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Data Centers & Large Load

ERCOT Data Center Load and Commercial Electricity in Texas: The 4CP Risk Buyers Are Missing

| 7 min read

Most Texas commercial electricity buyers read data center announcements as someone else's story. In 2026, that framing breaks. ERCOT's large-load interconnection queue has reached roughly 410 GW, with data centers making up about 87% of the new requests, according to ERCOT's April 2026 large-load update. The grid's all-time peak demand sits at about 85 GW, set in August 2023. Even if a fraction of the queue actually energizes, the impact on summer peaks, transmission charges, and wholesale prices flows through to every commercial buyer on the system. The risk is not only volatility. It is structural: 4CP transmission cost allocation rises with the peak, and most commercial contracts do not protect against it.

What Happened: The Queue Doubled in Under a Year

ERCOT's large-load queue jumped from 169.6 GW in May 2025 to roughly 410 GW by April 2026, a 2.4x increase driven almost entirely by AI hyperscale and colocation operators. Oncor's territory alone holds 273 GW across 650 active requests, more than three times ERCOT's entire grid peak. Most of this load is concentrated in West Texas, the Permian, and DFW exurbs.

The Texas Legislature responded with Senate Bill 6 (2025), which moved ERCOT off first-come, first-served interconnection. Loads above 75 MW now must post financial commitment, prove site control, and cover their own direct interconnection costs rather than socializing them across ratepayers. SB 6 cleared an estimated 40% of speculative projects from the queue by Q1 2026, but the remaining requests still dwarf historical demand.

The PUCT followed with Project No. 59142, directing ERCOT to develop a Batch Study process for large-load interconnection. Batch Zero is targeted for ERCOT Board consideration on June 1, 2026. The shift from individual to batched studies is intended to manage backlog without further compressing study timelines for legitimate projects.

Why This Hits Non-Data-Center Commercial Buyers

If your business is not building a data center, the queue still matters in three concrete ways: 4CP transmission cost allocation, contract renewal pricing, and demand response economics. Each works through a different mechanism, but all three move in the same direction as data center load grows.

4CP exposure is the under-discussed risk. ERCOT's Four Coincident Peak (4CP) program allocates transmission costs based on each commercial customer's demand during the four highest 15-minute grid intervals across June, July, August, and September. According to GridBeyond's 4CP analysis, those four intervals out of 8,760 annual hours can drive 30-40% of a commercial customer's total bill through TDU transmission charges. As data center load lifts the entire grid peak, the absolute value of 4CP-allocated transmission costs grows. Even if your facility's demand profile does not change, the dollars charged per kW of 4CP demand rise.

Renewal pricing reflects forward heat-rate risk. Index and pass-through contracts feel volatility immediately. Fixed-rate buyers feel it at renewal. Amperon's 4CP analysis notes that summer peak settlement prices increasingly drive forward-curve pricing for 2027-2028 strips. REPs hedge their exposure when they price your fixed product. If they expect tighter summer afternoons, that cost shows up in your renewal quote.

Demand response economics improve. Businesses with curtailable load (HVAC pre-cool, process cooling, lighting, EV charging) can monetize flexibility through Emergency Response Service (ERS) and 4CP avoidance. As reserve margins tighten, both ERS payments and 4CP savings get larger.

The Texas Commercial Buyer's AI Load Surge Checklist

This is the practical work to do before your next renewal cycle. Each step takes 30-60 minutes and surfaces information your REP or broker should already have.

Step 1. Identify your contract type

Pull your most recent contract and confirm whether you are on fixed, index, block-and-index, or pass-through. Each handles ERCOT volatility differently. Fixed insulates you until renewal. Index passes wholesale moves through monthly. Block-and-index splits exposure. Pass-through gives you direct ERCOT settlement risk.

Step 2. Audit your 4CP exposure on a recent bill

Ask your REP for a line-item breakdown of TDU charges, transmission charges, and any 4CP rider. Calculate the percentage of your monthly cost driven by transmission. If it is above 25%, you have meaningful 4CP exposure.

Step 3. Check for demand charge riders

Scan your contract for riders tied to "ERCOT peak events," "RTC pricing," or "ancillary service pass-through." These are the clauses that can surprise you during high-priced afternoons. Get a written explanation of how each is calculated.

Step 4. Build your REP ask list

Send the five questions in the next section to your REP and require written answers. Vague responses are a signal to get a competing quote.

Step 5. Evaluate hedging and demand response

If your contract renews in the next 12-18 months, model a 2-3 year fixed term against a block-and-index structure. Get an ERS qualification check from your REP if you have flexible load above roughly 100 kW.

Five Questions to Ask Your REP or Broker This Quarter

  1. How is our current contract structured to handle increasing 4CP demand charges as Texas grid peaks rise? The answer should reference whether 4CP is fixed in your TDU pass-through or floats with annual rate cases.
  2. Does our rate include any demand charge rider tied to ERCOT peak events, and can we see historical cost breakdowns for the past 12 months? If they cannot produce the breakdown, escalate.
  3. What index or real-time exposure do we have during summer afternoons (3-7pm CT) when data center load is highest? Specifically ask about RTC and ancillary service pass-through after ERCOT's RTC+B implementation.
  4. Is there a demand response or load curtailment option (ERS, ECRS, 4CP avoidance) we could activate during high-price events? Get the qualifying load threshold and historical payment data.
  5. What is the renewal outlook for our contract type in a tightening Texas supply environment, and what would a 2-year vs. 3-year fixed term cost today? Insist on both quotes in writing.

FAQs

How does ERCOT's data center load growth affect my commercial electricity bill?

Indirectly but materially. Data center load lifts grid peaks, which raises 4CP transmission charges allocated to all commercial buyers. It also pushes forward-curve prices higher, which REPs price into renewal quotes. Index-rate buyers see it first; fixed-rate buyers see it at the next renewal.

What is 4CP demand and why does it matter when data centers add load to the Texas grid?

4CP (Four Coincident Peak) is ERCOT's method for allocating transmission costs based on a customer's demand during the four highest 15-minute grid intervals each June through September. As data centers raise overall grid peaks, the dollar value of every kW of 4CP demand increases, raising bills even for businesses whose own usage profile is unchanged.

Should Texas commercial buyers switch from index to fixed rates because of data center growth?

It depends on contract horizon and risk tolerance. Fixed locks in current forward-curve pricing, which already reflects expected data center buildout. Index keeps optionality but exposes you to monthly volatility. Block-and-index is a middle path: hedge a base load layer fixed, leave the rest indexed. The right answer is a quantitative comparison with your REP using your specific load profile.

What is ERCOT's large-load interconnection queue and why has it grown so fast?

It is the pipeline of facilities (typically above 75 MW) requesting a grid connection. Growth is driven primarily by AI hyperscale data centers chasing low Texas power prices and permissive siting. The queue grew from about 64 GW at the end of 2024 to roughly 410 GW by April 2026.

How much of Texas electricity is generated by natural gas?

Natural gas remains the largest single fuel source on ERCOT's operational mix, typically around 45-50% of generation depending on season and weather. Wind and solar contribute most of the renewables share, with battery storage growing rapidly inside ERCOT's interconnection queue. For real-time fuel mix, the ERCOT generation dashboard publishes the current share live.

If you want to compare commercial plans by contract type and term length, start with our Texas commercial electricity rates overview.