Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities [Abstract]

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

The following tables provide information on gains or losses recognized in AOCI for the cash flow hedges for the period indicated:

	Interest Rate Hedges for the Six Months Ended June 30, 2019
$ in thousands (net of tax)
Beginning accumulated derivative gain / (loss) in AOCI	$	—
Net gains / (losses) associated with current period hedging transactions	(17,188		)
Ending accumulated derivative gain / (loss) in AOCI	$	(17,188	)
Portion expected to be reclassified to earnings in the next twelve months (a)	$	—
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)	13

Schedule of Derivative Instruments [Table Text Block]

At June 30, 2019, IPL's outstanding derivative instruments were as follows:

Commodity	Accounting Treatment (a)	Unit	Purchases (in thousands)		Sales (in thousands)		Net Purchases/(Sales) (in thousands)
Interest rate hedges	Designated	USD	$	400,000	$	—	$	400,000
FTRs	Not Designated	MWh	13,646		—		13,646

(a) Refers to whether the derivative instruments have been designated as a cash flow hedge.