Loss factors archive
-
Methodology
50% Area Load Methodology Using Corrected Loss Matrix
In the 50% Area Load Methodology Using Corrected Loss Matrix, the loss factors are determined directly from the coefficients of a system loss matrix which is derived from the system topology. The system loss matrix ‘R’ is also known as the real component of Z-bus Matrix. Each individual term of the loss matrix ‘R’ is corrected and the corrections are based on bus voltages, bus angles, and generator and load power factors obtained from the base-case load flow solutions.
In the ‘area load’ method, the generator for which the loss factor is being determined is designated as the swing generator, and load is changed at every bus in the area by a constant ratio. For this calculation the area is selected to be the entire Alberta system. Again loss factor is calculated equal to the change in losses for the resultant change in generation at the swing bus.
It can be shown mathematically that the losses assigned by the area load adjustment methodology are twice the actual losses. The loss factors calculated using area load adjustment is reduced by 50% to determine the average losses and unassigned losses and the shift factor will be recalculated. One single transmission raw loss factor number is determined which is derived from the average of the 12 seasonal scenarios.
Each year, the total system losses (energy) are estimated prospectively using the most current information available. The corresponding losses that would result from the application of the raw loss factors are also determined. An algorithm is used to shift all raw loss factors up or down until the two total loss volumes match. The amount of shift necessary becomes the annual 'shift factor’. The new adjusted raw loss factors are called normalized loss factors.
According to the Transmission Regulation the normalized loss factors should not exceed +12% or -12%. A linear compression algorithm with clipping is used to bring all loss factors within the given bandwidth. Compression will not be required if all normalized loss factors are within the limits as prescribed.
The links below provide a detailed description of the AESO's methodology. For more information on loss factors methodology, please contact the AESO at lossfactor@aeso.ca
Effective until December 31, 2008
- Loss Factor Methodologies Evaluation, Clarification to Part 4 Determination of Opportunity Service 'Raw' Loss Factors
[Posted: May 4, 2006] - Loss Factor Methodologies Evaluation Part 4 - Determination of Opportunity Service 'Raw' Loss Factors (Final)
[Posted: March 27, 2006] - Loss Factor Methodologies Evaluation Part 3 - Loss Factor Compression (Final)
[Posted: March 27, 2006] - Loss Factor Methodologies Evaluation Part 2 - Conversion of Power to Energy Loss Factors (Final)
[Posted: March 27, 2006] - Loss Factors Methodologies Evaluation Part 1 - Determination of 'Raw' Loss Factors and Load Flow Shift Factors (Full Document)
[Posted: June 1, 2007] - Loss Factors Methodologies Evaluation Part 1 - Determination of 'Raw' Loss Factors and Load Flow Shift Factors (New Pages)
[Posted: June 1, 2007] - 2006 Transmission Loss Factor Methodology - Decision Document
[Posted: October 20, 2005]
Effective from January 1, 2009
- Loss Factor Calculation Methodology - Effective January 01, 2009
[Posted: January 7, 2009]
- Loss Factor Methodologies Evaluation, Clarification to Part 4 Determination of Opportunity Service 'Raw' Loss Factors
-
Generic stacking order
2016 actual generic stacking order
- 2016 Loss Factors Generic Stacking Order[Posted: November 13, 2015]
- Updated Transmission Loss Factor GSO Data Confirmation for 2016[Posted: October 13, 2015]
