Choose your state
Our products and services differ based on state. Please select your state (or the state you're interested in) from the list to the left.
Why do our products and services differ based on state? Because our business is regulated by state. We have regulated operations in eight Western and Midwestern states. The different regulatory body for each state we serve determines what products and services we deliver in that state.
Open Access Transmission Tariff (OATT)
Open Access Transmission Tariff (OATT)
Tariffs and formula rate matters
Current Tariffs
The main Open Access Transmission Tariff (OATT) document below covers our entire service area. All files can be viewed using Acrobat Reader. Note the large file sizes may have long download times.
Pending Tariff Filings
- 05-10-2013 PSCo Order 1000 Interregional Current Tariff
- 4-24-2013 PSCO WestConnect Remove Term Filing
- 11-1-2012 PSCo Yearly FP2P Rate Filing
- 10-11-2012 PSCo-SPS-Order 1000 Comp Filing
- 09-19-2012-PSC0 Lamar Tie Revisions Filing
- 8-31-2012- SPS Line Losses Settlement Agreement Filing
- 07-25-2012 - Return on Equity (ROE) Filing (lower ROE to 10.25%)
- 07-19-2012 - Transmission to Load Interconnection Filing
- 05-01-2012 - SPS Line Losses Filing
- 04-20-2012 - PSCo Trans Rate Case Filing
Formula Rate Matters
- PSCO 2012 PBOP filing
- NSP Companies Attachment O with 2011 Actuals and Supporting Work Papers
- 12-2012 - NSP Companies Attachment O Attachment GG and Attachment MM Effective January 1, 2013 to December 31,2013
- 12-2012 Attachment O- SPS 2013 Formula Rate Annual Update (Excel Spreadsheet)
- 11-2012 ---SPS RLS for 2013 Annual Update Rv1
- 11-2012---SPS 2011 Transmission Formula Rate True-up Adjustment Rv2
- 11-2012 ---SPS RLS for 2011 True-Up Rv3
- 11-2012---Attachment O-SPS 2013 Formula Rate Annual Update Rvs1
- 11-2012---SPS Customer Meeting Question Responses
- Sec. 2 a (i) Transmission Formula 2013 Estimated Rates
- Sec. 2 a (ii) Schedule I Support- 2013 Forecasted Transmission Peak
- Sec. 2 a (ii) WP B-2 & 3 Support- Electric Non Plant ADIT 2013
- Sec. 2 a (ii) WP B-3 Support NOL Carry Forward Backup Calculation
- Sec. 2 a (ii) WP B-4 Support Calpine Acq Adj.
- Sec. 2a (ii) WP B-Inputs JUR Version 75 PSCo 2013 Budget
- Sec. 2 a (ii) WP B Inputs Support OMS Adjustment
- Sec. 2 a (ii) WP B- Inputs Support- CRS Adjustment
- Sec. 2a (ii) WP B- Inputs Support Smart Grid City Adjustment
- Sec. 2a (ii) WP B- Inputs Support- Bill Redesign (CRS)
- Sec. 2a (iii) Material Accounting Changes-2012 PSCo
- Sec. 2a (V) Common Allocation Study 2011
- Sec. 2a (ii) WP C-1 Support MPB Summary
- Sec. 2a (ii) WP C-4 Support Rate Case Expenses
- Sec. 2a (iv) 2013 Capital Additions
- 10-2012 --- SPS RLS for 2013 Annual Update (Excel spreadsheet)
- 10-2012---Attachment O-SPS 2012 Disclosure of Material Accounting Changes
- 10-2012---Attachment O-SPS 2013 Formula Rate Annual Update
- 10-2012---Attachment O-SPS 2013 Formula Rate Annual Update (Excel spreadsheet)
- 10-2012---Attachment O-SPS 2013 Transmission Formula Supporting Documentation.
- 10-2012---Attachment O-SPS Variance Analysis Projected 2013 vs 2012
- 10-2012---Attachment O-SPS Variance Analysis Projected 2013 vs 2012( Excel spreadsheet)
- 09-2012--PSCO Rates Effective July 1, 2011
- 09-2012--PSCO Rates Effective June 1, 2012
- 08-2012 - SPS RLS for 2011 True-Up
- 08-2012 - SPS-2011 Transmission Formula Rate True-up Adjustment
- 08-2012 - Customer Meeting Attachment 1-4
- 08-2012 - Customer Meeting Attachment 1-9
- 08-2012 - SPS Customer Meeting Responses
- 08-2012 - SPS RLS for 2011 True-Up
- 07-2012 - Attachment GG True-Up
- 06-2012 - Customer Meeting Notice for 2011 True-Up
- 06-2012 - SPS2011 True-up Disclosure of Material Accounting Changes
- 06-2012 - SPS RLS for 2011 True-Up (Excel spreadsheet)
- 06-2012 - SPS Variance Analysis for 2011 True-Up (Excel spreadsheet)
- 06-2012 - SPS Variance Analysis for 2011 True-Up
- 06-2012 - SPS Supporting Documentation for 2011 True-Up
- 06-2012 - SPS Notice of Availability of 2011 True-up
- 06-2012 - SPS2011 Transmission Formula Rate True-up Adjustment (Excel spreadsheet)
- 06-2012 - SPS2011_Transmission Formula Rate True-up Adjustment
- NSP Companies Attachment O 2011 Actuals and Supporting Workpapers
- 04-2012- PSCo Attachment O Transmission Formula -2011
- NSP Companies Attachment O, Attachment GG and Attachment MM Effective January 1, 2012 to December 31
