Bruce + West Bottling The IESO Transmission System тАв The transmission system is made up of a number of circuits all of which have unique capabilities and thermal limitations. тАв Our generation dispatching tool is designed to recognize these limitations and dispatch resources appropriately in order to respect them. тАв These limitations at times lead to an inability to utilize available generation due to a lack of paths out of a region тАУ Bottled Energy The IESO Transmission System тАв These values are dynamic and can change every 5 minutes based on temperature, wind speed, day/night etc... тАв Result of which are two schedules (constrained and unconstrained) тАв As these limitations are automatically respected there is no formal operating instruction for how to manage these limits. тАв In other words, no SCO exists for these subareas Circuit Thermal Ratings тАв The thermal capabilities of the circuits are provided to us from each circuitтАЩs asset owner тАв Revised thermal limits, in the form of a lookup table are provided to the IESO for each circuit every hour to reflect current real time conditions. Bottling Estimates тАвBottled generation is normally calculated by zone whereby: тАвBottled Gen = Available Gen-Zonal Demand -Ability to leave Zone тАвZones are generally divided by transmission interfaces. Bruce + West Transmission BRUCE FABCW MICH-ONT INTERFACE WEST SOUTH WEST Interface Limits тАв FABCW is the Flow Away from the Bruce Complex + Wind тАв FABCW limit is dependent on a number of factors including actual flow on the BLIP interface. тАв This limit is required to preserve plant stability in the area as well as to protect against voltage collapse post contingency. тАв BLIP is the Buchanan Longwood Input. тАв BLIP flow 0 is generally limited to 3,000 MW and Negative BLIP (NBLIP) generally varies between 500 to 1,500 MW. тАв Both limits are based on voltage limitations Interface Limits тАв At times, the transmission capability internal to a zone may be more limiting than the interface limit. тАв In these cases, the traditional methodology for measuring Bottling is not adequate тАв This is the case in the West and thus the zone was divided into 4 sub-areas, each divided by a boundary. тАв The traditional bottling equation is then applied to each individual sub-area. The WEST Each sub-area contains both generation and load. яВО MICHONT яВМ G яВН яВОяВП``` L G `L ` ` ` яВП NBLIP тЙИ 500 - 1,500 MW G G L L Boundary Thresholds 1. 3,058 MW тАУ 4,045 MW 2. 3,010 MW тАУ 3,981 MW 3. 2,218 MW тАУ 2,836 MW Bottling In The West тАв These four boundary thresholds are based on simulations done by the IESO. тАв The simulation was designed to maximize generation. тАв The boundary threshold values are the estimated maximum total generation that can be produced before a thermal limit of a circuit out of that sub-area begins to encroach on its limit. тАв These boundary threshold values are used as estimates for modelling purposes only. Bottling In The West тАв Because these boundary are a result of thermal restrictions, each boundary has a different threshold for a number of temperature ranges. тАв The threshold range is based on temperatures from -20┬░C to 35 ┬░C and change by 5┬░C increments Boundary Thresholds Temperature (┬░C) Boundary 1 (MW) Boundary 2 (MW) Boundary 3 (MW) -20 4,045 3,981 2,836 -15 3,968 3,905 2,786 -10 3,885 3,824 2,737 -5 3,789 3,729 2,684 0 3,711 3,652 2,635 5 3,629 3,571 2,586 10 3,531 3,476 2,537 15 3,431 3,376 2,467 20 3,353 3,300 2,418 25 3,256 3,205 2,353 30 3,155 3,105 2,287 35 3,058 3,010 2,218 Looking Forward тАв Transmission enhancements throughout the province тАв The shutdown of coal fired generation тАв Bottled numbers are expected to decrease Thank You! Questions?