- Updated 2016 Generic Stacking Order Draft Version[Posted: October 13, 2015]
- Transmission Loss Factor GSO Data Confirmation for 2016[Posted: August 11, 2015]
- 2016 Generic Stacking Order Draft Version[Posted: August 11, 2015]
2015 actual generic stacking order
- Updates to 2015 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by April 30, 2015[Posted: May 29, 2015]
- 2015 Loss Factors Generic Stacking Order[Posted: October 9, 2014]
- Transmission Loss Factor GSO Data Confirmation for 2015[Posted: August 25, 2014]
- 2015 Generic Stacking Order Draft Version[Posted: August 25, 2014]
2014 actual generic stacking order
- Updates to 2014 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by October 1, 2014[Posted: October 30, 2014]
- Updates to 2014 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by May 1, 2014[Posted: May 30, 2014]
- 2014 Loss Factors Generic Stacking Order[Posted: October 10, 2013]
- Updated Transmission Loss Factor Generator and Import Data Confirmation for 2014 (September 3, 2013)[Posted: September 3, 2013]
- Transmission Loss Factor GSO Data Confirmation for 2014 (September 3, 2013)[Posted: September 3, 2013]
- 2014 Generic Stacking Order Draft Version (September 3, 2013)[Posted: September 3, 2013]
- Transmission Loss Factor GSO Data Confirmation for 2014 (September 3, 2013)[Posted: August 20, 2013]
- 2014 Generic Stacking Order Draft Version [Posted: August 20, 2013]
2013 actual generic stacking order
- EXCEL file - Updates to 2013 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by September 17, 2013[Posted: February 19, 2015]
- Updates to 2013 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by September 17, 2013[Posted: September 30, 2013]
- Updates to 2013 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by June 10, 2013[Posted: June 27, 2013]
- Updates to 2013 Loss Factors Generic Stacking Order (GSO) Due to Updated Project Information Received by Feb 2013[Posted: February 28, 2013]
- Updates to 2013 Generic Stacking Order Due to Updated Project Information[Posted: November 2, 2012]
- Updates to 2013 Generic Stacking Order[Posted: October 15, 2012]
- 2013 Loss Factors Generic Stacking Order[Posted: September 26, 2012]
- Transmission Loss Factor GSO Data Confirmation for 2013[Posted: August 14, 2012]
- 2013 Generic Stacking Order Draft Version[Posted: August 14, 2012]
2012 actual generic stacking order
- Updates to 2012 Loss Factors Generic Stacking Order in Conjunction with Recalculated 2012 Loss Factors[Posted: July 30, 2012]
- Updates to 2012 Loss Factors Generic Stacking Order Due to Updated Project Information[Posted: March 28, 2012]
- Updates to 2012 Loss Factors Generic Stacking Order[Posted: November 3, 2011]
- 2012 Loss Factors Generic Stacking Order[Posted: September 16, 2011]
- Transmission Loss Factor GSO Data Confirmation for 2012[Posted: August 12, 2011]
- 2012 Generic Stacking Order Draft Version[Posted: August 12, 2011]
2011 forecast generic stacking order
- 2011 Generic Stacking Order Version 1 - July 5, 2007[Posted: July 11, 2011]
2011 actual generic stacking order
- 2011 Recalculated Loss Factors - Complete Updates to 2011 GSO[Posted: June 16, 2011]
- 2011 Recalculated Loss Factors - Updates to 2011 GSO[Posted: May 26, 2011]
- 2010-09-13 2011 Generic Stacking Order Loss Factors[Posted: September 13, 2010]
- 2010-08-06 2011 Generic Stacking Order Draft Version[Posted: August 6, 2010]
- 2010-08-06 Transmission Loss Factor GSO Data Confirmation for 2011[Posted: August 6, 2010]
2010 forecast generic stacking order
- 2010 Generic Stacking Order Version 1[Posted: September 28, 2005]
2010 actual generic stacking order
- 2010 Generic Stacking Order Loss Factors[Posted: September 3, 2009]
