Sheryl Welch, ATFWG Chair
August 20, 2014
Portland, OR
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Generator was incorrectly registered in Electric
Industry Registry (EIR) as a sink.
◦ Generator has been removed as a sink in EIR.
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PSE tagged to and from the generator between
April 28th thru April 30th.
Tags using the incorrect sink were discovered
May 1st.
The PSE was asked to correct the tag problem
by using the original source and the final sink
with a wheel thru the generator.
Until the ATF tags were implemented, the
Primary Inadvertent continued to accrue.
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29 WECC Schedule Change Request Forms
were submitted to WECC Dispute Reports
◦ Submitted on May 1, 2014 approximately 10:30
PDT
◦ Contained 156 Scheduled hours
◦ 86 of the scheduled hours reported “Wrong Sink”
 9 Balancing Authority (BAs) involved
◦ 70 of the scheduled hours reported “Wrong Source”
 2 BAs involved
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WECC Schedule Change Request Forms were
completed at approximately 1300 MDT on
May 1st.
◦ Required two WECC staff members
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Approximately 16:59, WECC received a
WECCNet message from BA1 reporting that it
was not participating in the Automatic Time
Error correction until “OATI corrects their
primary inadvertent calculations.”
◦ At 08:19 on May 2nd, WECC started an investigation
with BA1 to determine why the inadvertant was
incorrect.
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WECC received a telephone call from BA2
wanting to know why there were so many
issues in WIT regarding Primary Inadvertents.
◦ Review of WIT showed the Inadvertent Interchange
Accumulations for BA2 was during the same 3-day
period as the WECC Schedule Change Request
Forms.
◦ PSE notified BA1 that ATF tags would not be ready
for implementation until late on May 2nd or not
until Monday, May 5th.
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◦ After notified by WECC, BA2 requested that either the
original schedules be put back into WIT or the ATF tags
get implemented immediately.
 Until ATF tags are implemented, WIT showed up to 4,000
amount of erroneous “payback” of accumulated primary
inadvertent through Automatic Time Error Correction (ATEC).
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WECC instructed the PSE to approve and
implement ALL ATF tags immediately or all
schedules would be returned to WIT until the ATF
tags could be ready for processing.
◦ Until ATF tags are implemented, primary inadvertent
would continue to accumulate.
◦ PSE submitted ATF Tags at 10:47 on May 2nd.
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◦ Prior to ATF tags, Primary Inadvertent values from
April 28th thru April 30, 2014, were as high as
4,000 MW
◦ After ATF tags, the On-Peak Primary Inadvertent
resulted in only 287 MW (prior inadvertent value).
◦ Primary Inadvertent is to be paid back each
scheduled hour through ATEC
 If problem is not caught early, BAs could payback a
large amount of Primary Inadvertent.
 If ATF tags are not implement timely, Primary
Inadvertent could in fact be in opposite direction of the
correct Accumulated Primary Inadvertent.
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Effective April 1, 2014, WECC Standard BAL004-WECC-02 R3: Each Balancing Authority
shall keep its ATEC in service, with an
allowable exception period of less than or
equal to an accumulated 24 hours per
calendar quarter for ATEC to be out of
service.
◦ This issue was resolved within 21hours.
◦ However, the time gets accounted for in the
quarterly accumulation.
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ATF tags should be created and implemented
in a reasonable amount of time shortly after
the agreed upon WECC Schedule Change
Request Forms are implemented to avoid
significant Accumulated Primary Inadvertent.
Avoid creating ATF tags after 2:00 pm (PDT).
◦ WECC staff is on MDT
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