 
Interest cost29,818 18,099 
Actuarial loss (gain)9,681 (182,590)
Amendments (primarily increases in pension bands)653 — 
Settlements— (394)
Benefits paid(73,325)(38,575)
Projected benefit obligation at December 31549,546 577,529 
Change in plan assets:  
Fair value of plan assets at January 1611,125 820,684 
Actual return/(loss) on plan assets52,905 (171,002)
Employer contributions114 412 
Settlements— (394)
Benefits paid(73,325)(38,575)
Fair value of plan assets at December 31590,819 611,125 
Funded status$41,273 $33,596 
Amounts recognized in the statement of financial position:  
Non-current assets$41,273 $33,611 
Non-current liabilities— (15)
Net amount recognized at end of year$41,273 $33,596 
Sources of change in regulatory assets(1):
  
Prior service cost arising during period$653 $— 
Net (gain)/loss arising during period(10,117)24,069 
Amortization of prior service cost(2,172)(2,589)
Amortization of loss(6,145)(2,622)
Total recognized in regulatory assets$(17,781)$18,858 
Amounts included in regulatory assets:  
Net loss$115,297 $131,559 
Prior service cost10,136 11,655 
Total amounts included in regulatory assets$125,433 $143,214 
Schedule Of Net Periodic Benefit Costs
 Pension benefits for
years ended December 31,
 202320222021
 (In Thousands)
Components of net periodic benefit cost / (credit):   
Service cost$5,189 $8,949 $9,339 
Interest cost29,818 18,099 15,660 
Expected return on plan assets(33,107)(35,656)(41,815)
Amortization of prior service cost2,172 2,589 2,944 
Amortization of actuarial loss6,145 2,424 5,529 
Amortization of settlement loss— 199 — 
Net periodic benefit cost / (credit) 10,217 (3,396)(8,343)
Less: amounts capitalized1,689 (316)(771)
Amount charged to expense$8,528 $(3,080)$(7,572)
Rates relevant to each year’s expense calculations:   
Discount rate – defined benefit pension plan5.41 %2.83 %2.46 %
Discount rate – supplemental retirement plan5.32 %2.62 %2.31 %
Expected return on defined benefit pension plan assets5.60 %4.45 %5.05 %
Expected return on supplemental retirement plan assets6.45 %5.50 %3.60 %
Schedule Of Asset Allocation Guidelines
Asset Category:Target Allocations
Equity Securities13.5%
Debt Securities86.5%
Schedule Of Fair Value Of Pension Plan Assets
 Fair Value Measurements at
December 31, 2023
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
  Common collective trusts:
     Equities (a)
$82,652 $2,267 $80,385 14 %
     Debt securities (b)
387,979 1,168 386,811 66 %
     Government debt securities (c)
117,397 178 117,219 20 %
          Total common collective trusts588,028 3,613 584,415 100 %
     Cash and cash equivalents (d)
2,791 2,791 — — %
Total pension plan assets$590,819 $6,404 $584,415 100 %

(a) This category represents investments that invest in equity securities of U.S. companies of any market capitalization and other investments (i.e.: futures, swaps, currency forwards) of foreign, emerging markets and seeks to provide long-term total return, which includes capital appreciation and income. The funds are valued using the net asset value method.

(b) This category represents investments that invest in high quality issues within the U.S. corporate bond markets and global high yield bonds and emerging markets debt denominated in local currency. The funds seek to provide current income and long-term capital preservation along with access to higher yielding, relatively liquid fixed income securities. The funds are valued using the net asset value method.

(c) This category represents investments that invest in U.S. treasury strips, U.S. government agency obligations, and U.S. treasury obligations. The funds seek investment returns over the long term and are valued using the net asset value method.

(d) This category represents an investment that seeks to maximize current income on cash reserves to the extent consistent with principal preservation and maintenance of liquidity from a portfolio of obligations of the U.S. Government, its agencies or municipalities, and related money market instruments. Principal preservation is a primary objective. The fund is valued at cost.
 Fair Value Measurements at
December 31, 2022
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Common collective trusts:
     Equities (a)
$85,341 $2,017 $83,324 14 %
     Debt securities (b)
400,291 1,254 399,037 66 %
     Government debt securities (c)
122,704 420 122,284 20 %
          Total common collective trusts608,336 3,691 604,645 100 %
     Cash and cash equivalents (d)
2,789 2,789 — — %
Total pension plan assets$611,125 $6,480 $604,645 100 %
Schedule Of Expected Benefit Payments
YearPension Benefits
 (In Thousands)
2024$37,997 
202538,794 
202639,665 
202740,085 
202841,477 
2029 through 2033200,574