- 2010 Generic Stacking Order Loss Factors[Posted: August 19, 2009]
- 2009-07-13 Transmission Loss Factor GSO Data Confirmation for 2010[Posted: July 13, 2009]
- 2009-07-06 2010 Generic Stacking Order Draft Version[Posted: July 6, 2009]
2008 actual generic stacking order
- 2008 Generic Stacking Order Loss Factors – Updated on February 22, 2008[Posted: March 12, 2008]
- 2008 Generic Stacking Order Loss Factors – Updated on December 04, 2007[Posted: December 7, 2007]
- 2008 Generic Stacking Order Loss Factors - Updated on October 24, 2007[Posted: October 24, 2007]
- 2008 Generic Stacking Order Loss Factors[Posted: August 28, 2007]
2007 actual generic stacking order
- 2007 Generic Stacking Order[Posted: September 5, 2006]
- AESO 2007 Draft Generic Stacking Order[Posted: August 2, 2006]
- AESO 2007 Draft Generic Stacking Order - Supporting Documentation[Posted: August 2, 2006]
- 2006 - 2007 Generic Stacking Order Comparison[Posted: July 19, 2006]
2006 actual generic stacking order
- 2006 Generic Stacking Order Version 2[Posted: September 28, 2005]
- 2006 Generic Stacking Order[Posted: August 25, 2005]
- Draft supporting documentation for 2006 GSO for stakeholder comment by Aug. 16[Posted: August 10, 2005]
- H Values for the Calculation of Capacity Values and Loss Factors, 2006[Posted: July 20, 2005]
-
Forecasts
5th Year Loss Factors
Notice on Publishing 5th Year Loss factors [Posted: April 16, 2015]
2018 loss factors forecasts
- Summary of 2018 Loss Factor Estimates[Posted: March 31, 2014]
2017 loss factors forecasts
- Summary of 2017 Loss Factor Estimates[Posted: March 28, 2013]
- Stakeholder Letter: All-bus 2017 5th year loss factors[Posted: September 12, 2013]
- All-bus 2017 5th year loss factors Scenario A[Posted: September 12, 2013]
- All-bus 2017 5th year loss factors Scenario B[Posted: September 12, 2012]
- All-bus 2017 5th year loss factors Scenario C[Posted: September 12, 2013]
- All-bus 2017 5th year loss factors Scenario D[Posted: September 12, 2013]
- All-bus 2017 5th year loss factors Scenario E[Posted: September 12, 2013]
2016 loss factors forecasts
- Summary of 2016 Loss Factor Estimates[Posted: March 29, 2012]
2015 loss factors forecasts
- Summary of 2015 Loss Factor Estimates[Posted: March 30, 2011]
2014 loss factors forecasts
- Summary of 2014 Loss Factor Estimates[Posted: March 29, 2010]
2013 loss factors forecasts
2012 loss factors forecasts
- Summary of 2012 Loss Factor Estimates[Posted: December 11, 2007]
2011 loss factors forecasts
- Summary of 2011 Loss Factor Estimates[Posted: September 5, 2007]
- New Delivery Date for the 2011 Loss Factors[Posted: November 28, 2006]
2010 loss factors forecasts
- 2010 Loss Factor Range - Supplement to February 27, 2006 Estimates[Posted: May 4, 2006]
- Summary of 2010 Loss Factor Estimates, Version 2[Posted: February 28, 2006]
- Summary of 2010 Loss Factor Estimates, Version 2[Posted: February 21, 2006]
- 2010 Non-Binding Loss Factors, Update[Posted: December 9, 2005]
-
Archives
2009 loss factors archive
- Notice to Stakeholders RE: Treatment of New Generators, Transmission Must Run Generation and DC Losses[Posted: December 11, 2009]
- 2009 Loss Factor Update
- Notice to Stakeholders - 2013 Loss Factors Estimates[Posted: April 30, 2009]
- Variance_Report_2006_20090204.pdf[Posted: May 6, 2009]
- Variance_Report_2007_20090204.pdf [Posted: May 6, 2009]
- 2009 and 2010 Loss Factor Update.pdf[Posted: May 13, 2009]
- Summary of 2008 Loss Factor Meeting Notes and Actions[Posted: June 17, 2009]
- Loss Factor Stakeholder Meeting - July 14, 2009[Posted: June 17, 2009]
- Change in Rider E Calculation Input Data[Posted: June 17, 2009]
- Response to July 29, 2009 TransCanada Pipelines Letter on 2010 GSO[Posted: August 20, 2009]
