Utility Plant In Service (Tables)

12 Months Ended

Dec. 31, 2017

Entity Information [Line Items]

Schedule Of Original Cost Of Utility Plant In Service

	As of December 31,
	2017		2016
	(In Thousands)
Production	$	3,249,563	$	2,923,349
Transmission	380,881		376,659
Distribution	1,487,380		1,433,044
General plant	267,229		264,794
Total utility plant in service	$	5,385,053	$	4,997,846

Reconciliation Of Asset Retirement Obligation Liability

The following is a reconciliation of the ARO legal liability year end balances:

	2017			2016
	(In Millions)
Balance as of January 1	$	80.6		$	59.0
Liabilities incurred	—			—
Liabilities settled	(5.3		)	(3.2		)
Revisions in estimated cash flows	—			21.6
Accretion expense	4.2			3.2
Balance as of December 31	$	79.5		$	80.6

Indianapolis Power And Light Company [Member]

Entity Information [Line Items]

Schedule Of Original Cost Of Utility Plant In Service

	As of December 31,
	2017		2016
	(In Thousands)
Production	$	3,249,563	$	2,923,349
Transmission	380,881		376,659
Distribution	1,487,380		1,433,044
General plant	267,229		264,794
Total utility plant in service	$	5,385,053	$	4,997,846

Reconciliation Of Asset Retirement Obligation Liability

The following is a reconciliation of the ARO legal liability year end balances:

	2017			2016
	(In Millions)
Balance as of January 1	$	80.6		$	59.0
Liabilities incurred	—			—
Liabilities settled	(5.3		)	(3.2		)
Revisions in estimated cash flows	—			21.6
Accretion expense	4.2			3.2
Balance as of December 31	$	79.5		$	80.6