The 2025 law was written for data centers — but its consequences will reshape the market for every commercial and industrial customer.
When the Texas Legislature passed Senate Bill 6 in the 2025 session, much of the public conversation focused on data centers and cryptocurrency miners. Both deserve the attention — they account for the lion’s share of the new large-load growth ERCOT is trying to plan for. But the law itself has implications that reach well beyond those specific industries.
SB 6 created the legal framework for ERCOT and the Public Utility Commission to identify, verify, and incorporate large-load demand into long-term planning, and to require certain large customers to be curtailable during emergency conditions. The April 2026 long-term load forecast filing was the first time ERCOT used the SB 6 process to calculate upcoming load growth.
What SB 6 Actually Does
Three things, in plain language:
- It requires transparency. Large prospective customers — the threshold lands in the 75 MW and above range, with separate provisions for medium-sized loads of 25 MW or more — must provide information about their projects so ERCOT can plan around them, rather than discovering them at the interconnection stage.
- It introduces curtailment expectations. Certain large loads, particularly those with at least 50% backup generation or co-located generation, are now expected to be curtailable during specific emergency conditions. This effectively trades some operational guarantee for the ability to interconnect at a faster pace.
- It changes how the planning forecast is built. ERCOT now blends its base economic forecast with information provided by transmission and distribution providers like Oncor, AEP, and Texas-New Mexico Power. The first run of this process produced the headline-grabbing 367,790 MW projection that ERCOT itself flagged as likely overstated.
Why It Matters Even If You’re Not a 75 MW Customer
If you’re a typical Texas business — a manufacturer, hospital, school district, retail chain, office park, agricultural operation — you don’t fall under the SB 6 large-load definition. So why should you care?
1. Planning visibility benefits everyone.
If ERCOT and the PUC have a clearer picture of where large new loads will land, they can build transmission, signal generation needs, and run reliability assessments more accurately. Better planning means lower long-term costs for all customers, because expensive scrambling — emergency capacity procurement, last-minute transmission upgrades, premium pricing for reserve adequacy — gets reduced.
2. Transmission cost allocation is being rewritten.
When billions of dollars of new transmission gets built primarily to serve specific new load centers, the question of who pays becomes politically charged. SB 6 and related PUC proceedings are actively shaping that allocation. The outcome will affect what your delivery charges look like for the next decade.
3. The curtailment framework creates a new market signal.
If large loads are increasingly expected to be curtailable, the value of being a non-curtailable customer goes up. That has implications for how reliability risk is priced into your contracts and into the broader market.
4. The data center build-out itself is being reshaped.
SB 6 makes Texas a less casual place to drop a multi-hundred-megawatt facility. Some of the projects in the 243,000 MW pipeline will not get built — they’ll get redirected to other states or canceled entirely. That’s part of what ERCOT means when it says the preliminary forecast is likely overstated. The market clearing process is happening now.
What to Watch Going Forward
ERCOT plans to issue a revised long-term forecast incorporating refinements to the SB 6 process. The PUC has signaled it wants to engage in that refinement, with PUC Chair Thomas Gleeson noting the agency needs to look at ways to refine the number into something more usable for reliability and transmission planning.
For businesses, the practical implication is simple: the rules of the Texas electricity market are being actively rewritten right now. Forward energy prices, transmission cost allocations, and reserve adequacy planning are all being reshaped by SB 6 and the related rulemakings. Anyone signing a multi-year contract today should understand which of those risks are baked into the price and which sit with the customer.
SB 6 is one of the most consequential pieces of Texas energy legislation in years. Even if you’ll never read the full text, you’ll feel its effects in your bills.
Take the Next Step
Want a plain-language briefing on how SB 6 and related PUC actions could affect your specific contract or facility? Amerigy Energy stays current on the regulatory landscape and translates it into practical contracting decisions. Reach out for a no-pressure conversation.