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Rate Matters (Tables)
9 Months Ended
Sep. 30, 2014
Public Utilities, General Disclosures [Abstract]  
SPS' Texas 2014 Electric Rate Case
Although the parties to the settlement agreement have not prepared a calculation of the $37 million increase and do not agree about which specific costs are included, or not, in the agreed settlement revenue requirement, SPS’ reconciliation of its original request to the settlement increase is as follows:
(Millions of Dollars)
 
Settlement Agreement
Base rate increase request, January 2014
 
$
81.5

Revisions for updated information
 
(4.6
)
Revised request, April 2014
 
76.9

Remove proposed increase in depreciation
 
(16.0
)
Remove adjustment allocators for certain wholesale load reduction
 
(12.0
)
Revised amortizations (rate case expenses, pension and other post-employment benefits expense and gain on sale to Lubbock)
 
(9.0
)
Non-specified settlement adjustments
 
(2.9
)
Settlement base rate increase
 
$
37.0