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Business Practice Manual Change Management

11.1.3                Off-Peak Opportunity RA Maintenance Outage

ISO Tariff Section 9.3.1.3.3.3

An Off-Peak Opportunity RA Maintenance Outage may be approved by the ISO to be initiated and completed during off-peak hours without RA Substitute Capacity for the resource adequacy capacity on the outage. 

A request for an Off-Peak Opportunity RA Maintenance Outage must meet the following conditions:

Outage must be submitted to the CAISO no more than forty-five days prior to the first day of the resource adequacy month for which the outage is requested and no less than eight days prior to the start date for the outage

1.        Schedule the outage to begin during off-peak hours on a weekday, and to be completed prior to on-peak hours the following weekday, or to begin during off-peak hours on Friday, or on Saturday, Sunday, or a holiday, and to be completed prior to on-peak hours  on the next weekday.,

The ISO will consider requests for an Off-Peak Opportunity RA Maintenance Outage in the order the requests were received. 

If the ISO Outage Coordination denies a request for an Off-Peak Opportunity RA Maintenance Outage for failing to meet the requirements in Section 9.3.1.3.3.3(c)(2), the Scheduling

Coordinator for the Resource Adequacy Resource may request an RA Maintenance Outage with Substitution or may request that the ISO accommodate the outage at another time.  

To the extent that an approved Off-Peak Opportunity RA Maintenance Outage is not completed during off-peak hours as scheduled, and extends into on-peak hours, the Scheduling Coordinator for the resource must submit the portion of the outage that extends into on-peak hours as a new Forced Outage.

Off Peak Hours

Weekday hours from HE 23 to HE 06 and all day Saturdays, Sundays, and WECC holidays.

a.        New Year’s Day

b.        Martin Luther King Day

c.        President’s Day

d.        Good Friday

e.        Memorial Day

f.         Independence Day

g.        Labor Day

h.        Veteran’s Day

i.          Thanksgiving Day

j.          Friday after Thanksgiving

k.        Christmas Eve

l.          Christmas Day

Variable Energy Resources

Outage must be submitted to the CAISO no more than forty-five days prior to the first day of the resource adequacy month for which the outage is requested and no less than eight days prior to the start date for the outage

Schedule the outage to begin during off-peak hours on a weekday, and to be completed prior to on-peak hours the following weekday, or to begin during off-peak hours on Friday, or on Saturday, Sunday, or a holiday, and to be completed prior to on-peak hours  on the next weekday.

VER resources may schedule outages after the normal daily generating hours, during non-generating periods.  Outage must end by 05:59hrs.

The current POSO requirement is not aligned correctly for Solar VER resources and creates instances of Solar VERs being subject to POSO, strictly as a result of a calculation due to an outage submittal. The status of the solar resource after production hours has no impact on reliability as the resource could not generate once the sun goes down or "after production hours".

Currently, at 10pm, VERs can request an “Off Peak Opportunity Outage (OPOO)” that requires the resource’s return to service by 5:59 AM, the following day. A solar VER cannot produce during these hours. In spite of that, if the SC is short RA, the resource may get a Planned Outage Substitution Obligation (POSO). In order to mitigate superfluous POSO requirements, the creation of a "VER Off Peak Opportunity" selection on outage submittals would eliminate the inessential POSO once selected for Solar Resources (VER) performing overnight maintenance. The CAISO’s VER forecast itself will validate that the use of "VER Off Peak Opportunity" outage is correctly applied.