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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 20202019
 (In Thousands)
Change in benefit obligation:  
Projected benefit obligation at January 1$782,795 $697,228 
Service cost8,272 7,412 
Interest cost22,151 27,343 
Actuarial loss/(gain)66,827 88,311 
Amendments (primarily increases in pension bands)967 — 
Benefits paid(38,487)(37,499)
Projected benefit obligation at December 31842,525 782,795 
Change in plan assets:  
Fair value of plan assets at January 1769,704 684,485 
Actual return on plan assets118,716 122,690 
Employer contributions87 28 
Benefits paid(38,487)(37,499)
Fair value of plan assets at December 31850,020 769,704 
Funded (unfunded) status$7,495 $(13,091)
Amounts recognized in the statement of financial position:  
Non-current assets $8,669 $— 
Non-current liabilities(1,174)(13,091)
Net amount recognized at end of year$7,495 $(13,091)
Sources of change in regulatory assets(1):
  
Prior service cost arising during period$967 $— 
Net (gain)/loss arising during period(14,110)(4,472)
Amortization of prior service cost(3,677)(3,823)
Amortization of loss(8,115)(11,084)
Total recognized in regulatory assets$(24,935)$(19,379)
Amounts included in regulatory assets:  
Net loss$145,526 $167,750 
Prior service cost11,613 14,323 
Total amounts included in regulatory assets$157,139 $182,073 
Information For Pension Plans With A Benefit Obligation In Excess Of Plan Assets
 Pension benefits
as of December 31,
 20202019
 (In Thousands)
Benefit obligation$842,525 $782,795 
Plan assets850,020 769,704 
Benefit obligation in excess of plan assets$(7,495)$13,091 
Information For Pension Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets
 Pension benefits
as of December 31,
 20202019
 (In Thousands)
Accumulated benefit obligation$830,458 $771,592 
Plan assets850,020 769,704 
Accumulated benefit obligation in excess of plan assets$(19,562)$1,888 
Schedule Of Net Periodic Benefit Costs
 Pension benefits for
years ended December 31,
 202020192018
 (In Thousands)
Components of net periodic benefit cost:   
Service cost$8,272 $7,412 $8,450 
Interest cost22,151 27,343 25,220 
Expected return on plan assets(37,779)(29,907)(40,801)
Amortization of prior service cost3,677 3,823 3,837 
Recognized actuarial loss8,115 11,084 11,403 
Recognized settlement loss— — 1,230 
Total pension cost4,436 19,755 9,339 
Less: amounts capitalized372 1,237 1,223 
Amount charged to expense$4,064 $18,518 $8,116 
Rates relevant to each year’s expense calculations:   
Discount rate – defined benefit pension plan3.33 %4.36 %3.67 %
Discount rate – supplemental retirement plan3.05 %4.24 %3.60 %
Expected return on defined benefit pension plan assets5.05 %4.50 %5.45 %
Expected return on supplemental retirement plan assets4.45 %4.50 %5.45 %
Schedule Of Asset Allocation Guidelines
The following table summarizes the Company’s target pension plan allocation for 2020:
Asset Category:Target Allocations
Equity Securities36%
Debt Securities64%
Schedule Of Fair Value Of Pension Plan Assets
 Fair Value Measurements at
December 31, 2020
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Cash and cash equivalents$2,221 $2,221 $— — %
Government debt securities118,255 131 118,124 14 %
Mutual fund - equities323,253 2,839 320,414 38 %
Mutual fund - debt406,291 1,578 404,713 48 %
Total$850,020 $6,769 $843,251 100 %
 Fair Value Measurements at
December 31, 2019
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Cash and cash equivalents$2,599 $2,599 $— — %
Government debt securities154,798 39 154,759 20 %
Mutual fund - equities214,369 2,744 211,625 28 %
Mutual fund - debt397,938 1,664 396,274 52 %
Total(1)
$769,704 $7,046 $762,658 100 %
Schedule Of Expected Benefit Payments Expected benefit payments are expected to be paid out of the Pension Plans as follows:
YearPension Benefits
 (In Thousands)
2021$41,552 
202242,715 
202343,371 
202443,827 
202544,467 
