ERCOT 474 GW Audit: EIA Cuts Regional 2027 Sales Forecast 4.7%

September STEO Narrows Regional Growth

EIA's September Short-Term Energy Outlook forecasts 761 billion kWh of 2026 electricity sales and 790 billion kWh in 2027 for the West South Central census division. The 2027 figure is down from 829 billion kWh in EIA's August outlook. KilowattLogic calculates that revision as a 39 billion kWh, or about 4.7%, reduction.

The current September forecast still rises by 29 billion kWh from 2026 to 2027, about 3.8%. EIA says the West South Central region remains the largest contributor to national electricity-demand growth despite a pause in some new Texas data-center projects. The census division includes Texas, Louisiana, Oklahoma, and Arkansas, so these values are neither Texas-only nor an ERCOT system-demand forecast.

The August Audit Changes the Planning Signal

Governor Greg Abbott's August 3 order directs the PUCT, ERCOT, and other state agencies to audit proposed data-center projects before they move forward. The order cites approximately 474 GW of large-load requests under consideration, roughly 90% tied to data centers, and asks for project-level information on generation, water, incentives, and ownership. It does not say 474 GW has been approved or will energize.

EIA's August Short-Term Energy Outlook supplied an earlier Texas-only signal: forecast 2027 electricity-load growth of 6%, down from 14% in July. KilowattLogic calculated that as an 8-percentage-point, or about 57% relative, reduction. The September regional sales forecast now provides the fresher directional checkpoint, but the measures and geographies differ and should not be spliced into one continuous series.

410 GW, 438 GW, and 474 GW: Point-in-Time Snapshots

ERCOT's large-load figures are best read as queue pressure, not a load forecast. The April 9 House State Affairs presentation showed approximately 410 GW of large loads seeking interconnection. ERCOT's June 18 Batch Zero explainer moved the public queue context to more than 438,000 MW of proposed demand, nearly 90% from data centers. The August 3 state order then cited approximately 474 GW of requests. Because scope, timing, and verification can differ, the sequence should not be treated as a validated growth series.

That distinction matters for readers arriving from search. A large queue can still affect planning, transmission studies, generation siting, and commercial procurement, but it should not be described as confirmed demand. The cleaner buyer question is: which requests become substantiated load, which are filtered by SB 6 and financial-security rules, and which remain speculative.

Senate Bill 6: The Filter

Texas's primary regulatory response is Senate Bill 6 (SB 6), passed during the 2025 legislative session. SB 6 establishes a framework for regulating large-load customers with peak demand of 75 MW or more, a threshold aimed at very large campuses rather than most ordinary commercial accounts:

• Financial Security: The PUCT has proposed $50,000 per MW in financial security in 16 TAC 25.194. For a 500 MW site, that would equal $25 million before any other project-specific costs.
• Project Substantiation: ERCOT and transmission providers are moving toward stronger evidence that a requested load has financing, site control, timeline, and interconnection readiness.
• Planning Standards: Large-load treatment can affect reliability studies, transmission planning, energization timing, and potential cost-allocation debates.

Large-Load Due-Diligence Map

ERCOT's public materials describe load type, timing, and interconnection pressure, but they do not publish a definitive top-10 data-center ranking for commercial buyers. Rather than imply project-level certainty, this page uses a due-diligence map: zones and questions that procurement teams can verify against current ERCOT, PUCT, TDU, and supplier materials.

This table intentionally avoids naming unverified project rankings. ERCOT's official materials support the system-level queue and forecast context; project-specific claims should be verified against current interconnection, TDU, and public-company disclosures before being used in customer advice.

Texas Legislature Takes Notice

The Texas House Committee on State Affairs held April 2026 hearings that touched three buyer-relevant dimensions of large-load growth:

• Grid Reliability: Whether ERCOT's current reserve margins can accommodate the scale of new load without compromising reliability for existing residential and commercial customers.
• Long-Term Infrastructure Planning: The need for new generation capacity, including the state's $350 million fund for nuclear energy development and proposals for 765-kV transmission lines to serve the Permian Basin and other industrial corridors.
• Water Resources: Data center cooling systems consume significant water, particularly in operations that don't use closed-loop or adiabatic cooling. In drought-prone West Texas, water availability may become the binding constraint before electricity.

Those hearings do not create a direct rate outcome by themselves, but they show why large-load policy, water constraints, and cost allocation are becoming part of Texas energy procurement due diligence.

ERCOT's Batch Study Process

To manage the volume of requests, ERCOT moved from case-by-case interconnection studies to a batch study process. Batch Zero became effective July 11, 2026. After suspending the expected August 7 release and missing its August 31 target, ERCOT notified interconnecting utilities of provisional classifications on September 3. Inclusion can remain conditional on verification, model-data cures, or a PUCT exception. ERCOT published no aggregate qualified-load or MW total. Eligibility and community-impact reports remain scheduled for December 10; provisional classification and QSA inclusion do not authorize a project to energize.

The Large Load Integration page set July 10 and July 24 submission milestones for interconnecting entities and transmission providers. Those milestones are historical process filters, not proof that any given data-center campus will energize. The separate Batch Zero status page tracks current classification conditions, dispute paths, verification, and the eventual final result.

For commercial buyers, the audit and batch process matter because they can separate near-term substantiated load from earlier-stage requests. Verified project readiness and future ERCOT load forecasts are more useful than any raw queue snapshot when evaluating delivery charges, congestion exposure, and supplier contract terms.

Commercial Buyer Action Items

• Monitor TUOS and TDU Tariffs: Transmission Use of System charges and delivery tariffs are where many infrastructure costs become visible to commercial accounts.
• Refresh 4CP Strategy: Use current interval data, not last year's assumptions, to decide whether the facility can reliably curtail during likely coincident peaks.
• Evaluate Demand Response Fit: Flexible facilities should ask REPs or QSEs which programs match their operational constraints before assuming revenue potential.
• Track PUCT Rulemaking: SB 6 implementation and 16 TAC 25.194 can shape which large-load requests become real planning inputs.