1. Pushing the Button / Relief Duration Design Areas
ECC Final State
Pushing the Button / Relief Duration Design Areas

2. Design Area Table New assumptions added from last meeting
RC initiates mitigation
20 minute response requirement

3. Topics to Resolve Which snapshot to use for baseline?
What happens during the 20 minute response period?
How long will mitigation last after the issuance and 20 minute fulfillment completes?

4. Snapshot for Baseline Consideration 1
Flow increases from first snapshot requiring additional relief obligation
Time
Total Flow on Element (MW)
Total Relief Obligation (MW)
xx:00
500
100
Relief Obligation assigned here
xx:05
550
150
xx:10
600
200
xx:15
650
250
xx:20
700
300
“Button” pushed; Now what?

5. Snapshot for Baseline Consideration 2
Exceedance occurs prior to 45 after but “button” pushed after that time
Forecast and Outage Data used
Button pushed (New Relief Obligation baseline?)
New forecast, tag, and outage data available for next hour
Initial Exceedance occurs (Relief Obligation baseline)

6. Snapshot for Baseline Consideration 3
Volume of notifications based on one snapshot exceedance can generate significant alerts (approximately 32,000 in 2017)
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7. Snapshot for Baseline Consideration 4
Burden on ECC to calculate unnecessary relief obligations
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8. Snapshot for Baseline Consideration 5
One or more entities with relief obligation cannot provide their relief (rare)
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9. Snapshot for Baseline Summary
Based on the complexities in the various considerations, Peak recommends that the snapshot for baseline should be captured when the relief obligation is issued

10. Actions During 20 Minute Response Standards
INT (will anything ECC does be late?)
INT (do any BAs use this?)
INT-004-WECC-CRT-2.1 (does R1 set the curtailment start time ?)

11. Actions During 20 Minute Response Timeline
“Button” pushed; Relief obligation issued
BAs/TOPs determine mitigation actions (ACE, Gen, Tags)
BA confirms response; Curtailments issued
Gen and ACE movements in progress or completed; Curtailments approved
Relief obligation verification measurement; ECC has Tag step change value if effective at T20
End of ramp for curtailments if issued effective at T20 (assuming 10 min straddle) T0 T5
T10
T15
T20
T25

12. Mitigation Duration Assumptions
Any R.O. event that is issued continues until the end of the current hour
Any new R.O. events issued after 40 past the hour will be effective until the end of the next hour
Any existing R.O. events that are reassessed at 45 past and require extension will be effective until the end of the next hour

13. Mitigation Duration Examples
Event Issued
Event Measured
Event Reassessed (9:45)
Event Termination
9:05
9:25 No
10:00
9:27
9:50
Yes
11:00
9:40
9:41
10:01
N/A?