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Organization, Summary of Significant Accounting Policies and Recent Developments (Tables)
 12 Months Ended
Dec. 31, 2017
Organization Summary Of Significant Accounting Policies And Recent Developments [Abstract]  
Range of depreciation rates

The following table sets forth the range of depreciation rates for the major utility plant categories used to calculate depreciation for the years ended December 31, 2017, 2016 and 2015. These rates have been approved by the NJBPU, DEPSC or PAPUC:

 

Source of Supply 1.15% -   3.44% Transmission and Distribution (T&D):
Pumping 2.00% -   5.39% T&D – Mains 1.10%  -   3.13%
Water Treatment 1.65% -   7.09% T&D – Services 2.12%  -   3.16%
General Plant 2.08% - 17.84% T&D – Other 1.61%  -   4.63%
Wastewater Collection 1.42% -   1.81%    

 
Allowance for Funds Used During Construction Rates

The AFUDC rates for the years ended December 31, 2017, 2016 and 2015 for Middlesex and Tidewater are as follows:

 

  2017 2016 2015
Middlesex 6.73% 6.73% 6.72%
Tidewater 7.92% 7.92% 7.92%