Asset Retirement Obligations

6 Months Ended

Jun. 30, 2015

Asset Retirement Obligation [Abstract]

Certain costs of removal that have been, and continue to be, included in depreciation rates and collected in the service rates of the rate-regulated subsidiaries are classified as “Regulatory liabilities” on the Condensed Consolidated Balance Sheets (unaudited).

Changes in NiSource’s liability for asset retirement obligations for the six months ended June 30, 2015 and 2014 are presented in the table below:



(in millions)	2015			2014
Balance as of January 1,	$	159.4		$	174.4
Accretion expense	0.6			0.8
Accretion recorded as a regulatory asset/liability	3.9			4.2
Additions	7.6			3.0
Settlements	(1.2		)	(1.0		)
Change in estimated cash flows⁽¹⁾	34.4			(3.4		)
Balance as of June 30,	$	204.7		$	178.0

⁽¹⁾ The change in estimated cash flows is primarily attributable to estimated costs to comply with the EPA's final rule for regulation of CCRs and changes to cost estimates for certain solid waste management units. Refer to Note 17-C for additional information on CCRs.