2026 through 2030224,933 
Indianapolis Power And Light Company  
Entity Information [Line Items]  
Schedule Of Defined Benefit Plans Disclosures
 Pension benefits
as of December 31,
 20202019
 (In Thousands)
Change in benefit obligation:  
Projected benefit obligation at January 1$782,795 $697,228 
Service cost8,272 7,412 
Interest cost22,151 27,343 
Actuarial loss/(gain)66,827 88,311 
Amendments (primarily increases in pension bands)967 — 
Benefits paid(38,487)(37,499)
Projected benefit obligation at December 31842,525 782,795 
Change in plan assets:  
Fair value of plan assets at January 1769,704 684,485 
Actual return on plan assets118,716 122,690 
Employer contributions87 28 
Benefits paid(38,487)(37,499)
Fair value of plan assets at December 31850,020 769,704 
Funded (unfunded) status$7,495 $(13,091)
Amounts recognized in the statement of financial position:  
Non-current assets$8,669 $— 
Non-current liabilities(1,174)(13,091)
Net amount recognized at end of year$7,495 $(13,091)
Sources of change in regulatory assets(1):
  
Prior service cost arising during period$967 $— 
Net (gain)/loss arising during period(14,110)(4,472)
Amortization of prior service cost(3,677)(3,823)
Amortization of loss(8,115)(11,084)
Total recognized in regulatory assets$(24,935)$(19,379)
Amounts included in regulatory assets:  
Net loss$145,526 $167,750 
Prior service cost11,613 14,323 
Total amounts included in regulatory assets$157,139 $182,073 
Information For Pension Plans With A Benefit Obligation In Excess Of Plan Assets
 Pension benefits
as of December 31,
 20202019
 (In Thousands)
Benefit obligation$842,525 $782,795 
Plan assets850,020 769,704 
Benefit obligation in excess of plan assets$(7,495)$13,091 
Information For Pension Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets
 Pension benefits
as of December 31,
 20202019
 (In Thousands)
Accumulated benefit obligation$830,458 $771,592 
Plan assets850,020 769,704 
Accumulated benefit obligation in excess of plan assets$(19,562)$1,888 
Schedule Of Net Periodic Benefit Costs
 Pension benefits for
years ended December 31,
 202020192018
 (In Thousands)
Components of net periodic benefit cost:   
Service cost$8,272 $7,412 $8,450 
Interest cost22,151 27,343 25,220 
Expected return on plan assets(37,779)(29,907)(40,801)
Amortization of prior service cost3,677 3,823 3,837 
Recognized actuarial loss8,115 11,084 11,403 
Recognized settlement loss— — 1,230 
Total pension cost4,436 19,755 9,339 
Less: amounts capitalized372 1,237 1,223 
Amount charged to expense$4,064 $18,518 $8,116 
Rates relevant to each year’s expense calculations:   
Discount rate – defined benefit pension plan3.33 %4.36 %3.67 %
Discount rate – supplemental retirement plan3.05 %4.24 %3.60 %
Expected return on defined benefit pension plan assets5.05 %4.50 %5.45 %
Expected return on supplemental retirement plan assets4.45 %4.50 %5.45 %
Schedule Of Asset Allocation Guidelines
Asset Category:Target Allocations
Equity Securities36%
Debt Securities64%
Schedule Of Fair Value Of Pension Plan Assets
 Fair Value Measurements at
December 31, 2020
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Cash and cash equivalents$2,221 $2,221 $— — %
Government debt securities118,255 131 118,124 14 %
Mutual fund - equities323,253 2,839 320,414 38 %
Mutual fund - debt406,291 1,578 404,713 48 %
Total$850,020 $6,769 $843,251 100 %
 Fair Value Measurements at
December 31, 2019
(in thousands)
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable Inputs 
Asset CategoryTotal(Level 1)(Level 2)%
Cash and cash equivalents$2,599 $2,599 $— — %
Government debt securities154,798 39 154,759 20 %
Mutual fund - equities214,369 2,744 211,625 28 %
Mutual fund - debt397,938 1,664 396,274 52 %
Total(1)
$769,704 $7,046 $762,658 100 %
Schedule Of Expected Benefit Payments
YearPension Benefits
 (In Thousands)
2021$41,552 
202242,715 
202343,371 
202443,827 
202544,467 
2026 through 2030224,933