Loss Factors (Effective January 1, 2009)
Alberta Transmission Losses
A transmission network is a series of electrical paths through which electrical power flows. The network connects consumers to the generators or producers of electrical power. Since the transmission lines are made of physical conductors, loss of electrical power occurs in the line. These losses can be significant in a large network.
Generally speaking, the transmission system consists of facilities energized at 138 kilovolts (kV) or higher. The higher voltage used to transmit electricity tends to increase power flow and reduce transmission losses. Losses are equal to the square of the electric current (I) flowing through any line, times the value of the resistance of the line (R): Losses=I2XR. Transmission losses are unavoidable. Generating units supply the losses as well as the loads in a network.
For a summary of loss factors and process overview, please click here.
Methodology
Based on specific criteria, varying methodologies are used in different jurisdictions for the allocation of losses among the generating units to recover the losses.
Alberta introduced the new Transmission Loss Factor Methodology in 2006 based on the 2004 Transmission Regulation. Further, changes were made in 2007 and 2008 to incorporate the 2007 Transmission Regulation. The new model is known as 50% Area Load Methodology Using Corrected Loss Matrix. Loss factors are used to recover the loss cost on the transmission system. The methodology and process are updated as required to reflect new circumstances.
For more information on losses and loss factors, please contact the AESO at lossfactor@aeso.ca.