Fuel Mix (Unified)

Realized ERCOT generation in megawatts by fuel type (coal, hydro, nuclear, storage, solar, wind, gas, other), one row per (event_time, fuel_type, quality).

Generation data

Download data

Native record

ERCOT system x fuel type x 5-minute (live) or 15-minute (settled) interval

5-minute (live only, pending settled backfill) publication cadence

Evidence

Observed market data

Published observations from the named source

Time basis

Point-in-time records

UTC · event_time

Overview

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.

Query contract

Select one exact event_time and one quality ('live' or 'settled'); never mix quality within one snapshot or sum across it. gen_mw is already the collapsed, revision-resolved value for that (event_time, fuel_type, quality) — no further argMax/vintage reduction is needed or correct.

Analysis rules

For a current fuel mix, use every fuel_type row at the same latest event_time and quality; do not combine values from different snapshots or different quality levels.
Calculate shares against the sum of gen_mw across fuel_type at that (event_time, quality).

Interpretation

quality='settled' is temporarily unavailable (returns no rows): the underlying ercot.fuel_mix_report source had a ~4x unit bug (MWh-per-interval stored as if it were average MW). Only quality='live' is currently exposed. Do not describe historical/settled fuel-mix data as unavailable in general — this is a known, temporary gap being backfilled, not a product boundary.
gen_mw for fuel_type='storage' is net fleet output: positive is discharging into the grid, negative is charging from the grid.

Schema4

Column

Type

event_timeDateTime64(6, 'UTC')

fuel_typeString

gen_mwNullable(Float64)

qualityString

Sample data

event_time	fuel_type	gen_mw	quality
2026-09-05 23:15:00.000000	coal	10712.4970703125	live
2026-09-05 23:15:00.000000	hydro	63.4370002746582	live
2026-09-05 23:15:00.000000	nuclear	4956.189453125	live
2026-09-05 23:15:00.000000	storage	2474.01000976562	live
2026-09-05 23:15:00.000000	solar	15855.0732421875	live
2026-09-05 23:15:00.000000	wind	8779.23046875	live
2026-09-05 23:15:00.000000	gas	39617.64739990235	live
2026-09-05 23:15:00.000000	other	76.0999984741211	live
2026-09-05 23:10:00.000000	coal	10759.8740234375	live
2026-09-05 23:10:00.000000	hydro	64.4290008544922	live
2026-09-05 23:10:00.000000	nuclear	4960.56982421875	live
2026-09-05 23:10:00.000000	storage	2251.4033203125	live
2026-09-05 23:10:00.000000	solar	16332.01171875	live
2026-09-05 23:10:00.000000	wind	8609.4130859375	live
2026-09-05 23:10:00.000000	gas	39570.85180664064	live
2026-09-05 23:10:00.000000	other	71.9000015258789	live
2026-09-05 23:05:00.000000	coal	10758.13671875	live
2026-09-05 23:05:00.000000	hydro	64.4380035400391	live
2026-09-05 23:05:00.000000	nuclear	4956.0859375	live
2026-09-05 23:05:00.000000	storage	1593.31359863281	live
2026-09-05 23:05:00.000000	solar	17004.146484375	live
2026-09-05 23:05:00.000000	wind	8632.8896484375	live
2026-09-05 23:05:00.000000	gas	39578.07701110839	live
2026-09-05 23:05:00.000000	other	69.8000030517578	live
2026-09-05 23:00:00.000000	coal	10760.5400390625	live

Coverage

100.0% complete0 gap days89 days with data

Show coverage history ▾

Coverage: 100.0%Days with data: 89Gaps: 0

2026

gaplessmore

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 ReportERCOT · 15-minute (settlement)	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. 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.
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.