ERCOT Just Cracked 90 GW. Weather Isn't the Whole Story.

Summary

Amperon's ERCOT grid demand forecast surpassed 90 GW for the first time, and it's not just because of high temperatures.

Population growth and data centers have as much to do with record-breaking load as the weather.

Prices have stayed relatively moderate, indicating that ERCOT's generation buildout is, so far, keeping pace with high demand.

Today, July 22, 2026, ERCOT's forecast total load crests 90GW for the first time (90.5 GW at HE17, per our Amperon forecast), with temperatures forecast to hit 101.6°F that same hour. That's a milestone worth sitting with. But the headline "record heat, record load" undersells what's actually going on.

The heat explains the day, not the record

Yes, triple-digit temperatures are doing real work here. HE17's 101.6°F is genuinely hot, and ERCOT load tracks cooling demand closely on days like this. But compare today's numbers to the scatter plot below: ERCOT total load against temperature for every hour above 90°F since 2020. At 100-101°F, prior years in this sample topped out around 85 GW. Today's forecast pushes past that ceiling to 90.5 GW at essentially the same temperature.

*A scatter plot of historical temperatures vs. load in ERCOT shows that prior days over 100 degrees have produced load around 85 GW, as opposed to today's forecast of 90+ GW.*

That's the real story. It's not that today is unusually hot for Texas in July; triple digits happen most summers. It's that the same heat which used to produce an 85 GW day is now producing a 90+ GW day. The upward drift in the scatter shows the ceiling on ERCOT load climbing year over year at a fixed temperature. Weather sets the shape of the curve; something else has been raising the floor underneath it.

Three forces, one direction

Heat still matters. Triple-digit July afternoons push residential and commercial AC hard, and ERCOT's summer peak has always tracked cooling demand closely. That hasn't changed.

Population and housing growth compound it. Texas keeps adding people and rooftops faster than almost any other state, and each new household adds AC load that didn't exist five years ago. This is a steady, unglamorous driver, but it shows up in the baseline every summer.

Data centers are the new marginal load. This is the piece that's different from 2020. Hyperscale campuses, AI training clusters, and crypto-mining operations have been landing across Texas at a pace the grid hasn't seen before, and unlike AC load, this demand doesn't cycle off overnight or ease up in the shoulder seasons. It's flat, large, and growing. That's what's pulling the whole load duration curve upward, not just the summer peak.

The market isn't panicking

Here's the part that should reassure people watching from the trading side: day-ahead prices at the North hub didn't blow out. HE21settled at $237.83/MWh, a real scarcity premium, but nowhere near ERCOT's$5,000/MWh cap, and nowhere near the kind of pricing we've seen in past tight-reserve events. The market priced in a stressed hour, not an emergency.

That's a meaningful signal. It suggests the incremental generation and reserve margin ERCOT has brought online is, so far, keeping pace with this new baseline of demand. Prices moving up modestly rather than spiking to the cap is the market telling us this looks manageable, for now.

What this means going forward

90 GW likely won't stand as a record for long. If datacenter buildout continues at its current pace and population growth holds, we should expect ERCOT to test new highs again this year and set a materially higher one next summer. The question worth tracking isn't whether the next record comes. It's whether reserve margins and new generation keep growing fast enough to keep day-ahead prices behaving the way they did this week.