This Nodal Protocol Revision Request (NPRR) incorporates a number of revisions to address recent changes made to Public Utility Commission of Texas (PUCT) Substantive Rule 25.505 in PUCT Project No. 48721, Rulemaking Proceeding To Amend 16 TAC 25.505, Relating to Resource Adequacy in the Electric Reliability Council of Texas Power Region and to Repeal 16 TAC 25.508, Relating to the High System-Wide Offer Cap in the Electric Reliability Council of Texas Power Region. Specifically, this NPRR:
• Deletes paragraph (1) of Section 3.2.3 which contained general statements about ERCOT’s system adequacy reporting requirements. Similar language was deleted from Substantive Rule 25.505(d).
• Deletes paragraph (2) of Section 3.2.3 which required ERCOT to post a Medium-Term System Adequacy Report. The requirement for this report was removed from Substantive Rule 25.505(d). The following components
of the existing Medium-Term System Adequacy Report will be retained pursuant to requirements in other Protocol sections:
o Ancillary Service Requirement Methodology, which is also required to be posted on the Market Information System (MIS) Public Area pursuant to paragraph (3) of Protocol Section 1.1, Summary of the ERCOT
Protocols Document, due to its inclusion on the Other Binding Documents List.
o Long-Term Daily Load Forecast, which is also required to be posted on the MIS Secure Area pursuant to paragraph (1)(b) of Section 3.12, Load Forecasting.
o Long-Term Weekly Peak Demand Forecast, which is also required to be posted on the MIS Secure Area pursuant to Section 3.2.2, Demand Forecasts.
Since the only remaining content in Section 3.2.3 relates to short-term system adequacy reports, this NPRR also proposes to change the title to Section 3.2.3 to “Short-Term System Adequacy Reports.”
• Revises paragraphs (3)(a), (b), (c), (g), and (h) of Section 3.2.3, which relates to short-term adequacy reports, to reflect the requirement in amended Substantive Rule 25.505(d) that information concerning Resource
availability be aggregated by Load Zone or area.
• Deletes paragraphs (3)(e) and (f) of Section 3.2.3, which required that short-term adequacy reports include daily Ancillary Service requirements and transmission constraints that have a high probability of being binding in
Security-Constrained Economic Dispatch (SCED) or the Day-Ahead Market (DAM) given the forecasted system conditions for each week including the effects of any transmission or Resource Outages. The requirement to
include this information in ERCOT’s short-term adequacy reports was removed from Substantive Rule 25.505(d).
• Deletes Section 3.2.4. The requirement for this report was removed from Substantive Rule 25.505 (formerly paragraph (c)).
• Changes instances of “48 hours” to “three days” in Section 3.2.5 to align with a similar change made in Substantive Rule 25.505(f).
• Changes instances of “annual Resource adequacy cycle” to “year” in Sections 4.4.11 and 18.104.22.168 to align with a similar change made in Substantive Rule 25.505(g).
• Revises the formula for Initial Minimum Current Exposure (IMCE) in paragraph (2) of Section 22.214.171.124 to be based on the System-Wide Offer Cap (SWCAP) in effect, rather than the greater of the SWCAP and the Value of
Lost Load (VOLL). This change reflects new Substantive Rule 25.505(g)(6)(E), which states that the VOLL will be equal to the value of the SWCAP in effect (i.e., SWCAP and VOLL will not vary from one another).