EIA-923 detailed data with previous form data (EIA-906/920)

Monthly (M) release date: January 24, 2025 for November 2024 data <br>

Next monthly release: End of February 2025 (December 2024 data)

Annual release date: October 4, 2024 for 2023 final data<br>

Next annual release: October 2025 for 2024 final data

2023 data re-released: January 23, 2025 Corrections/Revisions<br><br>All data prior to 2023 are final.*technotes: Updated 4/21/10 include information on changes to the data and other notes.<br>*****<br>The survey Form EIA-923 collects detailed electric power data --
monthly and annually -- on electricity generation, fuel consumption,
fossil fuel stocks, and receipts at the power plant and prime mover
level. Specific survey information provided:
Schedule 2 - fuel receipts and costsSchedules 3A &amp; 5A - generator data including generation, fuel consumption and stocksSchedule 4 - fossil fuel stocksSchedules 6 &amp; 7 - non-utility source and disposition of electricitySchedules 8A-F - environmental data

Monthly data (M) -approximately 3,034 plants from the monthly survey<br>
Annual final data - approximately 3,034 monthly plants + 9,528 plants from the annual survey
The EIA-906, EIA-920, EIA-923 and predecessor
forms provide monthly and annual data on generation and fuel consumption
at the power plant and prime mover level. A subset of plants,
steam-electric plants 10 MW and above, also provides boiler level and
generator level data. Data for utility plants are available from 1970,
and for nonutility plants from 1999. Beginning with January 2004 data
collection, the EIA-920 was used to collect data from the combined heat
and power plant (cogeneration) segment of the nonutility sector; also as
of 2004, nonutilities filed the annual data for nonutility source and
disposition of electricity. Beginning in 2007, environmental data was
collected on Schedules 8A – 8F of the Form 923 and includes by-product
disposition, financial information, NOX control operations, cooling
system operations and FGP and FGD unit operations. Beginning in 2008,
the EIA-923 superseded the EIA-906, EIA-920, FERC 423, and the EIA-423.
Schedule 2 of the EIA-923 collects the plant level fuel receipts and
cost data previously collected on the FERC and EIA Forms 423. Fuel receipts and costs data prior to 2008.
Power plant data prior to 2001 are separate files for utility and
nonutility plants. For 2001 data and subsequent years, the data are
Excel spreadsheet files that include data for all plants and make other
changes to the presentation of the data.
The Form EIA 906/920 data for 2004-2006 were updated. A new
method of allocating fuel consumption between electric power generation
and useful thermal output (UTO) was implemented for 2004-2008. This new
methodology proportionally distributes a combined heat and power (CHP)
plant’s losses between the two output products (electric power and UTO).
In the historical data, UTO was consistently assumed to be 80 percent
efficient and all other losses at the plant were allocated to electric
power. This change results in the fuel for electric power to be lower,
while the fuel for UTO is higher than the prior set of data as both are
given the same efficiency. This results in the appearance of an increase
in efficiency of production of electric power between 2003 and 2004.
The same methodology is applied to final 2007 and preliminary 2008 data.
More information about the methodology can be found in the Appendix C, Technical Notes, to the Electric Power Monthly

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