Hourly Historical System Load

Hourly weather-zone actual-load history for ERCOT, including the eight weather zones and a system total.

Load data

Download data Open on map

Native record

event_time

hourly publication cadence

Evidence

Observed market data

Published observations from the named source

In Ask the Grid

Zones on the ERCOT map

Values for the live grid surface

Overview

Use it for zonal and historical hourly analysis; for current system-wide demand and intraday forecast error, prefer Current Supply, Demand & Intraday Forecast (ercot_supply_demand). Analysts use this archive to study load shape and peaks, normalize demand against temperature, and contextualize price moves and reserve conditions. It comes from ERCOT report NP6-345-CD.

Query contract

Preserve one canonical row per (event_time) before aggregating.

Analysis rules

Group only after preserving the declared grain: event_time.

Related analysis

current system-wide demand and intraday forecast error · aggregate compatible intervals to the same hour

Interpretation

For current system-wide demand, use series='realized' from ercot.supply_demand. This hourly table remains useful for weather-zone and historical-hour analysis.

Schema14

Column

Type

event_timeDateTime64(6, 'UTC')

coast_mwNullable(Float64)

east_mwNullable(Float64)

far_west_mwNullable(Float64)

north_mwNullable(Float64)

north_central_mwNullable(Float64)

south_central_mwNullable(Float64)

southern_mwNullable(Float64)

west_mwNullable(Float64)

system_total_mwNullable(Float64)

dst_flagNullable(Bool)

emil_idNullable(String)

doc_idNullable(Int64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	coast_mw	east_mw	far_west_mw	north_mw	north_central_mw	south_central_mw	southern_mw	west_mw	system_total_mw	dst_flag	emil_id	doc_id	ingested_at
2026-09-25 02:00:00.000000	19406.22	2506.91	7669.34	2110.8	22059.68	13231.9	6227.53	2310.08	75522.46	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-25 01:00:00.000000	19986.21	2621.93	7576.39	2223.48	22855.74	13741.32	6388.14	2277.73	77670.94	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-25 01:00:00.000000	19986.21	2621.93	7576.39	2223.48	22855.74	13741.32	6388.14	2277.73	77670.94	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-25 00:00:00.000000	20675.29	2732.73	7524.52	2290.57	23682.71	14143.49	6470.13	2379.18	79898.62	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-25 00:00:00.000000	20675.29	2732.73	7524.52	2290.57	23682.71	14143.49	6470.13	2379.18	79898.62	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 23:00:00.000000	21796.76	2696.46	7637.81	2390.94	24546.89	14467.1	6675.71	2431.69	82643.37	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 23:00:00.000000	21796.76	2696.46	7637.81	2390.94	24546.89	14467.1	6675.71	2431.69	82643.37	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 22:00:00.000000	22318.4	2686.15	7698.76	2395.11	24760.09	14337.88	6699.32	2531.18	83426.9	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 22:00:00.000000	22318.4	2686.15	7698.76	2395.11	24760.09	14337.88	6699.32	2531.18	83426.9	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 21:00:00.000000	22206.17	2691.84	7743.6	2344.51	24254.98	13976.13	6625.12	2474.38	82316.74	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 21:00:00.000000	22206.17	2691.84	7743.6	2344.51	24254.98	13976.13	6625.12	2474.38	82316.74	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 20:00:00.000000	21831.13	2610.28	7881.34	2322.59	23423.31	13623.26	6522.67	2344.73	80559.3	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 20:00:00.000000	21831.13	2610.28	7881.34	2322.59	23423.31	13623.26	6522.67	2344.73	80559.3	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 19:00:00.000000	21125.6	2451.57	7889.63	2240.15	22230.34	13218.24	6323.96	2318.17	77797.68	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 19:00:00.000000	21125.6	2451.57	7889.63	2240.15	22230.34	13218.24	6323.96	2318.17	77797.68	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 18:00:00.000000	20179.31	2234.73	7723.12	2072.65	21024.96	12676.8	6069	2381.38	74361.96	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 18:00:00.000000	20179.31	2234.73	7723.12	2072.65	21024.96	12676.8	6069	2381.38	74361.96	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 17:00:00.000000	19048.16	2092.48	7584.41	1996.14	19709.91	12011.08	5725.22	2308.66	70476.05	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 17:00:00.000000	19048.16	2092.48	7584.41	1996.14	19709.91	12011.08	5725.22	2308.66	70476.05	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 16:00:00.000000	17878.45	1971.52	7542.95	1967	18462.2	11189.84	5476.58	2202.02	66690.54	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 16:00:00.000000	17878.45	1971.52	7542.95	1967	18462.2	11189.84	5476.58	2202.02	66690.54	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 15:00:00.000000	16822.3	1879.73	7482.18	1866.69	17462.83	10456.21	5151.81	2062.49	63184.24	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 15:00:00.000000	16822.3	1879.73	7482.18	1866.69	17462.83	10456.21	5151.81	2062.49	63184.24	false	∅	∅	2026-09-25 01:22:28.469862
2026-09-24 14:00:00.000000	15896.09	1891.72	7361.58	1779.94	16707.88	9750.77	4861.06	1993.44	60242.46	false	∅	∅	2026-09-25 02:22:27.972313
2026-09-24 14:00:00.000000	15896.09	1891.72	7361.58	1779.94	16707.88	9750.77	4861.06	1993.44	60242.46	false	∅	∅	2026-09-25 01:22:28.469862

