From 32ecb91e238835b0d13b8ff281e12a4da743c037 Mon Sep 17 00:00:00 2001 From: Christopher Atkins Date: Wed, 31 Jul 2024 19:47:04 +0000 Subject: [PATCH] discourse on recourse ratings --- docs/concepts.md | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/docs/concepts.md b/docs/concepts.md index dfe23e5..152a57e 100644 --- a/docs/concepts.md +++ b/docs/concepts.md @@ -60,6 +60,45 @@ For TROLIE's purposes, a Rating is simply a **proposed** Limit for a Period of an Operational Window from a Ratings Provider for a particular Power System Resource. +### Recourse Ratings + +For background the reader is directed to sections 180 and 182 of the FERC Order +881 Final Rule as well as [this paragraph](https://www.federalregister.gov/d/2021-27735/p-1394) +from the pro forma Attachment M which states: + +> "The Transmission Provider must use Seasonal Line Ratings as a recourse rating in the event that an AAR otherwise required to be used under this Attachment is unavailable." + +Additionally, in section 180: + +> "Further, while this provision establishes the seasonal line rating as the default recourse rating, the transmission provider retains the ability [...] to use a different recourse rating where the transmission provider reasonably determines such a rating is necessary to ensure the safety and reliability of the transmission system." + +Here we are concerned with three circumstances that require might require a recourse rating: + +1. A Ratings Provider cannot determine an AAR for a facility with a Ratings Obligation. +2. The Clearinghouse Provider is not in possession of a rating for a Ratings Obligation. +3. The Clearinghouse Provider determines that the rating in its possession is apparently inaccurate. + +{: .nb } +> In no situation requiring a recourse rating does the TROLIE specification +> constrain or dictate a course of action. However, in order to have a *working +> definition* of recourse rating useful in documenting the specification, we +> examine anticipated uses of recourse ratings in the three circumstances +> identified in the preceding paragraph. + +In the first case, under the assumption that the Clearinghouse Provider will +receive the rating, it is anticipated that the Ratings Provider send an +appropriate recourse rating, e.g., the effective seasonal rating, when the +Ratings Provider cannot determine an AAR. + +The second and third cases might occur when there is a communication outage or +when the rating proposed by the Ratings Provider did not meet pre-coordinated +validation criteria such as timeliness or lying within reasonability bounds. +Regardless, in such circumstances the Clearinghouse Provider is obliged to use a +recourse rating. Typically, the recourse rating in this circumstances is +anticipated to be a rating provided by the Ratings Provider separately, such as +the effective seasonal rating, a verbal override, or even a previously +forecasted rating. + ## Power System Resource, or simply _Resource_ A term borrowed from CIM, in the context of TROLIE, a "Resource" is an object of