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Bruce + West Bottling The IESO Transmission System • The transmission system is made up of a number of circuits all of which have unique capabilities and thermal limitations. • Our generation dispatching tool is designed to recognize these limitations and dispatch resources appropriately in order to respect them. • These limitations at times lead to an inability to utilize available generation due to a lack of paths out of a region – Bottled Energy The IESO Transmission System • These values are dynamic and can change every 5 minutes based on temperature, wind speed, day/night etc... • Result of which are two schedules (constrained and unconstrained) • As these limitations are automatically respected there is no formal operating instruction for how to manage these limits. • In other words, no SCO exists for these subareas Circuit Thermal Ratings • The thermal capabilities of the circuits are provided to us from each circuit’s asset owner • 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 •Bottled generation is normally calculated by zone whereby: •Bottled Gen = Available Gen-Zonal Demand -Ability to leave Zone •Zones are generally divided by transmission interfaces. Bruce + West Transmission BRUCE FABCW MICH-ONT INTERFACE WEST SOUTH WEST Interface Limits • FABCW is the Flow Away from the Bruce Complex + Wind • FABCW limit is dependent on a number of factors including actual flow on the BLIP interface. • This limit is required to preserve plant stability in the area as well as to protect against voltage collapse post contingency. • BLIP is the Buchanan Longwood Input. • BLIP flow 0 is generally limited to 3,000 MW and Negative BLIP (NBLIP) generally varies between 500 to 1,500 MW. • Both limits are based on voltage limitations Interface Limits • At times, the transmission capability internal to a zone may be more limiting than the interface limit. • In these cases, the traditional methodology for measuring Bottling is not adequate • This is the case in the West and thus the zone was divided into 4 sub-areas, each divided by a boundary. • The traditional bottling equation is then applied to each individual sub-area. The WEST Each sub-area contains both generation and load. MICHONT G ``` L G `L ` ` ` NBLIP ≈ 500 - 1,500 MW G G L L Boundary Thresholds 1. 3,058 MW – 4,045 MW 2. 3,010 MW – 3,981 MW 3. 2,218 MW – 2,836 MW Bottling In The West • These four boundary thresholds are based on simulations done by the IESO. • The simulation was designed to maximize generation. • 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. • These boundary threshold values are used as estimates for modelling purposes only. Bottling In The West • Because these boundary are a result of thermal restrictions, each boundary has a different threshold for a number of temperature ranges. • 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 • Transmission enhancements throughout the province • The shutdown of coal fired generation • Bottled numbers are expected to decrease Thank You! Questions?