Regulatory Assets And Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Entity Information [Line Items]

Schedule Of Regulatory Assets And Liabilities

The amounts of regulatory assets and regulatory liabilities at December 31 are as follows:

	2017		2016		Recovery Period
	(In Thousands)
Regulatory Assets
Current:
Undercollections of rate riders	$	22,990	$	19,959	Approximately 1 year(1)
Costs being recovered through base rates	12,351		13,953		Approximately 1 year(1)
Total current regulatory assets	35,341		33,912
Long-term:
Unrecognized pension and other
postretirement benefit plan costs	205,573		218,070		Various(2)
Deferred income taxes recoverable through rates	—		51,131		Various
Deferred MISO costs	101,562		114,359		Through 2026(3)
Unamortized Petersburg Unit 4 carrying
charges and certain other costs	9,139		10,193		Through 2026(1)(4)
Unamortized reacquisition premium on debt	21,109		22,501		Over remaining life of debt
Environmental projects	40,434		30,678		Through 2050(1)(4)
Other miscellaneous	1,087		3,778		To be determined(1)(5)
Total long-term regulatory assets	378,904		450,710
Total regulatory assets	$	414,245	$	484,622
Regulatory Liabilities
Current:
Overcollections of rate riders	$	—	$	3,311	Approximately 1 year(1)
FTRs	2,532		4,393		Approximately 1 year(1)
Total current regulatory liabilities	2,532		7,704
Long-term:
ARO and accrued asset removal costs	696,973		668,787		Not Applicable
Deferred income taxes payable through rates	154,461		—		Various
Unamortized investment tax credit	320		1,507		Through 2021
Total long-term regulatory liabilities	851,754		670,294
Total regulatory liabilities	$	854,286	$	677,998

(1) Recovered (credited) per specific rate orders

(2) IPL receives a return on its discretionary funding

(3) The majority of these costs are being recovered per specific rate order; recovery for the remaining costs is probable but timing not yet determined

(4) Recovered with a current return

Indianapolis Power And Light Company [Member]

Entity Information [Line Items]

Schedule Of Regulatory Assets And Liabilities

The amounts of regulatory assets and regulatory liabilities at December 31 are as follows:

	2017			2016		Recovery Period
	(In Thousands)
Regulatory Assets
Current:
Undercollections of rate riders	$	22,990	8,002	$	19,959	Approximately 1 year(1)
Costs being recovered through base rates	12,351			13,953		Approximately 1 year(1)
Total current regulatory assets	35,341			33,912
Long-term:
Unrecognized pension and other
postretirement benefit plan costs	205,573			218,070		Various(2)
Deferred income taxes recoverable through rates	—			51,131		Various
Deferred MISO costs	101,562			114,359		Through 2026(3)
Unamortized Petersburg Unit 4 carrying
charges and certain other costs	9,139			10,193		Through 2026(1)(4)
Unamortized reacquisition premium on debt	21,109			22,501		Over remaining life of debt
Environmental projects	40,434			30,678		Through 2050(1)(4)
Other miscellaneous	1,087			3,778		To be determined(1)(5)
Total long-term regulatory assets	378,904			450,710
Total regulatory assets	$	414,245		$	484,622
Regulatory Liabilities
Current:
Overcollections of rate riders	$	—		$	3,311	Approximately 1 year(1)
FTRs	2,532			4,393		Approximately 1 year(1)
Total current regulatory liabilities	2,532			7,704
Long-term:
ARO and accrued asset removal costs	696,973			668,787		Not Applicable
Deferred income taxes payable through rates	154,461			—		Various
Unamortized investment tax credit	320			1,507		Through 2021
Total long-term regulatory liabilities	851,754			670,294
Total regulatory liabilities	$	854,286		$	677,998

(1) Recovered (credited) per specific rate orders

(2) IPL receives a return on its discretionary funding

(3) The majority of these costs are being recovered per specific rate order; recovery for the remaining costs is probable but timing not yet determined

(4) Recovered with a current return

(5) A portion of this amount will be recovered over the next two years