Fuel Mix Report

ERCOT's Fuel Mix Report (IntGenByFuel) gives actual electricity generation across the Texas grid broken out by fuel type, for every 15-minute settlement interval.

Generation data

Download data

Native record

event_time x fuel_type x settlement_type

15-minute (settlement) publication cadence

Evidence

Observed market data

Published observations from the named source

Time basis

Point-in-time records

UTC · event_time

Overview

Each interval lists output for categories such as gas, coal, nuclear, wind, solar, hydro, and storage, with values first published as initial readings and later restated as settlement-quality finals. It shows what physically ran on the system and in what proportion, letting operators, traders, and researchers track the real-time generation mix, gauge renewable penetration against load, and study how the fuel stack shifts hour to hour and season to season. The SQL agent queries this through the unified `ercot_fuel_mix` view (quality='settled') rather than this table directly.

Query contract

Preserve one canonical row per (event_time, fuel_type, settlement_type) before aggregating.

Analysis rules

Group only after preserving the declared grain: event_time, fuel_type, settlement_type.

Schema5

Column

Type

event_timeDateTime64(6, 'UTC')

fuel_typeLowCardinality(String)

settlement_typeLowCardinality(String)

gen_mwNullable(Float64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	fuel_type	settlement_type	gen_mw	ingested_at
2026-08-01 05:00:00.000000	wsl	INITIAL	-339.96508	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	wind	INITIAL	14175.326556	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	solar	INITIAL	0.047268	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	other	INITIAL	1065.790564	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	nuclear	INITIAL	4942.802432	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	hydro	INITIAL	1.785784	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	gas_cc	INITIAL	27522.180716	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	gas	INITIAL	12551.750356	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	coal	INITIAL	9748.265432	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	biomass	INITIAL	63.519328	2026-09-07 09:00:21.175031
2026-08-01 05:00:00.000000	wsl	INITIAL	-339.96508	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	wind	INITIAL	14175.326556	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	solar	INITIAL	0.047268	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	other	INITIAL	1065.790564	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	nuclear	INITIAL	4942.802432	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	hydro	INITIAL	1.785784	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	gas_cc	INITIAL	27522.180716	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	gas	INITIAL	12551.750356	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	coal	INITIAL	9748.265432	2026-08-31 09:00:28.572965
2026-08-01 05:00:00.000000	biomass	INITIAL	63.519328	2026-08-31 09:00:28.572965
2026-08-01 04:45:00.000000	wsl	INITIAL	-415.637288	2026-09-07 09:00:21.175031
2026-08-01 04:45:00.000000	wind	INITIAL	14113.864804	2026-09-07 09:00:21.175031
2026-08-01 04:45:00.000000	solar	INITIAL	0	2026-09-07 09:00:21.175031
2026-08-01 04:45:00.000000	other	INITIAL	1014.885184	2026-09-07 09:00:21.175031
2026-08-01 04:45:00.000000	nuclear	INITIAL	4941.688892	2026-09-07 09:00:21.175031

Coverage

100.0% complete0 gap days7,153 days with data

Show coverage history

Coverage: 100.0%Days with data: 7,153Gaps: 0

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Related generation data

Related generation data
Dataset	Description
ERCOT Generation Mix by FuelERCOT · 5-minute (live) and 15-minute (settled)	What is physically generating in ERCOT, in megawatts by fuel, one row per interval. 691,109 intervals, 2007-01 to now. Columns: coal_mw, gas_mw, nuclear_mw, hydro_mw, wind_mw, solar_mw, storage_mw, other_mw. Wide rather than long: a whole interval's mix is one row, so shares are computed across columns in that row and the timestamp does not repeat once per fuel. "Which fuel is largest" is greatest() across the columns, or simply reading the row.
Fuel Mix (5-minute)ERCOT · 5-minute	Realized generation in megawatts across ERCOT's eight headline fuel categories (such as gas, wind, solar, nuclear, coal, and hydro), reported at five-minute intervals for the Texas grid. This is the live operational view of where power is actually coming from at any moment, the faster companion to the settlement-grade Fuel Mix Report. It lets operators, traders, and researchers watch the resource mix shift in near real time, track renewable ramps and gas response intraday, and see how generation composition moves with load and prices. The official upstream source is ERCOT report NP6-788-CD (Fuel Mix Report). The SQL agent queries this through the unified `ercot_fuel_mix` view (quality='live') rather than this table directly.
Fuel Mix (Unified)ERCOT · 5-minute (live only, pending settled backfill)	Realized ERCOT generation in megawatts by fuel type (coal, hydro, nuclear, storage, solar, wind, gas, other), one row per (event_time, fuel_type, quality). Long-format unification of the live 5-minute feed and the settlement-grade Fuel Mix Report — but quality='settled' is TEMPORARILY DISABLED: ercot.fuel_mix_report's gen_mw was found to be ~4x too low (ERCOT publishes MWh delivered per 15-min interval, not average MW, and the writer didn't convert). The write-path bug is fixed, but existing report rows are still wrong pending a full historical backfill, so this view currently emits quality='live' only (the 5-minute feed, which reads a separate MW-native source and is correct). The settled branch will return once the backfill is verified. Always filter by event_time; this is a view, and an unbounded scan is expensive. This is the table the SQL agent actually queries; ercot_fuel_mix_report and ercot_fuel_mix_5min remain in the public catalog as the underlying raw sources.
Hourly RUC Committed CapacityERCOT · hourly	How much generation capacity ERCOT's Reliability Unit Commitment (RUC) process has effectively forced online, hour by hour. For each hour of the RUC study period, ERCOT publishes the sum of the High Sustained Limits (HSLs) of resources that are online in the most recent SCED execution but were indicated as offline in their Current Operating Plan (COP) — i.e. capacity RUC committed beyond what the market self-committed. This is a direct hourly proxy for RUC-committed MW, the signal behind reliability commitments on tight days. From 2021 the megawatts are broken out by weather zone (South, North, West, Houston) with committed_capacity_mw as the system total; earlier vintages (back to October 2018) carry the system-wide total only, since ERCOT did not publish the zonal split before then. It is bitemporal — every row carries both the study delivery hour (event_time) and the publishing vintage (source_time), so successive hourly RUC runs accumulate as distinct rows. The official source is ERCOT report NP3-764-CD, Hourly RUC Online In SCED Offline In COP.