- Response to July 23, 2009 Milner Power Inc. Letter on 2010 GSO[Posted: September 3, 2009]
- Loss Factor Milestones Update for 2010 and 2014[Posted: September 30, 2009]
- Loss Factor Agenda for October 27 2009[Posted: October 21, 2009]
- Comments to the AESO from Milner Power Inc. following the October 27, 2009 Loss Factor Meeting.pdf[Posted: December 11, 2009]
- TransCanada letter of October 30, 2009 - 2010 Loss Factor Models - Draft Lost Factors[Posted: December 11, 2009]
- Summary of Meeting Notes and Actions - Loss Factor Meeting October 27, 2009[Posted: December 11, 2009]
- AESO Response to Milner Power Inc Letter on 2010 Loss Factors October 30 2009[Posted: December 11, 2009]
- AESO Response on TransCanada Letter of October 30, 2009 - 2010 Loss Factors[Posted: December 11, 2009]
- 2009 Loss Factor Update[Posted: January 22, 2009]
2008 loss factors archive
- TransCanada Comments to AESO and AESO Responses on Losses[Posted: November 6, 2008]
- Letter gso base case 2008 lf recalc 20080312[Posted: March 13, 2008]
- Voltage Profile in Loss Factor Base Cases - March 27, 2008 Meeting[Posted: March 19, 2008]
- Transmission Losses Assessment: 2007 Transmission Regulation and Stakeholder Consultation[Posted: March 25, 2008]
- Loss Factor Stakeholder Meeting, March 27, 2008 - Cancelled[Posted: March 25, 2008]
- 2008-04-11 Voltage Profile in Loss Factor Base Cases - TransCanada Final[Posted: April 16, 2008]
- Voltage Profile Improvement in Loss Factor Base Cases[Posted: April 29, 2008]
- Generic Stacking Order and Transmission Must Run Generation[Posted: May 13, 2008]
- Voltage Profile Improvement in Loss Factor Base Cases - Response to TransCanda Energy[Posted: June 3, 2008]
- Stakeholder Meeting - Milestones for Loss Factor Delivery, 2009[Posted: June 18, 2008]
- Summary of Meeting Notes and Actions - Loss Factor Meeting July 23, 2008[Posted: July 30, 2008]
- 2008-08-19 AESO Response to Milner Power Inc.[Posted: August 27, 2008]
- 2008-09-24 Revised Milestones for Loss Factor Delivery, 2009[Posted: September 25, 2008]
- Milner Comments to AESO on Losses[Posted: November 6, 2008]
- Loss Factor Stakeholder Meeting, March 27, 2008[Posted: February 27, 2008]
2007 loss factors archive
- Loss Factory Stakeholder Meeting December 7, 2007 Presentation - Understanding the Calculation Process[Posted: December 19, 2007]
- Changes to the Loss Factor Rule Related to the 2007 Transmission Regulation[Posted: July 16, 2007]
- 2007 Transmission Regulation – Loss Factor Comment Matrix and Discussion[Posted: July 13, 2007]
- Transmission Loss Factor Methodology and Assumptions - Appendix 7 (Draft for Discussion)[Posted: July 13, 2007]
- Rule-92 - Losses[Posted: July 13, 2007]
- Loss Factor Stakeholder Meeting, July 18, 2007 - Agenda[Posted: July 12, 2007]
- Draft Results of Loss Factors for 2007 Based on the New Transmission Regulation[Posted: June 19, 2007]
- AESO's Proposed Interpretation Input Matrix - Changes to the Loss Factor Rule Related to the 2007 Transmission Regulation[Posted: June 19, 2007]
- Follow-up - Loss Factors Meeting June 18, 2007[Posted: June 19, 2007]
- Stakeholder Input Matrix for Rule Changes[Posted: June 1, 2007]
- 2007 Loss Factors Milestones[Posted: June 1, 2007]
- Follow-up - Loss Factors Meeting May 30, 2007[Posted: June 1, 2007]
- 2007 Transmission Regulation: Changes and its Impact on Loss Factors[Posted: June 1, 2007]
- Agenda - Loss Factors Meeting May 30, 2007[Posted: May 17, 2007]
- Agenda - Loss Factor Stakeholder Meeting, May 30, 2007[Posted: May 15, 2007]
- 2007 Loss Factor Milestones[Posted: February 15, 2007]
- Loss Factor Discussion Paper - Preamble to Rule 9.2 and Appendix 7 Re: 2007 Regulation Change[Posted: July 27, 2007]
