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TITLE 16ECONOMIC REGULATION
PART 2PUBLIC UTILITY COMMISSION OF TEXAS
CHAPTER 25SUBSTANTIVE RULES APPLICABLE TO ELECTRIC SERVICE PROVIDERS
SUBCHAPTER CINFRASTRUCTURE AND RELIABILITY
RULE §25.55Weather Emergency Preparedness

    (A) ERCOT must provide a written report on its inspection of a resource to the generation entity. The written inspection report must address whether the generation entity has complied with the requirements in subsection (c)(1) or (2) of this section.

    (B) If the generation entity has not complied with a requirement in subsection (c)(1) or (2) of this section, ERCOT must provide the generation entity a reasonable period to cure the identified deficiencies.

      (i) The cure period determined by ERCOT must consider what weather emergency preparation measures the generation entity may be reasonably expected to have taken before ERCOT's inspection, the reliability risk of the resource's noncompliance, and the complexity of the measures needed to cure the deficiency.

      (ii) The generation entity may request ERCOT provide a longer period to cure the identified deficiencies. The request must be accompanied by documentation that supports the request.

      (iii) ERCOT, in consultation with commission staff, will determine the revised cure period after considering a request for a longer period to cure the identified deficiencies.

    (C) ERCOT must report to commission staff any generation entity that does not remedy the deficiencies identified under subparagraph (A) of this paragraph within the cure period determined by ERCOT under subparagraph (B) of this paragraph.

    (D) A generation entity reported by ERCOT to commission staff under subparagraph (C) of this paragraph will be subject to enforcement investigation under §22.246 of this title (relating to Administrative Penalties). A violation of this section is a Class A violation under §25.8(b)(3)(A) of this title (relating to Classification System for Violations of Statutes, Rules, and Orders Applicable to Electric Service Providers) and may be subject to a penalty not to exceed $1,000,000 per violation per day.

(e) Weather-related failures by a generation entity to provide service. ERCOT must notify a generation entity and commission staff of the generation entity's repeated or major weather-related forced interruption of service. Upon notification from ERCOT, the generation entity must contract with a qualified professional engineer to assess its weather emergency preparation measures, plans, procedures, and operations. The qualified professional engineer must not be an employee of the generation entity or its affiliate. The qualified professional engineer must not have participated in previous assessments for the resource for at least five years, unless the generation entity provides documentation that no other qualified professional engineers are reasonably available for engagement. The qualified professional engineer must conduct a root cause analysis of the failure and develop a corrective action plan to address any weather-related causes of the failure. The generation entity must submit the qualified professional engineer's assessment to the commission and ERCOT within 15 calendar days of receiving the assessment. A generation entity to which this subsection applies may be subject to additional inspections by ERCOT. ERCOT must refer to commission staff for investigation any generation entity that does not comply with a provision of this subsection.

(f) Weather emergency preparedness reliability standards for a TSP.

  (1) Winter season preparations. By December 1 each year, a TSP must complete the following winter weather preparation measures for its transmission facilities. A TSP must maintain these measures throughout the winter season and complete any ongoing requirements at the appropriate time. If necessary to come into compliance, a TSP must update its winter weather preparation measures no later than one year after ERCOT files a historical weather study report under subsection (i) of this section.

    (A) Implement weather emergency preparation measures that could reasonably be expected to ensure the sustained operation of all cold weather critical components during winter weather conditions. Where appropriate, such measures may be implemented using either personnel or automated systems. Such measures include, as appropriate for the facility:

      (i) Confirmation of the operability of all systems and subsystems containing all cold weather critical components;

      (ii) Confirmation that the sulfur hexafluoride gas in breakers and metering and other electrical equipment is at the correct pressure and temperature to operate safely during winter weather emergencies, and perform annual maintenance that tests sulfur hexafluoride breaker heaters and supporting circuitry to assure that they are functional; and

      (iii) Confirmation of the operability of power transformers and auto transformers in winter weather emergencies by:

        (I) Inspecting heaters in the control cabinets;

        (II) Verification that main tank oil levels are appropriate for actual oil temperature;

        (III) Inspecting bushing oil levels;

        (IV) Inspecting the nitrogen pressure, if necessary; and

        (V) Verification of proper oil quality such that moisture and dissolved gases are within acceptable ranges for winter weather conditions.

    (B) Beginning in 2023, implement weather emergency preparation measures by December 1 each year, in addition to the weather emergency preparation measures required by subparagraph (A) of this paragraph, that could reasonably be expected to ensure the sustained operation of the TSP's transmission facilities at the 95th percentile minimum average 72-hour wind chill temperature reported in ERCOT's historical weather study, required under subsection (i) of this section, for the weather zone in which the facility is located.

    (C) Review the adequacy of staffing plans to be used during a winter weather emergency and revise the staffing plans, as appropriate.

    (D) Train relevant operational personnel on winter weather preparations and operations.

    (E) Beginning in 2023, create a list of all cold weather critical components, review the list at least annually prior to the beginning of the winter season, and update the list as necessary.

  (2) Summer season preparations. By June 1 each year, a TSP must complete the following summer weather preparation measures for its transmission facilities. A TSP must maintain these measures throughout the summer season and complete any ongoing, monthly, or regular requirements at the appropriate time. If necessary to come into compliance, a TSP must update its summer weather preparation measures no later than one year after ERCOT files a historical weather study report under subsection (i) of this section.

    (A) Implement weather emergency preparation measures that could reasonably be expected to ensure the sustained operation of all hot weather critical components during summer weather conditions. Where appropriate, such measures may be implemented using either personnel or automated systems. Such measures include, as appropriate for the facility:

      (i) Inspecting transformer cooling systems prior to and on a monthly basis during the summer season;

      (ii) Cleaning transformer cooling systems prior to and on a regular basis during the summer season;

      (iii) Verifying proper functioning of cooling fans and pump controls;

      (iv) Arrange and provide for the availability of sufficient chemicals, coolants, and other materials necessary for sustained operations during a summer weather emergency; and

      (v) Confirmation that sufficient chemicals, coolants, and other materials necessary for sustained operations during a summer weather emergency are protected from heat and drought.

    (B) Beginning in 2023, implement weather emergency preparation measures by June 1 each year, in addition to the weather emergency preparation measures required by subparagraph (A) of this paragraph on, that could reasonably be expected to ensure the sustained operation of the TSP's transmission facilities during the greater of the maximum ambient temperature at which the facility has experienced sustained operations or the 95th percentile maximum average 72-hour temperature reported in ERCOT's historical weather study, required under subsection (i) of this section, for the weather zone in which the facility is located.

    (C) Review the adequacy of staffing plans to be used during a summer weather emergency and revise the staffing plans, as appropriate.

    (D) Train relevant operational personnel on summer weather preparations and operations.

    (E) Beginning in 2023, create a list of all hot weather critical components, review the list at least annually prior to the beginning of the summer season, and update the list as necessary.

  (3) Declaration of preparedness. A TSP must submit to ERCOT, on a form prescribed by ERCOT, the following declarations of weather preparedness:

    (A) No earlier than November 1 and no later than December 1 of each year, a TSP must submit a declaration of winter weather preparedness for the upcoming winter season that:

Cont'd...

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