Texas ERCOT: mining as interruptible demand, not a factory that never sleeps

Texas is often sold as the place you go because electricity is cheap and the politics are friendly. Both can be true in a given month. Neither is the mechanism. The mechanism is ERCOT: an isolated, energy-only wholesale market with violent price spikes, a large and growing share of wind and solar, and programmes that pay flexible loads to disappear when the grid is tight.

A miner is a breaker, not a smelter

An aluminium line or a data-centre training cluster hates being turned off. A Bitcoin miner does not. Hashrate is interruptible in seconds. That makes mining look, to a grid operator, more like a demand-side battery than like a factory. ERCOT treats large flexible loads as resources that can buy cheap — sometimes negative — overnight wind, and drop off in the late-afternoon scarcity window when air-conditioning and the solar ramp collide.

There is a second, duller Texas instrument: 4CP, the four coincident peaks. Transmission charges for the following year depend on a site’s draw in the single highest 15-minute interval of June, July, August, and September. Miss those four intervals on purpose and you change the all-in tariff. Hit them by accident and you punish yourself for twelve months. This is not crypto folklore. It is how ERCOT industrial customers have been billed.

When switching off paid more than hashing

Riot Platforms’ Texas operations became the textbook. In the August 2023 heat, the company told the SEC it had curtailed more than 95 percent of power use at peak. That month it reported about $31.7 million of curtailment credits and demand-response value against roughly $8.9 million of bitcoin mined. Switching off was the trade. Subsequent years were less cinematic but the same business: tens of millions of dollars a year in credits, enough in some periods to move the firm’s net power cost by a cent or more per kilowatt-hour.

Earlier, in July 2022, local reporting had Riot taking on the order of $9.5 million of power credits for curtailing about 11,700 megawatt-hours during an all-time demand month — more than the bitcoin it gave up. The pattern is stable even when the numbers change: in ERCOT, the option to not mine is an asset.

What is changing

The same campuses are now being remarked as AI and high-performance computing. Hyperscalers pay more per megawatt and want higher uptime. ERCOT’s large-load queue in 2026 was dominated by data-centre requests measured in the hundreds of gigawatts of interest, not of built kit. If miners convert halls to always-on GPU clouds, the “emergency brake” they sold the grid gets thinner. That is not an argument against Texas. It is an argument to read the interconnection and the offtake before you copy a 2022 slide deck.

What to copy — and what not to

• Copy interruptibility. If your power is surplus, curtailed, or peak-constrained, the miner must be first off, in writing.
• Copy market literacy. Index power, demand response, and transmission peaks are the product. A flat retail tariff is a different animal.
• Do not copy a headline cents-per-kWh from someone else’s 4CP-avoided, credit-stacked year.
• Do not assume a US industrial site is ERCOT. Nebraska is not Texas. The contract still has to name who dumps load, and when.

NexusArc places client-owned miners at a partner site in Nebraska and at other partner sites in India, Nigeria, and Russia. We do not pretend every jurisdiction is ERCOT. We do insist that hosting terms say what happens when the watts are scarce. For generators, the Texas lesson is the same sentence we use in energy mandates: mining is flexible demand, or it is a mistake.