Reporting Reactive Capability
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By Diego Bailey
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Texas RE has noticed a concerning trend with the following Entity Risk Profile Questionnaire (ERPQ) question: “Enter the total reactive capability of the generation resources owned or operated by your entity (in Mvar).”
When responding to this question regarding Mvar, entities should provide the manufacturer-rated reactive capability (nameplate Mvar rating) of applicable equipment, including generators and reactive devices such as shunt capacitors and reactors. This information should be provided by or available from the equipment manufacturer.
A common response we see is that entities report ERCOT operational values such as High Sustained Limit (HSL) and Low Sustained Limit (LSL) instead of a singular equipment nameplate rating. Registered entities should submit the manufacturer-rated reactive capability of equipment rather than operational values that may vary based on system conditions, dispatch requirements, or temporary operating restrictions.
This approach is consistent with NERC guidance regarding Facility Ratings:
- FAC-008 identifies manufacturer ratings and equipment specifications, including nameplate ratings, as acceptable sources for establishing Equipment Ratings
- NERC’s 2022 ERO Enterprise Themes and Best Practices for Sustaining Accurate Facility Ratings recognizes nameplate ratings as a valid source of rating information and emphasizes the importance of applying rating methodologies consistently across facilities.
If a resource’s nameplate reactive capability is unavailable, please contact your Risk Lead or risk@texasre.org before submitting an alternative value.
