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Contingencies and Regulatory Matters Current And Actual Cost Estimates (Tables)
 12 Months Ended
Dec. 31, 2013
Loss Contingencies [Line Items]  
Current cost estimate and actual costs incurred
Mississippi Power’s 2010 project estimate, current cost estimate, and actual costs incurred as of December 31, 2013 for the Kemper IGCC are as follows:
Cost Category
2010 Project Estimate(d)
Current Estimate
Actual Costs at 12/31/2013
 
(in billions)
Plant Subject to Cost Cap(a)
$
2.40

$
4.06

$
3.25

Lignite Mine and Equipment
0.21
0.23
0.23
CO2 Pipeline Facilities
0.14
0.11
0.09
AFUDC(b)
0.17
0.45
0.28
General Exceptions
0.05
0.10
0.07
Regulatory Asset(c)
—

0.09
0.07
Total Kemper IGCC(a)
$
2.97

$
5.04

$
3.99

(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.
(b)
Mississippi Power’s original estimate included recovery of financing costs during construction which was not approved by the Mississippi PSC in June 2012 as described in "Rate Recovery of Kemper IGCC Costs."
(c)
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."
(d)
The 2010 Project Estimate is the certificated cost estimate adjusted to include the certificated estimate for the CO2 pipeline facilities which was approved in 2011 by the Mississippi PSC.
Mississippi Power [Member]
  
Loss Contingencies [Line Items]  
Current cost estimate and actual costs incurred
The Company's 2010 project estimate, current cost estimate, and actual costs incurred as of December 31, 2013 for the Kemper IGCC are as follows:
Cost Category
2010 Project Estimate(d)
Current Estimate
Actual Costs at 12/31/2013
 
(in billions)
Plant Subject to Cost Cap(a)
$
2.40

$
4.06

$
3.25

Lignite Mine and Equipment
0.21
0.23
0.23
CO2 Pipeline Facilities
0.14
0.11
0.09
AFUDC(b)
0.17
0.45
0.28
General Exceptions
0.05
0.10
0.07
Regulatory Asset(c)
—

0.09
0.07
Total Kemper IGCC(a)
$
2.97

$
5.04

$
3.99

(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.
(b)
The Company’s original estimate included recovery of financing costs during construction which was not approved by the Mississippi PSC in June 2012 as described in "Rate Recovery of Kemper IGCC Costs."
(c)
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."
(d)
The 2010 Project Estimate is the certificated cost estimate adjusted to include the certificated estimate for the CO2 pipeline facilities which was approved in 2011 by the Mississippi PSC.