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REGULATION - REGULATORY FILINGS (Details) (USD $)
6 Months Ended 3 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Mar. 31, 2013
SAFE-Safety Acceleration and Facility Enhancement Program [Member]
Mar. 31, 2013
AIP I and AIP II [Member]
Mar. 31, 2013
Deferred Superstorm Storm Costs [Member]
Sep. 30, 2012
Deferred Superstorm Storm Costs [Member]
Schedule of Regulatory [Line Items]            
Increase (decrease) in regulatory assets and liabilities $ 9,800,000          
Capital investments approved by the board of public utilities     130,000,000      
Weighted cost of capital     6.90%      
Public utility annual rate for allowance for funds used during construction     6.90%      
Regulatory assets 442,208,000 441,263,000     14,666,000 0
Annual recovery amount increase (decrease) proposed to the board of public utilities       $ 6,900,000