Contingencies and Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of Recovery Balance of Each Regulatory Clause

The recovery balance of each regulatory clause follows:

Regulatory Clause	Balance Sheet Line Item	March 31, 2015		December 31, 2014
		(in millions)
Rate CNP Compliance – Under*	Deferred under recovered regulatory clause revenues	$	25	$	2
	Under recovered regulatory clause revenues, current	16		47
Rate CNP PPA – Under	Deferred under recovered regulatory clause revenues	62		29
	Under recovered regulatory clause revenues, current	—		27
Retail Energy Cost Recovery – Over	Deferred over recovered regulatory clause revenues	81		47
Natural Disaster Reserve	Other regulatory liabilities, deferred	82		84

* Formerly Known As Rate CNP Environmental

Recovery Position of Each Regulatory Clause

The recovery balance of each regulatory clause follows:

Recovery Clause	Balance Sheet Location	March 31, 2015		December 31, 2014
		(in millions)
Fuel Cost Recovery – Under	Under recovered regulatory clause revenues	$	32	$	40
Purchased Power Capacity Recovery – Under	Under recovered regulatory clause revenues	3		—
Environmental Cost Recovery – Under	Under recovered regulatory clause revenues	12		10
Energy Conservation Cost Recovery – Under	Under recovered regulatory clause revenues	1		3

Current And Actual Cost Estimate for Kemper IGCC

Mississippi Power's Kemper IGCC 2010 project estimate, current cost estimate (which includes the impacts of the Mississippi Supreme Court's (Court) decision), and actual costs incurred as of March 31, 2015, as adjusted for the Court's decision, are as follows:

Cost Category	2010 Project Estimate(f)		Current Estimate		Actual Costs at March 31, 2015
	(in billions)
Plant Subject to Cost Cap(a)	$	2.40	$	4.94	$	4.37
Lignite Mine and Equipment	0.21		0.23		0.23
CO2 Pipeline Facilities	0.14		0.11		0.10
AFUDC(b)(c)	0.17		0.64		0.48
Combined Cycle and Related Assets Placed in Service – Incremental(d)	—		0.02		—
General Exceptions	0.05		0.10		0.08
Deferred Costs(c)(e)	—		0.18		0.14
Total Kemper IGCC(a)(c)	$	2.97	$	6.22	$	5.40

(a) The 2012 MPSC CPCN Order approved a construction cost cap of up to $2.88 billion, net of the DOE Grants and excluding the Cost Cap Exceptions. The Current Estimate and Actual Costs include non-incremental operating and maintenance costs related to the combined cycle and associated common facilities placed in service in August 2014 that are subject to the $2.88 billion cost cap and exclude post-in-service costs for the lignite mine. See "Rate Recovery of Kemper IGCC Costs – 2013 MPSC Rate Order" for additional information.

(b) Mississippi Power's original estimate included recovery of financing costs during construction rather than the accrual of AFUDC. This approach was not approved by the Mississippi PSC in 2012 as described in "Rate Recovery of Kemper IGCC Costs." The current estimate includes an approximately $9 million increase in AFUDC related to a settlement agreement with the wholesale customers for cost-based rates under FERC's jurisdiction. See "FERC Matters" herein for additional information.

(c) Amounts in the Current Estimate reflect estimated costs through March 31, 2016.

(d) Incremental operating and maintenance costs related to the combined cycle and associated common facilities placed in service in August 2014, net of costs related to energy sales. See "Rate Recovery of Kemper IGCC Costs – 2013 MPSC Rate Order" for additional information.

(e) The 2012 MPSC CPCN Order approved deferral of non-capital Kemper IGCC-related costs during construction as described in "Rate Recovery of Kemper IGCC Costs – Regulatory Assets and Liabilities."

(f) The 2010 Project Estimate is the certificated cost estimate adjusted to include the certificatedestimate for the CO₂ pipeline facilities which was approved in 2011 by the Mississippi PSC.