MON 21 SEP

ERCOT tightens RIOO RFI visibility for Batch Zero and community-impact answers; posts Question Reference Guides

What happened

ERCOT issued M-C092126-01 on Sep 21 at 8:46 p.m. covering RIOO RFI visibility changes and Question Reference Guides.
Batch Zero verification RFI: TSP and DSP cannot see ILLE or each other’s submissions; ILLE can see TSP/DSP responses; each party still sees its own.
Community Impact RFI: submitting TSP/DSP cannot see the developer’s responses; developer still sees its own.
Question Reference Guides posted for Load Types E, F, G, and Studied (guides dated Sep 18 on the Large Load Integration page) plus the community-impact guide.
PUCT Project 59142 Interchange Item 73 (ERCOT, LTRS, Sep 21) filed the process update; docket count 72 → 73.

Why it matters

Batch Zero verification responses (~231 pathways previously flagged) are due September 23. Visibility rules and published question guides change how ILLEs, utilities, and developers coordinate answers in the final days before that deadline and before the October 12 community-impact RFI due date.

What's next

September 23: Batch Zero verification RFI responses still due (~231).
September 24 9:30am: ERCOT Batch 1+ / Comprehensive Transmission Planning (CTP) Workshop #2.
October 12 5pm CPT: State and Community Impact RFI responses due (M-B091426-01).

Late Monday evening (September 21, 2026, 8:46 p.m.), the Electric Reliability Council of Texas (ERCOT) issued market notice M-C092126-01. After feedback at the September 11 Batch Zero Eligibility Verification request-for-information (RFI) workshop, ERCOT updated the Resource Integration and Ongoing Operations (RIOO) RFI tool so interconnecting transmission and distribution service providers (TSPs/DSPs) cannot see answers and uploads from the interconnecting large-load entity (ILLE) or from each other on the Batch Zero verification RFI, while the ILLE can still see TSP/DSP responses. For the Data Center State and Community Impact RFI, submitting TSPs/DSPs cannot see the data-center developer’s responses. ERCOT also posted Question Reference Guides for all four Batch Zero eligibility pathways and for the community-impact RFI on its Large Load Integration and related pages. The same day, ERCOT filed an update package on Public Utility Commission of Texas (PUCT) Project 59142 as Interchange Item 73 (file stamp September 21), titled “ERCOT UPDATE – BATCH ZERO ELIGIBILITY VERIFICATION AND STATE AND COMMUNITY IMPACT RFI PROCESS,” moving that docket from 72 to 73 filings.

Why it matters

Companies

CoreWeave
Nebius
HIVE
IREN
Hut 8
Core Scientific
Applied Digital
Bit Digital
TeraWulf
Cipher Digital
Riot
MARA
CleanSpark
Keel Infrastructure
Bitdeer

Risks

Restricting cross-visibility may reduce coordination errors but can also slow joint packages if parties cannot see counterpart filings.
Question Reference Guides are reference-only; the RIOO portal RFIs remain the controlling documents.
Missing the Sep 23 verification deadline can jeopardize conditional Batch Zero classification.

Sources

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