Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UTILITY OPERATING REVENUES	$ 1,349,588	$ 1,347,430	$ 1,250,399
UTILITY OPERATING EXPENSES:
Fuel	281,542	276,171	315,600
Other operating expenses	253,496	244,660	223,717
Power purchased	189,847	170,466	145,064
Maintenance	129,734	130,385	131,574
Depreciation and amortization	208,204	218,444	188,267
Taxes other than income taxes	44,580	45,262	43,617
Income taxes - net	65,621	73,161	57,284
Total utility operating expenses	1,173,024	1,158,549	1,105,123
UTILITY OPERATING INCOME	176,564	188,881	145,276
OTHER INCOME AND (DEDUCTIONS):
Allowance for equity funds used during construction	25,798	27,140	15,302
Loss on early extinguishment of debt	(8,875)	0	(21,956)
Miscellaneous income and (deductions) - net	(234)	(2,311)	(2,994)
Income tax benefit applicable to nonoperating income	16,670	11,952	25,718
Total other income and (deductions) - net	33,359	36,781	16,070
INTEREST AND OTHER CHARGES:
Interest on long-term debt	117,162	111,611	106,936
Other interest	2,068	2,710	2,628
Allowance for borrowed funds used during construction	(22,302)	(23,866)	(12,809)
Amortization of redemption premiums and expense on debt	4,202	4,147	5,067
Total interest and other charges - net	101,130	94,602	101,822
NET INCOME	108,793	131,060	59,524
LESS: PREFERRED DIVIDENDS OF SUBSIDIARY	3,213	3,213	3,213
NET INCOME APPLICABLE TO COMMON STOCK	105,580	127,847	56,311
Indianapolis Power And Light Company [Member]
UTILITY OPERATING REVENUES	1,349,588	1,347,430	1,250,399
UTILITY OPERATING EXPENSES:
Fuel	281,542	276,171	315,600
Other operating expenses	253,496	244,660	223,717
Power purchased	189,847	170,466	145,064
Maintenance	129,734	130,385	131,574
Depreciation and amortization	208,204	218,444	188,267
Taxes other than income taxes	44,580	45,262	43,617
Income taxes - net	65,621	73,161	57,284
Total utility operating expenses	1,173,024	1,158,549	1,105,123
UTILITY OPERATING INCOME	176,564	188,881	145,276
OTHER INCOME AND (DEDUCTIONS):
Allowance for equity funds used during construction	25,798	27,140	15,302
Miscellaneous income and (deductions) - net	(537)	(1,354)	(2,019)
Income tax benefit applicable to nonoperating income	30	460	1,066
Total other income and (deductions) - net	25,291	26,246	14,349
INTEREST AND OTHER CHARGES:
Interest on long-term debt	83,375	77,638	65,277
Other interest	2,068	2,710	2,628
Allowance for borrowed funds used during construction	(22,302)	(23,866)	(12,809)
Amortization of redemption premiums and expense on debt	2,199	2,200	2,608
Total interest and other charges - net	65,340	58,682	57,704
NET INCOME	136,515	156,445	101,921
LESS: PREFERRED DIVIDENDS OF SUBSIDIARY	3,213	3,213	3,213
NET INCOME APPLICABLE TO COMMON STOCK	$ 133,302	$ 153,232	$ 98,708