15 MINUTE SCHEDULING BPA Real Time Transmission Service

1. 15 MINUTE SCHEDULING BPA Real Time Transmission Service WECC ISAS August 2014 BONNEVILLE POWER ADMINISTRATION RATES HEARING ROOM PORTLAND, OR

2. SCHEDULING INTERVALS • The 15 Minute Scheduling Intervals are as follows: • 1st Interval XX:00 - XX:15 (Interval A) • 2nd Interval XX:15 - XX:30 (Interval B) • 3rd Interval XX:30 - XX:45 (Interval C) • 4th Interval XX:45 - XX:00 (Interval D) • Start and stop time must be aligned with the scheduling intervals. • Example: • A 45 min schedule = 15:15 to 16:00 • A 2.5 hour schedule = 17:30 to 20:00

3. TRANSSMISSION RESERVATION REQUESTS • Transmission Service Request reservations remain full hour increments. • Hourly Non-firm transmission can be purchased up to the end of the operating hour with a start at the top of the operating hour. • These includes: • 1 - NS - Secondary Hourly PTP • 2 - NH - Hourly PTP • 6 - NN - Hourly NT

4. 15 MINUTE SCHEDULING

5. E-Tag Submittal Times and Ramp Rates E-Tags • E-tags must be submitted 20 minutes prior to the start of the interval to be considered ‘ON Time’ by the Interchange Authority. • Transactions submitted less than 20 minutes prior to the start of the interval will be considered ‘Late’ by the Interchange Authority. Ramp Rates • Top of the hour ramp rate for interval A is 20 min. • Ramp rate for intervals B, C, and D will have 10 min straddle ramps.

6. WIT CHECKOUT for 17 adjacent BA’s • WIT checkout on non integrated value • for the next hour per each interval. • WIT checkout will be completed for next 15 minute interval if there are any changes. • WIT checkout upon other in hour changes

7. CONGESTION MANAGEMENT • After the close of “on time” tags for the next Interval, if needed, BPAT will issue Reliability Limits for only the next 15 minute Interval. • This differs from the WECC 15 Minute Task Force Recommendation of curtailing to the end of the hour. • Reasons for adopting this change: • Less likely to cut intervals unnecessarily or deeper than necessary. • Lessens possibility of multiple curtailments and reloads. • Ensures curtailments are done pro-rata for all schedules in the closed interval.

8. CONGESTION MANAGEMENT (External Path Curtailments - i.e. AC intertie, etc.) • Curtailments will be made in NERC priority and pro-rata within priority for the next Interval. • Will include all tags impacting the path for the next 15 min. interval regardless of duration. • Next Interval Curtailments. • Pro-rata within curtailment priority since January 2014. • Scheduled-based. • Curtailment trigger is when net schedules exceed the next interval System Operating Limit (SOL). • Closed Interval Curtailments • Pro-rate within curtailment priority. • Schedule Based. • Curtailment trigger is when actual flows exceed the SOL • Example of closed interval curtailment:Curtailment at XX:12, the start and stop time will be from XX:12 to XX:45.

9. Congestion Management For Network Flowgates • Next Interval Congestion Management • Curtailment procedure to be expanded to all flowgates (Currently next hour curtailments are initiated only on North of Echo Lake flowgate). • Schedule-based. • Trigger is when next interval forecasted flows exceed the next interval System Operating Limit (SOL). • Reliability Curtailments for Closed Interval • Pro-rata within curtailment priority. • Trigger is when actual flows exceed the SOL. • Example of closed interval curtailment: If cuts are needed at XX:12, the start and top times will be from XX:12 to XX:45. • Closed Interval = The window is closed to submit “on time” e-tags

10. QUESTIONS