_core_eia923__yearly_emissions_control
Return to SearchAnnual time series of Actual rate and removal efficiency for air emissions reported by thermoelectric or combined-cycle power plants with a total steam turbine capacity greater than or equal to 10 megawatts.
- Most-recent data:
2024
- Processing:
Data has been cleaned but not tidied/normalized. Published only temporarily and may be removed without notice.
- Source:
EIA Form 923 -- Power Plant Operations Report (Schedule 8C)
- Primary key:
This table has no primary key. This table is not yet normalized, and contains information about several different types of emissions control equipment, each of which has its own ID, and not all of which are present at every plant. As a result there is currently no unique, non-null primary key. Conceptually, the primary key should consist of plant_id_eia, report_date, mercury_control_id_eia, nox_control_id_eia, so2_control_id_eia, and particulate_control_id_eia. In practice many records have NULL values for all of the control equipment IDs.
Usage Warnings
This table is experimental and/or a work in progress and may change in the future.
Additional Details
In the raw data, the so2_test_date and particulate_test_date columns contained a wide variety of non-standard date formats. They have been standardized to ISO-8601 (YYYY-MM-DD) where possible. Missing days and months have been filled in with 01. A handful of manual spot-fixes have been applied to particularly strange formats. Two-digit years have been assumed to fall between 1950 and the last year observed in the report_date column.
Columns
The unique six-digit facility identification number, also called an ORISPL, assigned by the Energy Information Administration.
Date reported.
Removal efficiency for acid gas emissions. Ranges from 0 to 1.
Actual controlled (or uncontrolled) nitrogen oxides emission rate. Based on data from CEMS where possible.
Maturity of the source data published by EIA that is reflected in this record. EIA releases data incrementally over time, including monthly updates, annual year-to-date updates, provisional early releases of annual data, and final annual release data that is not expected to change further. Records sourced from multiple upstream EIA datasets may have no well defined data maturity. Records whose values have been inferred within PUDL will also have no data maturity.
Type of equipment or strategy for the control of air emissions.
Electric power consumed by the flue gas desulfurization unit (in MWh).
Quantity of flue gas desulfurization sorbent used, to the nearest 100 ton.
Total hours the emissions control was in service during the reporting year, rounded to the nearest hour.
Mercury control identification number. This ID is not a unique identifier.
Actual controlled (or uncontrolled) mercury emission rate, based on data from CEMS, where possible.
Removal efficiency for mercury emissions. Ranges from 0 to 1.
Nitrogen oxide control identification number. This ID is not a unique identifier.
The operating status of the asset. For generators this is based on which tab the generator was listed in in EIA 860.
Actual controlled (or uncontrolled) nitrogen oxides emission rate during the ozone season (May to September)
Particulate matter control identification number. This ID is not a unique identifier.
Average annual emission removal rate for particulate matter.
The tested efficiency for the removal of particulate matter at 100 percent load. If not tested at 100 percent load, then the load at which the test was conducted is included as a comment on Schedule 9. If no test was conducted, the test date and tested efficiency field should be blank. Ranges from 0 to 1.
Particulate removal efficiency, based on the annual operating factor, which is defined as annual fuel consumption (MMBTU) divided by the product of the boiler design firing rate (MMBTU per hour) and hours of operation per year.When actual data are not available, estimates are provided based on equipment design performance specifications. Ranges from 0 to 1.
Date of the latest efficiency test for the removal of particulate matter.
Sulfur dioxide control identification number. This ID is not a unique identifier.
The tested efficiency for the removal of sulfur dioxide at 100 percent load. If not tested at 100 percent load, then the load at which the test was conducted is included as a comment on Schedule 9. If no test was conducted, the test date and tested efficiency field should be blank. Ranges from 0 to 1.
Sulfur dioxide removal efficiency, based on the annual operating factor, which is defined as annual fuel consumption (MMBTU) divided by the product of the boiler design firing rate (MMBTU per hour) and hours of operation per year.When actual data are not available, estimates are provided based on equipment design performance specifications. Ranges from 0 to 1.
Date of most recent test for sulfur dioxide removal efficiency.