A primer for Texas businesses on the grid that powers 90% of the state — and why the rules here are unlike anywhere else.
If you run a business in Texas, you live inside one of the most distinctive electricity markets in the world. The Electric Reliability Council of Texas — ERCOT — manages the flow of roughly 90% of the state’s power, serving more than 27 million customers across more than 75% of Texas’s land area. And unlike almost every other major grid in North America, ERCOT operates as its own independent island, largely isolated from the Eastern and Western Interconnections that knit the rest of the country together.
That isolation isn’t an accident. It’s a deliberate choice that goes back nearly a century, designed to keep Texas’s grid out from under federal jurisdiction. The practical effect today: Texas writes its own rules, runs its own market, and lives with the consequences — both good and bad — without leaning on neighboring states for backup the way other regions can.
Over the next ten weeks, we’re going to walk through the ERCOT market in plain language: how prices are set, what’s driving the explosive demand growth from data centers, how summer and winter reliability really work, what Senate Bill 6 means for large customers, and how businesses can position themselves to control costs as the grid undergoes the biggest transformation in its history.
The Three Things That Make ERCOT Unique
1. It’s an energy-only market
Most U.S. grids pay generators twice: once for the electricity they actually produce, and again — through a capacity market — just for being available when needed. ERCOT pays only for energy produced. That keeps wholesale prices low most of the time, but it also means generators have to earn their entire return during periods of high demand. When summer afternoons get tight, prices can spike from $30 per megawatt-hour to thousands per megawatt-hour in a matter of minutes.
2. It’s deregulated at the retail level
In most of ERCOT’s territory, you don’t buy power from a utility — you buy it from a Retail Electric Provider (REP) that competes for your business. The wires company (Oncor, CenterPoint, AEP, TNMP) still delivers the electricity, but the commodity itself is a competitive product. That’s why a Texas business can shop, negotiate, and lock in fixed rates — an option most of the country simply doesn’t have.
3. It’s growing faster than any grid in the country
ERCOT’s all-time peak demand record is 85,508 MW, set on August 10, 2023. The grid operator’s preliminary long-term forecast projects demand could reach 367,790 MW by 2032 — more than four times today’s record. ERCOT itself has cautioned that this number is likely overstated, but even the more conservative working estimates point to historic load growth driven primarily by data centers, AI compute facilities, and large industrial expansion.
Bottom line: ERCOT is a free-market, energy-only, fast-growing grid operating on its own island. Every other piece of analysis in this series flows from those three facts.
What This Means for Your Business
If you’re a commercial or industrial customer in Texas, ERCOT’s structure creates both opportunity and risk. The opportunity is choice — you can shop suppliers, structure contracts to match your load profile, and avoid being locked into whatever the local utility decides to charge. The risk is volatility — when supply tightens, prices move fast, and customers on the wrong contract can see bills they never imagined.
Over the coming weeks, we’ll dig into how to read those signals, how to negotiate from a position of knowledge, and how to think about the next five to seven years of contracting decisions.
Take the Next Step
Want to understand how ERCOT volatility affects your specific facility? Amerigy Energy works with Texas commercial and industrial customers to structure electricity contracts that match real-world load patterns. Reach out to set up a no-obligation review.