- 12-2011 - NSP Attachment O 2010 Actual Costs and Supporting Work Papers Rev.2
- 12-2011 - Attachment O-SPS Transmission Formula Info Filing Transmittal
- 12-2011 - SPS RLS for 2010 True-Up
- 12-2011 - SPS 2010 Transmission Formula Rate True-Up Adjustment
- 12-2011 - SPS 2010 Transmission Formula Rate True-Up Adjustment (Excel spreadsheet)
- 12-2011 - Attachment O-SPS 2012 Formula Rate Annual Update (Excel spreadsheet)
- 12-2011 - Attachment O-SPS 2012 Formula Rate Annual Update
- 12-2011 - Attachment O-SPS Variance Analysis Projected 2012 vs 2011
- 10-2011 - AttachO-SPS 2012 Formula Rate Annual Update
- 10-2011 - AttachO-SPS 2012 Formula Rate Annual Update (Excel Spreadsheet)
- 10-2011 - Attachment O-SPS 2012 Disclosure of Material Accounting Changes
- 10-2011 - Attachment O-SPS 2012 Transmission Formula Supporting Documentation
- 10-2011 - Attachment O-SPS Variance Analysis Projected 2012 vs 2011
- 10-2011 - SPS RLS for 2012 Annual Update (Excel Spreadsheet)
- 09-2011 - SPS 2010 Transmission Formula Rate True-Up Adjustment (Excel Spreadsheet)
- 09-2011 - SPS TransFormula Customer Mtg Responses 2nd Set
- 09-2011 - SPS 2010 Transmission Formula Rate True-Up Adjustment
- 09-2011 - Customer Meeting Attachment 2-1
- 07-2011 - Customer Meeting Attachment 1-2
- 07-2011 - Customer Meeting Attachment 1-3
- 07-2011 - Customer Meeting Attachment 1-9
- 07-2011 - SPS TransFormula Customer Meeting Responses
- 07-2011 - Attachment GG-2010 True-Up Notice
- 06-2011 - SPS Customer Meeting Notice for 2010 True-Up
- 06-2011 - SPS RLS for 2010 True-Up (Excel Spreadsheet)
- 06-2011 - SPS RLS for 2010 True-Up Part 1.
- 06-2011 - SPS RLS for 2010 True-Up Part 2
- 06-2011 - SPS RLS for 2010 True-Up Part 3
- 06-2011 - SPS Notice of Availability of 2010 True-Up
- 06-2011 - SPS 2010 True-Up Disclosure of Material Accounting Changes.
- 06-2011 - SPS Variance Analysis for 2010 True-Up
- 06-2011 - SPS Variance Analysis for 2010 True-Up (Excel spreadsheet)
- 06-2011 - SPS 2010 Transmission Formula Rate True-Up Adjustment
- 06-2011 - SPS 2010 Transmission Formula Rate True-Up Adjustment (spreadsheet)
- 06-2011 - Supporting Documentation for 2010 True-Up Rates
- 05-2011 - PSCo Rates Effective June 1, 2011
- 03-2011 - SPS Transmission Formula Annual Update Informational Filing Transmittal Letter
- 03-2011 - SPS Transmission Formula Attachment O
- 03-2011 - SPS Transmission Formula Attachment O XLS
- 03-2011 - Modification to Attachment C for Flow Limited Paths
- 12-2010 - SPS Response to GSEC Preliminary Challenge to 2009 Trueup 2011 Projected Rates
- 12-2010 - GSEC-SPS Preliminary Challenge (a)
- 12-2010 - GSEC-SPS Preliminary Challenge (b)
- 12-2010 - GSEC-SPS Preliminary Challenge (c)
- 12-2010 - GSEC-SPS Preliminary Challenge (d)
- 12-2010 - SPS Transmission Formula Rate Annual Update Informational Filing Transmittal Letter
- 12-2010 - SPS GSEC Preliminary Challenge 2009 Trueup 2011 Projected Formula Rate
- 10-2010 - SPS Attachment O Filing
- 10-2010 - NSP MISO Attachment O 2009 Actuals and Supporting Workpapers
- 10-2010 - SPS RLS Baseline 2009 True-Up 2011 Estimate Posted XLS
- 10-2010 - Attachment O-SPS Variance Analysis Projected 2011 vs 2010
- 10-2010 - Att O-SPS 2011 Transmission Formula Supporting Documentation
- 10-2010 - Att O-SPS 2011 Transmission Formula Rate Annual Update
- 10-2010 - Att O-SPS 2009 Transmission Formula Rate True Up (Rev.2RLS2009.B2 Study)
- 10-2010 - AttachmentO-SPS2011Transmission Formula Rate Annual Update(Rev.0) XLS
- 10-2010 - Att O-SPS 2009Transmission Formula RateT-U(Rev.2RLS2009.B-2Study) XLS
- 08-2010 - NSP Transmission Service Rate 1/1/11 - 12/21/11
- 07-2010 - Attachment GG 2009 True-Up Notice
- 07-2010 - PSCo Rates Effective June 1, 2010 (Rev. 1)
- 06-2010 - SPS 2009 True-Up Disclosure of Material Accounting Changes
- 06-2010 - SPS 2009 True-Up Disclosure of Material Accounting Changes XLS
- 06-2010 - SPS 2009 Formula RateTrue-Up Adjustment
- 06-2010 - SPS 2009 Transmission Formula Rate True-Up Adjustment XLS
- 06-2010 - SPS Variance Analysis for 2009 True-Up XLS
- 06-2010 - SPS Variance Analysis for 2009 True-Up
- 06-2010 - Supporting Documentation for 2009 True-Up Rates
- 05-2010 - PSCo Rates Effective June 1, 2010
- 03-2010 - Attachment O- PSCo Filing Under March 2010
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