Recalculated 2008 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 2008:
- 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. On August 6, 2021, the AESO advised market participants and other interested parties that it had corrected errors identified in system topologies used in the initial recalculation of Module C loss factors for 2008. For more information, see the update posted in the stakeholder engagement section of the loss factor page here. The recalculated 2008 loss factors are provided here:
- Recalculated 2008 loss factors effective 1 Jan 2008 to 31 Dec 2008 [Corrected: Aug 6, 2021]
The AESO must provide additional information related to the recalculated loss factors. This additional information is provided here:
- Hourly merit order data for 2008 loss factors (ZIP file, 10 MB) [Posted: Dec 14, 2020]
- Sample of hourly load data for 2008 loss factors (ZIP file, 2 MB) [Posted: Dec 14, 2020]
- Process for requesting access to system topologies
- Procedure to determine transmission system losses for loss factor calculations [Posted: Dec 14, 2020]
- Software and scripts used to calculate hourly raw loss factors (ZIP file, 89 MB) [Posted: Dec 14, 2020]
- Workbook showing calculations for 2008 loss factors (Microsoft Excel, 71 MB) [Corrected: Aug 6, 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 2008 loss factors effective 1 Jan 2008 to 31 Dec 2008 [Posted: Dec 14, 2020]
- Workbook showing calculations for 2008 loss factors (Microsoft Excel, 71 MB) [Posted: Dec 14, 2020]
Actual losses on the transmission system were 2,672 GWh for 2008 and the average loss factor for the transmission system was 4.69% for 2008.
