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REGULATION - REGULATORY FILINGS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Schedule of Regulatory [Line Items]  
Increase (decrease) in regulatory assets and liabilities $ 9.8
SAFE-Safety Acceleration and Facility Enhancement Program [Member]
  
Schedule of Regulatory [Line Items]  
Capital investments approved by the board of public utilities 130
Weighted cost of capital 6.90%
Public utility annual rate for allowance for funds used during construction 6.90%
AIP I and AIP II [Member]
  
Schedule of Regulatory [Line Items]  
Annual recovery amount increase (decrease) proposed to the board of public utilities 6.9
Annual recovery amount proposed to the public utility regulatory authority $ 15.8