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NPRR1034
Summary
| Title | Frequency-Based Limits on DC Tie Imports or Exports |
|---|---|
| Next Group | |
| Next Step | |
| Status | Approved on 02/09/2021 |
Action
| Date | Gov Body | Action Taken | Next Steps |
|---|---|---|---|
| 02/09/2021 | BOARD | Approved | |
| 01/27/2021 | TAC | Recommended for Approval | Revision Request Consideration |
| 01/14/2021 | PRS | Recommended for Approval | Revision Request Consideration |
| 12/10/2020 | PRS | Deferred/Tabled | Impact Analysis Consideration |
| 11/11/2020 | PRS | Recommended for Approval | Impact Analysis Consideration |
| 08/13/2020 | PRS | Deferred/Tabled | Language Consideration |
Voting Record
| Date | Gov Body | Motion | Result |
|---|---|---|---|
| 02/09/2021 | BOARD | to approve NPRR1034 as recommended by TAC in the 1/27/21 TAC Report | Passed |
| 01/27/2021 | TAC | to recommend approval of NPRR1034 as recommended by PRS in the 1/14/21 PRS Report as amended by the 1/25/21 ERCOT comments. | Passed |
| 01/14/2021 | PRS | to endorse and forward to TAC the 12/10/20 PRS Report and Impact Analysis for NPRR1034 with a recommended priority of 2021 and rank of 3280 | Passed |
| 12/10/2020 | PRS | to table NPRR1034 | Passed |
| 11/11/2020 | PRS | to recommend approval of NPRR1034 as amended by the 10/22/20 SCT comments | Passed |
| 08/13/2020 | PRS | to table NPRR1034 and refer the issue to ROS | Passed |
Background
| Status: | Approved |
|---|---|
| Date Posted: | Jul 22, 2020 |
| Sponsor: | Southern Cross Transmission |
| Urgent: | No |
| Sections: | 4.4.4 and 4.4.4.3 (new) |
| Description: | This Nodal Protocol Revision Request (NPRR) creates new Protocol Section 4.4.4.3, Frequency-Based Limits on DC Tie Imports or Exports to allow ERCOT to establish import or export limits on Direct Current Ties (DC Ties) to avoid the risk of any unacceptable frequency deviation that may be identified in the event of an unexpected loss of one or more DC Ties when importing or exporting. Revisions to Section 4.4.4, DC Tie Schedules, would allow ERCOT to curtail DC Tie Schedules on a DC Tie on a last-in-first-out basis when necessary to address this risk. The last-in-first-out curtailment methodology is consistent with current practice documented in the ERCOT DC Tie Operating Procedure Manual. ERCOT would be required to post on the Market Information System (MIS) Public Area the operating conditions and associated limits that it would expect to use. |
| Reason: | Regulatory requirements: This NPRR is proposed in accordance with the May 23, 2017, order of the Public Utility Commission of Texas (PUCT) in Project No. 46304, Oversight Proceeding Regarding ERCOT Matters Arising Out of PUC Docket No. 45624 Relating to DC Tie Project Proposed by Southern Cross Transmission, LLC, which requires ERCOT to address a number of issues as a condition for the energization of the DC Tie project proposed by Southern Cross Transmission LLC (“Southern Cross Transmission”). As proposed, the Southern Cross DC Tie would be capable of importing 2,000 MW or exporting 2,100 MW. The PUCT’s Directive 9 in the order requires ERCOT to “evaluate what modifications to existing and additional Ancillary Services, if any, are necessary for the reliable interconnection of the Southern Cross DC tie.” ERCOT’s studies evaluating the potential need for Ancillary Services associated with the Southern Cross DC Tie identified a risk of unacceptable frequency overshoot in the event of the loss of the Southern Cross DC Tie when exporting above certain levels under certain operating conditions. ERCOT’s evaluation further identified likely future procurement of incremental Ancillary Services as a means to address the frequency overshoot concern. Southern Cross Transmission proposes this NPRR as a more efficient solution for the entire market by establishing limits on certain DC Tie transfers when necessary to address the risk of frequency overshoot, rather than requiring procurement of additional Ancillary Services. |
Key Documents
Jul 22, 2020 - doc - 88 KB
Aug 18, 2020 - xls - 127.5 KB
Aug 18, 2020 - doc - 94.5 KB
Sep 9, 2020 - xls - 124 KB
Sep 9, 2020 - doc - 41.5 KB
Oct 22, 2020 - doc - 77 KB
Nov 9, 2020 - xls - 125.5 KB
Nov 9, 2020 - doc - 42 KB
Nov 16, 2020 - xls - 129.5 KB
Nov 16, 2020 - doc - 100.5 KB
Dec 9, 2020 - doc - 58.5 KB
Dec 15, 2020 - xls - 129.5 KB
Dec 15, 2020 - doc - 102 KB
Dec 15, 2020 - docx - 28.8 KB
Jan 20, 2021 - xls - 130 KB
Jan 20, 2021 - doc - 105 KB
Jan 25, 2021 - doc - 83 KB
Feb 1, 2021 - xls - 116.5 KB
Feb 1, 2021 - doc - 108 KB
Feb 12, 2021 - doc - 108.5 KB