2 - NPRR1234 and PGRR115 - Overview and Key Concepts Agee Springer
NPRR1234 and PGRR115 to replace NPRR1191, PGRR111, and related revision request
Implement change in direction announced at April 1st large load task force meeting
Significant changes and new concepts in NPRR1234 and PGRR115
Presentation covers three things: significant changes in NPRR1234 and PGRR115, and appendix with section-by-section changes in protocols and planning guides
NPRR1234 replaces NPRR1191
2.1 - Overview of Significant Changes in NPRR1234 and New Modeling Requirements - Agee Springer
Agee Springer presented a detailed overview of significant changes in NPRR1234 and new modeling requirements.
Changes in NPRR1234:
Implemented a new approach, eliminating concepts from NPRR1191.
Large loads no longer have ramping limitations and voltage drive requirements.
ERCOT expressed concerns about ramping and VRT issues.
Proposed exploring additional solutions such as AS procurement or other system improvements.
Draft replacement in section 3.10.7.2:
Identifies and requires certain loads to be included in the ERCOT network operations model.
Aims to identify load points or collections of load points at substations serving single sites with historical or expected peak demand of 25MW or greater.
Applies to sites behind the meter of a generation resource.
Primary end uses to be identified from a list of broad categories for load forecast and situational awareness, without intent of public disclosure.
Several clarifying examples provided to illustrate this concept.
Responsibility and applicability:
The entity that modeled the load is responsible for adding the additional detail to the model.
Discussed thresholds for identification applicability, with loads exceeding the 25MW threshold to be identified within a certain timeline.
Questions raised about identifying sites, responsibility for identification, inclusion of battery energy storage, and energy storage load.
Clarifications provided regarding intended entities for identification and distinction between loads and energy storage.
Feedback invited on the draft end-use classification categories.
PGRR115 replaces PGRR111 and introduces new concepts and significant changes.
The large load interconnection study process will apply to all large load interconnection requests regardless of the initial energized date, aligning the process closer to the generation interconnection process.
Interactions in the process will be between the interconnecting TSP and, for behind the meter requests, the interconnecting entity or resource entity.
Large load interconnection requests going through this process will also go through the quarterly stability assessment prior to initial energizing.
Concerns were raised about retroactive application of the process and potential impact on businesses, but it was clarified that projects already in the interim interconnection process have been included in the QSAs.
Language changes in PGRR115 include updates on when large loads can be included in the network operations model and removal of language on loads intending to register as a controllable load resource.
Additional language was added to clarify conditions triggering a partial or full re-study for changes to the project or transmission system.
NPRR and PGRR focus on the new interconnection process and identifying larger facilities in the ERCOT network operations model.
2.3 - Appendix - Summary of NPRR1234 and PGRR115 by Section
NPRR1234 changes sections regarding modeling information for loads now collected from TSPs rather than through RIOO.
Changes align with previous public pivot.
Planning Guide Revision includes changes related to the steady-state working group and operations model for adding a large load.
Discussion around lack of specific dynamic model requirements for loads.
Concerns raised over lack of specific language for load dynamic models and implications for reliability.
Request for specific data fields for load dynamic models.
Shift of responsibility on TSPs for providing data previously handled by IILLE.
Need for clear requirements for existing loads and time for compliance.
Request for glossary of fields needed for load and study similar to the resource registration glossary for generation.
Significant increase in approved energization of large loads, approximately 1GW
Planning studies for another 1GW of load approved
Concerns raised about large loads requiring single grid connection
Lack of criteria for limiting the size of single connection
Potential issues with frequency stability and voltage swings with large loads
Question raised about inclusion of megawatts in the Dallas Fort Worth study
Need for criteria/guidelines for LLI at different voltage levels
Potential stress on the grid and system due to large load interconnections
Consideration for grid stress and potential impact during significant storms
4 - Additional Items - Bill Blevins - Bob Wittmeyer
Bill Blevins mentions the emergence of issues regarding planning for extreme events like -7, -10, and -12 weather events, and the impracticality of designing for such extreme scenarios.
Discussion about the need for criteria and rule development to address these extreme events.
Discussion about the responsibility for large load interconnection study requirements, with the TSP ultimately being responsible and varying expectations for PSCAD model requirements among TSPs.
Mention of ERCOT's requirement for SSO study and the need for composite load models in the interconnection process.