- AESO Rule 9.2 - Transmission Loss Factors[Posted: July 27, 2007]
- Transmission Loss Factor Methodology and Assumptions - Appendix 7[Posted: July 27, 2007]
- Calculation of Shift Factor[Posted: December 19, 2007]
- 2008 Loss Factor Base Cases and Results - TransCanada Energy Comments December 13, 2007[Posted: December 19, 2007]
- 2008 Loss Factor Base Cases and Results - TransCanada Energy Comments November 2, 2007[Posted: December 19, 2007]
- 2008 Loss Factor Base Cases and Results - TransCanada Energy Comments October 25, 2007[Posted: December 19, 2007]
- 2008 Loss Factor Base Cases and Results - HR Milner Comments October 25, 2007[Posted: December 19, 2007]
- 2008 Alberta Loss Factors based on 2007 T-REG[Posted: November 1, 2007]
- Summary of 2007 Loss Factor Meeting Notes and Actions[Posted: September 26, 2007]
- AESO Rule Consultation - Loss Factors Rule 9.2 and Appendix 7 (Oct 4/07 Presentation)[Posted: September 26, 2007]
- Inter Tie Activity, 2008 Loss Factors. Version 1, 2007-09-18[Posted: September 19, 2007]
- 2007 Transmission Regulation- Stakeholder request for input to Loss Factors Rules[Posted: August 23, 2007]
- Tie Losses Assessment for 2007 T-REG - DRAFT[Posted: August 9, 2007]
- Loss Factor Stakeholder Meeting Agenda - August 22, 2007[Posted: August 2, 2007]
- The 12 Raw Loss Factors Used to Determine the Final Loss Factor[Posted: July 31, 2007]
- Update on the Recalculation of 2007 Loss Factors using the 2007 Regulation[Posted: July 31, 2007]
- July 18 Meeting Notes Attachment[Posted: July 31, 2007]
- Summary of 2007 Loss Factor Meeting Notes and Actions[Posted: June 1, 2007]
2006 loss factors archive
- 2007 Draft Loss Factors[Posted: August 26, 2014]
- Feb. 22 Stakeholder Meeting - Summary of 2006 Loss Factor Meeting Notes and Actions[Posted: February 23, 2006]
- Stakeholder Presentation: Proposed 2006 Loss Factor Web Based Calculations[Posted: February 23, 2006]
- Summary of 2006 Loss Factor Meeting Notes and Actions - January 2006[Posted: May 4, 2006]
- 2006 Loss Factor Milestones[Posted: May 4, 2006]
- rule presentation 2000426[Posted: May 4, 2006]
- Tutorial on Generic Stacking Order Preparation based on AESO Rules - July 19, 2006
- Summary of 2006 Loss Factor Meeting Notes and Actions[Posted: July 25, 2006]
- AESO Response to Questions on the 2006 Loss Factor Generic Stacking Order[Posted: September 14, 2006]
- 2007 AESO Draft Loss Factors - Questions and comments from HR Milner[Posted: November 1, 2006]
- AESO Loss Factors Meeting October 24, 2006 - Action Items[Posted: November 6, 2006]
- 2007 AESO Loss Factors - Questions and comments from HR Milner[Posted: November 6, 2006]
- Letter to Loss Factors Stakeholder Team – Draft Loss Factors for 2007[Posted: August 26, 2014]
- Agenda - Loss Factor Meeting, February 22 2006[Posted: February 16, 2006]
2005 loss factors archive
- Transmission Loss Factors - Part 2 Preliminary Report and Recommendations[Posted: January 13, 2005]
- Stakeholder Letter re: 2010 loss factor values and import/export curves[Posted: February 17, 2005]
- Response to ATCO Comments re: Loss Factor Methodology[Posted: March 1, 2005]
- Treatment of confidential data in the GSO for Loss Factor calculations[Posted: March 1, 2005]
- AESO responses to Loss Factor Methodology questions (revised)[Posted: March 17, 2005]
- Draft ISO Rule re: Transmission Loss Factor Methodology[Posted: March 1, 2005]
- Loss Factor Methodology - Version 5[Posted: March 7, 2005]
- Loss Factor Rule - Version 3[Posted: March 10, 2005]
- Transmission Loss Methodology and Assumptions[Posted: March 10, 2005]
- Transmission Loss Factor Initiative Update - March 2005[Posted: March 10, 2005]
- Two Bus Example Presentation[Posted: March 17, 2005]
