Recalculated 2016 loss factors

Loss factors are used to determine the transmission losses charges that apply to system access service under the following rates of the ISO tariff in 2016:

• Rate STS, Supply Transmission Service
• Rate XOS, Export Opportunity Service
• Rate IOS, Import Opportunity Service
• Rate DOS, Demand Opportunity Service

The AESO must recalculate loss factors and losses charges in accordance with Decisions 790-D04-2016 and 790-D06-2017 of the Alberta Utilities Commission in Proceeding 790, Complaints Regarding the ISO Transmission Loss Factor Rule and Loss Factor Methodology. The AESO corrected errors identified in system topologies used in the initial recalculation of Module C loss factors for 2016 and posted the corrected loss factors on September 15, 2021. For more information, see the update posted in the stakeholder engagement section of the loss factor page here. The corrected recalculated 2016 loss factors are provided here:

• Recalculated 2016 loss factors effective 1 Jan 2016 to 31 Dec 2016 [Corrected: Sep 13, 2021] 

The AESO must provide additional information related to the recalculated loss factors. This additional information is provided here:

• Hourly merit order data for 2016 loss factors (ZIP file, 11 MB) [Posted: May 28, 2020] 
• Sample of hourly load data for 2016 loss factors (ZIP file, 3 MB) [Updated: August 14, 2020]
• Process for requesting access to system topologies
• Procedure to determine transmission system losses for loss factor calculations [Posted: May 28, 2020] 
• Software and scripts used to calculate hourly raw loss factors (ZIP file, 142 MB) [Posted: May 28, 2020] 
• Workbook showing calculations for 2016 loss factors (Microsoft Excel, 81 MB) [Corrected: Sep 13, 2021]    

The initial loss factor postings for the third Module C settlement period, which have been corrected above, remain available below for the interest of stakeholders:

• Recalculated 2016 loss factors effective 1 Jan 2016 to 31 Dec 2016 [Posted: May 28, 2020] 
• Workbook showing calculations for 2016 loss factors (Microsoft Excel, 83 MB) [Posted: May 28, 2020]

Actual losses on the transmission system were 2,158 GWh for 2016 and the average loss factor for the transmission system was 3.53% for 2016.

Previously published recalculated 2016 loss factors

After the initial publication of recalculated 2016 loss factors on July 25, 2018, the AESO implemented revisions to its loss factor calculation software that were applied to revise the recalculated 2016 loss factors. The AESO provides the initially published recalculated 2016 loss factors and additional information for the reference of market participants:

• Recalculated 2016 loss factors effective 1 Jan 2016 to 31 Dec 2016 [Posted July 25, 2018]
  
• Hourly merit order data for 2016 loss factors (ZIP file, 11 MB) [Posted July 25, 2018]
• Sample of hourly load data for 2016 loss factors (ZIP file, 2 MB)[Posted July 25, 2018]
• Process for requesting access to system topologies
• Procedure to determine transmission system losses for loss factor calculations [Posted July 25, 2018]
• Software and scripts used to calculate hourly raw loss factors (ZIP file, 96 MB) [Posted July 25, 2018]
• Workbook showing calculations for 2016 loss factors (Microsoft Excel, 86 MB) [Posted July 25, 2018]