Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
UTILITY PLANT:
Utility plant in service	$ 5,385,053	$ 4,997,846
Less accumulated depreciation	2,129,617	2,030,497
Utility plant in service - net	3,255,436	2,967,349
Construction work in progress	711,396	898,330
Spare parts inventory	13,157	14,237
Property held for future use	1,002	1,002
Utility plant - net	3,980,991	3,880,918
OTHER ASSETS:
Nonutility property - at cost, less accumulated depreciation	502	512
Intangible Assets, Net (Excluding Goodwill)	16,036	11,976
Other long-term assets	6,185	5,916
Other assets - net	22,723	18,404
CURRENT ASSETS:
Cash and cash equivalents	30,681	34,953
Accounts receivable and unbilled revenue (less allowance for doubtful accounts of $2,076 and $1,982, respectively)	157,577	154,586
Fuel inventories - at average cost	32,393	30,237
Materials and supplies - at average cost	63,623	60,648
Regulatory assets	35,341	33,912
Prepayments and other current assets	34,094	33,504
Total current assets	353,709	347,840
DEFERRED DEBITS:
Regulatory assets	378,904	450,710
Miscellaneous	4,234	4,409
Total deferred debits	383,138	455,119
TOTAL	4,740,561	4,702,281
Common shareholders' equity:
Paid in capital	597,467	596,810
Accumulated deficit	(25,191)	(25,627)
Total common shareholders' equity	572,276	571,183
Cumulative preferred stock of subsidiary	59,784	59,784
Long-term debt	2,477,538	2,474,840
Total capitalization	3,109,598	3,105,807
CURRENT LIABILITIES:
Short-term debt	148,000	74,650
Accounts payable	125,297	119,511
Accrued expenses	27,926	18,754
Accrued real estate and personal property taxes	18,145	18,930
Regulatory liabilities	2,532	7,704
Accrued interest	34,332	32,541
Customer deposits	31,306	29,780
Other current liabilities	10,392	19,467
Total current liabilities	397,930	321,337
DEFERRED CREDITS AND OTHER LONG-TERM LIABILITIES:
Regulatory liabilities	851,754	670,294
Deferred income taxes - net	245,257	449,730
Non-current income tax liability	4,651	6,634
Unamortized investment tax credit	954	2,410
Accrued pension and other postretirement benefits	50,070	64,139
Asset retirement obligations	79,535	80,568
Miscellaneous	812	1,362
Total deferred credits and other long-term liabilities	1,233,033	1,275,137
TOTAL	4,740,561	4,702,281
Indianapolis Power And Light Company [Member]
UTILITY PLANT:
Utility plant in service	5,385,053	4,997,846
Less accumulated depreciation	2,129,617	2,030,497
Utility plant in service - net	3,255,436	2,967,349
Construction work in progress	711,396	898,330
Spare parts inventory	13,157	14,237
Property held for future use	1,002	1,002
Utility plant - net	3,980,991	3,880,918
OTHER ASSETS:
Intangible Assets, Net (Excluding Goodwill)	16,036	11,976
Other Assets	1,630	1,263
Other assets - net	17,666	13,239
CURRENT ASSETS:
Cash and cash equivalents	12,342	26,607
Accounts receivable and unbilled revenue (less allowance for doubtful accounts of $2,076 and $1,982, respectively)	157,577	154,586
Fuel inventories - at average cost	32,393	30,237
Materials and supplies - at average cost	63,624	60,649
Regulatory assets	35,341	33,912
Prepayments and other current assets	36,475	31,497
Total current assets	337,752	337,488
DEFERRED DEBITS:
Regulatory assets	378,904	450,710
Miscellaneous	4,234	4,409
Total deferred debits	383,138	455,119
TOTAL	4,719,547	4,686,764
Common shareholders' equity:
Common stock	324,537	324,537
Paid in capital	599,157	598,500
Accumulated deficit	442,779	434,993
Total common shareholders' equity	1,366,473	1,358,030
Cumulative preferred stock of subsidiary	59,784	59,784
Long-term debt	1,675,935	1,675,131
Total capitalization	3,102,192	3,092,945
CURRENT LIABILITIES:
Short-term debt	148,000	74,650
Accounts payable	125,162	119,506
Accrued expenses	27,046	18,742
Accrued real estate and personal property taxes	18,145	18,930
Regulatory liabilities	2,532	7,704
Accrued Income Taxes, Current	0	984
Accrued interest	22,486	22,731
Customer deposits	31,306	29,780
Other current liabilities	10,092	26,167
Total current liabilities	384,769	319,194
DEFERRED CREDITS AND OTHER LONG-TERM LIABILITIES:
Regulatory liabilities	851,754	670,294
Deferred income taxes - net	244,812	449,220
Non-current income tax liability	4,651	6,634
Unamortized investment tax credit	954	2,410
Accrued pension and other postretirement benefits	50,070	64,139
Asset retirement obligations	79,535	80,568
Miscellaneous	810	1,360
Total deferred credits and other long-term liabilities	1,232,586	1,274,625
TOTAL	$ 4,719,547	$ 4,686,764