- Further clarification re: Proposed 2006 Loss Factor Methodology[Posted: March 17, 2005]
- Response to Calpine comments re: Loss Factors draft rule[Posted: March 24, 2005]
- Import/Export Loss Factor Curves[Posted: February 17, 2005]
- 2010 Loss Factor Values[Posted: February 17, 2005]
- Transmission Loss Factors - Part 1 Preliminary Report and Recommendations[Posted: January 13, 2005]
- Transmission Loss Factors - Stakeholder Letter re: Data Confidentiality for 2006 Loss Factor Methodology[Posted: January 13, 2005]
- Transmission Loss Factors - Jan. 28, 2005 Stakeholder Meeting Invite (Revised)[Posted: January 20, 2005]
- Jan. 28, 2005 Loss Factor Meeting Notes and Actions[Posted: February 10, 2005]
- Draft Loss Factor Methodology Discussion Paper[Posted: February 10, 2005]
- Feb. 9, 2005 cover letter re: Loss Factor Methodology[Posted: February 10, 2005]
- Preliminary 2005 Loss Factors[Posted: February 17, 2005]
- Loss Factors Rules Process Calendar[Posted: February 17, 2005]
- Issue Paper: Prosposed process for development of Loss Factors[Posted: February 17, 2005]
- Loss Factor Methodology Evaluation: Loss Factor Compression[Posted: February 17, 2005]
- Loss Factor Methodology Evaluation: Conversion of Power to Energy Loss Factors[Posted: February 17, 2005]
- Loss Factor Methodology Evaluation: Determination of "Raw" Loss Factors[Posted: February 17, 2005]
- AESO Resolution of Issues - 2006 Loss Factors Methodology[Posted: April 5, 2005]
- Determination of raw loss factors - ranking table summary[Posted: April 7, 2005]
- Loss Factor Curve Analysis[Posted: April 14, 2005]
- Transmission Loss Factor Data Confirmation for 2006, Spring Season, March-May[Posted: July 7, 2005]
- Tutorial on GSO Preparation[Posted: July 7, 2005]
- AESO Letter re: Transmission Regulation Implementation Plan[Posted: July 13, 2005]
- DOE Response to AESO Re: Transmission Regulation Implementation Plan[Posted: July 13, 2005]
- Calibration Factor Calculation Flow Chart[Posted: August 11, 2005]
- Loss Factor Case Validation Checklist[Posted: August 11, 2005]
- Information re:Calculation of Loss Factors for Imports and Exports[Posted: August 18, 2005]
- August 9 Meeting Notes and Actions[Posted: August 18, 2005]
- Export Loss Factors Multiple Charge Issue[Posted: August 26, 2005]
- Agenda Item 5 – Tie line import and export issues September 13, 2005[Posted: September 28, 2005]
- AESO's response to TransCanada Energy's e-mail September 15, 2005[Posted: September 28, 2005]
- AESO's response to Maxim's e-mail September 19, 2005[Posted: September 28, 2005]
- June 2 meeting notes and actions[Posted: July 23, 2005]
- Transmission Loss Factor data confirmation letter for 2006[Posted: June 9, 2005]
- Loss Factor Rule Definitions[Posted: April 14, 2005]
- Loss Factor Rule[Posted: April 14, 2005]
- Loss Factor Process and Assumptions[Posted: April 14, 2005]
- Loss Factor Transition Proposal[Posted: April 14, 2005]
- Comments on Incremental Loss Factor Methodology[Posted: April 20, 2005]
- March 8 and 17 meeting notes and actions[Posted: April 20, 2005]
- Three-year Transition Cost Analysis[Posted: April 28, 2005]
- Two-year Transition Cost Analysis[Posted: April 28, 2005]
- AESO Loss Factor Response to Calpine[Posted: May 12, 2005]
- AESO Loss Factor Response to Maxim[Posted: May 12, 2005]
- Loss Factors Rules Issues[Posted: May 25, 2005]
- 2006 Loss Factors Transision Decision[Posted: May 26, 2005]
- Summary of 2006 Loss Factor Meeting Notes and Actions - Oct. 4, 2005[Posted: October 13, 2005]
2004 loss factors archive
- March 2004 - Audit of Current Loss Factor Methodology
- March 2004 - Audit, Public Appendix 1[Posted: April 7, 2004]
- March 2004 - Audit, Public Appendix 2[Posted: April 7, 2004]
