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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
9 Months Ended12 Months Ended9 Months Ended1 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2005
state
phase
Dec. 31, 2010
Sep. 30, 2011
SCE&G
Nuclear electric generation units
nuclearunit
MW
May 31, 2011
SCE&G
Mar. 31, 2011
SCE&G
year
Sep. 30, 2011
SCE&G
scenarios
M
site
Sep. 30, 2011
PSNC Energy
site
Nuclear Insurance        
Federal limit on public liability claims from nuclear incident, approximate$ 12,600,000,000       
Maximum liability assessment per reactor for each nuclear incident117,500,000     78,300,000 
Maximum yearly assessment per reactor17,500,000     11,700,000 
Proportionate ownership share in Summer Station Unit 1      two-thirds 
Proportionate ownership share of the other owner in Summer Station Unit 1      one-third 
Maximum retrospective insurance premium per nuclear incident      14,200,000 
Environmental        
Number of states required to reduce emissions to attain mandated levels 28      
Number of phases set by CAIR to attain emission limit 2      
Maximum number of years required to meet the new standards for mercury and other specified air pollutants     4  
Number of sites decommissioned that contain residues of by-product chemicals      4 
Additional costs incurred for remediation      8,600,000 
Initial demand for costs and damages relating to a MGP site in South Carolina      9,100,000 
Settlement amount    3,750,000   
Deferred costs, net of costs previously recovered through rates and insurance settlements included in regulatory assets      25,200,000 
Number of sites that require environmental clean-up       5
Regulatory assets1,192,000,000 1,061,000,000    3,200,000
Nuclear Generation        
Number of nuclear electric generation units   2    
Generation capacity (in MW)   1,117    
Percentage applicable to the Company (as a percent)   55.00%    
Percentage applicable to joint owner 2 (as a percent)   45.00%    
Estimated cash outflow for plant costs and related transmission infrastructure costs of nuclear electric generation site   $ 5,500,000,000    
Basis for determination of the projected plant costs and related transmission infrastructure costs   one-year and five-year escalation rates    
Number of scenarios analyzed under earthquake impact study      3 
Extension in commercial operation date (in months)      6