GRIDINT Research · Energy

The grid, under load.

Every hour of the last thirteen months, the American grid reported what it was carrying — and this summer it carried more than at any other point in those thirteen months. This report reads the government's own hourly demand record: the nation's load as a heat calendar, the daily peaks of thirteen regions side by side, and the two great data-center regions — Texas pulling ahead, the mid-Atlantic quietly defying the story. Every figure is EIA's own, hour-stamped.

published 2026-08-27 · data cutoff 2026-08-26 · edition 1 — updated only by a new dated edition

THE CALENDAR

A year of hours, one picture.

Each column is a day, each row an hour (UTC). Color is national demand — cool cyan at the quiet hours, burning coral at the peaks. The picture reads itself: the daily breathing of a continent (dark early-morning bands, hot evening bands), the two seasonal waves of summer and winter — and this summer burning wider and hotter than the last.

A1US48 demand — 396 days × 24 hours, every cell an hour
WHAT YOU ARE LOOKING AT A calendar heatmap of hourly electricity demand for the lower-48 grid. ~9,500 cells, one per reported hour; the color scale runs cyan → amber → coral across the demand range. Tap or hover any cell for its exact megawatt-hours and timestamp.
sourceEIA Hourly Electric Grid Monitor · series EBA.US48-ALL.D.H · UTC methodno smoothing; missing hours render as gaps, not guesses
THE REGIONS

Thirteen grids, one summer.

The national number hides the geography. Below, every regional grid's daily peak demand for thirteen months, drawn to its own scale — and then the comparison that matters: Texas and the mid-Atlantic, the two great data-center regions, against everyone else — and the two do not tell the same story, which is exactly why the compare exists.

B1Daily peaks, region by region — small multiples
WHAT YOU ARE LOOKING AT Thirteen sparklines, one per grid region, each showing daily peak demand over ~13 months, scaled to its own range (the number at right is the window's maximum). Shape is what matters here: every region breathes with the seasons, but the amplitude and the trend differ.
sourceEIA · EBA.<region>-ALL.D.H · daily max of reported hours
B2The data-center states vs the rest — indexed to last summer
WHAT YOU ARE LOOKING AT Monthly average of daily peaks, indexed to each group's value 12 months ago (=100). Texas (ERCOT) and the mid-Atlantic (the region hosting the Virginia data-center corridor) are drawn hot; the aggregate of the other eleven regions is the gray line. A gap that widens is growth you can't explain with weather alone — and the method note says exactly what this can and cannot prove.
sourceEIA hourly demand, aggregated by GRIDINT methodindex = month's mean daily peak ÷ same month last year × 100; weather is NOT controlled for — this chart shows growth, not attribution; the data-center linkage is context from LBNL/DOE, stated, not derived here
METHOD

What this is, and what it cannot say.

The data: the EIA's Hourly Electric Grid Monitor bulk file — demand by balancing-authority aggregate, UTC hourly, 396 days retained here. We never create data and never provide it: the hourly record is EIA's, the download on the hub is a verification extract, and every tooltip carries the series ID so you can pull the same numbers yourself. The limits: demand is not consumption by sector — the hourly record cannot say which megawatt went to a data center; that attribution lives in the LBNL/DOE studies cited on our power hub, and this report keeps the two kinds of claim separate. Timestamps are UTC, so local evening peaks appear shifted; missing reported hours are drawn as gaps. Analysis is labeled as analysis; the record is the record.

FINDINGS

Four things the hourly record shows.

1The window’s record hour landed this summer. The single hottest hour of the window — 761,177 MWh of national demand — landed in July 2026, and the calendar shows this summer's hot band running wider and deeper than last year's. → the calendar, A1
2A continent breathes in unison. The heatmap's horizontal banding — cool early-UTC hours, burning evening rows — is every household and factory keeping nearly the same rhythm; the seasonal waves ride on top of a daily pulse that never breaks. → A1
3Texas is a nation-scale grid on its own. ERCOT's peak hour, 91k MWh, would rank it among the largest national grids anywhere — and its summer amplitude dwarfs its winter, the signature of an air-conditioning-driven, fast-growing system. → the multiples, B1
4Texas grows ahead — and the mid-Atlantic quietly defies the narrative. In the last full month, Texas ran +3–4% above the same month last year while the mid-Atlantic — home of the Virginia data-center corridor — came in BELOW its own prior year. The hourly record cannot separate weather from wafers, and this report says so rather than claiming it; the attribution lives in the LBNL studies on our power hub. → the index, B2
A GRIDINT RESEARCH REPORT · ENERGY · AUTHORED FROM OFFICIAL RECORDS · RENDERED BY THE GRIDINT BUILDER
published 2026-08-27 · data cutoff 2026-08-26 · edition 1 — updated only by a new dated edition

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