Coverage

100.0% complete0 gap days5,016 days with data

Show coverage history

Coverage: 100.0%Days with data: 5,016Gaps: 0

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Related load data

Related load data
Dataset	Description
Current Supply, Demand & Intraday ForecastERCOT · 5-minute	ERCOT's public real-time supply and demand dashboard at five-minute resolution. This is the preferred dataset for a current actual-versus-forecast demand comparison: series='realized' reports observed demand_mw and committed capacity_mw; series='intraday_forecast' reports demand_mw, capacity_mw, and available_mw for the same target event_time at successive source_time vintages; and series='forward_forecast' reports forecasted_demand_mw and avail_cap_gen_mw farther ahead. Operators, traders, and researchers use it to measure current forecast error, headroom, and how forecasts converge toward realized demand.
ERCOT Hourly Actual LoadERCOT · hourly	Actual hourly electricity demand in ERCOT, one row per hour with a system total and one column per weather zone. 119,475 hours, 2013-01 to now. Columns: system_mw plus coast_mw, east_mw, far_west_mw, north_mw, north_central_mw, south_central_mw, southern_mw, west_mw. system_mw is ERCOT's own published total, and the eight zones sum to it to within 0.03 MW — so a zone share is simply zone_mw / system_mw. Wide rather than long, so "load right now" and "the 8 weather zone shares of it" are one row, not 9. Every market's load table in this catalog shares the system_mw column and the same hourly grain, so a cross-market demand comparison needs no reshaping.
Load Forecast (MTLF)ERCOT · hourly (7-day forecast)	ERCOT's mid-term load forecast (MTLF) for the Texas grid, giving the expected electricity demand for each of the next seven days at hourly resolution. The forecast is broken out by ERCOT's eight weather zones plus a system-wide total, and a new vintage is issued every hour, so you can also see how the outlook for a given day shifts as it approaches. Operators use this to plan generation and reserves, while traders and researchers use it to anticipate price and tightness conditions and to study how forecasts evolve and where they miss. The official source is ERCOT report NP3-565-CD, Seven-Day Load Forecast by Weather Zone.
SCED Load Resource Data (60-Day)ERCOT · 5-minute (SCED), 60-day disclosure	Per-resource, per-interval telemetry for ERCOT's controllable Load Resources — large loads that curtail or provide ancillary services — from the 60-Day SCED Disclosure Reports. Each row is one SCED run (roughly every five minutes) for one load resource and its QSE, showing its real power consumption alongside its maximum and low consumption, its high and low dispatch limits (HDL, LDL), its SCED dispatch target (base point) and telemetered status, and its ancillary services. What ERCOT discloses about ancillary services changed with Real-Time Co-optimization plus Batteries (RTC+B) on 5 December 2025. Before it, each row carries the load's ancillary limits (HASL, LASL) and how much of each service it was responsible for (Reg-Up, Reg-Down, RRS, RRS-FFR, Non-Spin, ECRS). From it, those columns are empty and each row instead carries the load's ramp rates, its per-service ancillary capability, the ancillary services SCED awarded it in that interval (RRS by under-frequency relay, ECRS, Non-Spin and, rarely, RRS-PFR), and how much RRS and ECRS its QSE self-provided on it. Because Load Resources are how demand-side capacity participates in ERCOT's real-time market and reserves, this dataset shows demand response actually happening at five-minute resolution — how much load was armed for responsive reserve, when it was deployed, and how it followed dispatch. Like the gen file it is published on a 60-day regulatory delay, making it a historical record for studying demand-side flexibility, reserve provision, and load participation in scarcity events. The official source is ERCOT report NP3-965-ER, 60-Day SCED Disclosure Reports.