NOTICE DATE: October 2, 2026

NOTICE TYPE: M-C100226-01 Release

SHORT DESCRIPTION: RIOO Maintenance Release

INTENDED AUDIENCE: Interconnecting Large Load Entities with projects conditionally included in Batch Zero, Developers of Data Centers 25 MW and Larger, Transmission and/or Distribution Service Providers, and Market Participants

DAYS AFFECTED: October 5, 2026, 8:30 AM - 9:30 AM

LONG DESCRIPTION: The Resource Integration and Ongoing Operations (RIOO) system will be unavailable on October 5, 2026 between 8:30 AM to 9:30 AM for a maintenance release.

CONTACT: For technical issues accessing or using the RFI portal in RIOO, TSPs, DSPs, ILLEs, and data center developers should contact the ERCOT Service Desk at ServiceDesk@ercot.com.  TSPs and DSPs registered as ERCOT Market Participants may also contact ERCOT Client Services at (512) 248-3900 or email ClientServices@ercot.com. Questions about the Batch Zero Eligibility Verification RFI or the process for completing that RFI can be directed to LargeLoadVerification@ercot.com. Questions about the Data Center State and Community Impact RFI or the process for completing that RFI can be directed to DataCenterImpact@ercot.com.

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