Regulatory assets and liabilities include the following:



	March 31, 2013		December 31, 2012
(millions)
Dominion
Regulatory assets:
Deferred rate adjustment clause costs⁽¹⁾	$	59	$	55
Unrecovered gas cost⁽²⁾	27		59
Deferred cost of fuel used in electric generation⁽³⁾	17		—
Other	74		89
Regulatory assets-current⁽⁴⁾	177		203
Unrecognized pension and other postretirement benefit costs⁽⁵⁾	1,192		1,210
Deferred rate adjustment clause costs⁽¹⁾	181		173
Income taxes recoverable through future rates⁽⁶⁾	149		140
Derivatives⁽⁷⁾	85		105
Other	89		89
Regulatory assets-non-current	1,696		1,717
Total regulatory assets	$	1,873	$	1,920
Regulatory liabilities:
PIPP⁽⁸⁾	$	118	$	100
Other	29		36
Regulatory liabilities-current⁽⁹⁾	147		136
Provision for future cost of removal and AROs⁽¹⁰⁾	1,005		985
Decommissioning trust⁽¹¹⁾	575		501
Other	66		28
Regulatory liabilities-non-current	1,646		1,514
Total regulatory liabilities	$	1,793	$	1,650
Virginia Power
Regulatory assets:
Deferred rate adjustment clause costs⁽¹⁾	$	58	$	51
Deferred cost of fuel used in electric generation⁽³⁾	17		—
Other	70		68
Regulatory assets-current⁽⁴⁾	145		119
Deferred rate adjustment clause costs⁽¹⁾	130		127
Income taxes recoverable through future rates⁽⁶⁾	118		110
Derivatives⁽⁷⁾	85		105
Other	55		54
Regulatory assets-non-current	388		396
Total regulatory assets	$	533	$	515
Regulatory liabilities:
Other	$	19	$	32
Regulatory liabilities-current⁽⁹⁾	19		32
Provision for future cost of removal⁽¹⁰⁾	780		763
Decommissioning trust⁽¹¹⁾	575		501
Other	59		21
Regulatory liabilities-non-current	1,414		1,285
Total regulatory liabilities	$	1,433	$	1,317


(1)	Reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects. See Note 12 for more information.


(2)	Reflects unrecovered gas costs at Dominion's regulated gas operations, which are recovered through quarterly or annual filings with the applicable regulatory authority.


(3)	Primarily reflects deferred fuel expenses for the Virginia jurisdiction of Virginia Power's generation operations.


(4)	Current regulatory assets are presented in other current assets in Dominion's and Virginia Power's Consolidated Balance Sheets.


(5)	Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered through future rates generally over the expected remaining service period of plan participants by certain of Dominion's rate-regulated subsidiaries.


(6)	Amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC-equity and depreciation of property, plant and equipment for which deferred income taxes were not recognized for ratemaking purposes, including amounts attributable to tax rate changes.


(7)	For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers.


(8)	Under PIPP, eligible customers can receive energy assistance based on their ability to pay. The difference between the customer's total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rider according to East Ohio tariff provisions.


(9)	Current regulatory liabilities are presented in other current liabilities in Dominion's and Virginia Power's Consolidated Balance Sheets.


(10)	Rates charged to customers by the Companies' regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.


(11)	Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power's utility nuclear generation stations, in excess of the related AROs.