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Property Plant and Equipment (Tables)
12 Months Ended
Sep. 30, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment comprise the following categories at September 30:
 
2012
 
2011
Distribution
$
2,047,780

 
$
1,951,889

Transmission
85,430

 
83,419

General and other, including construction in process
162,459

 
165,713

Total property, plant and equipment
$
2,295,669

 
$
2,201,021