core_eia860__scd_boilers
Slowly changing dimension (SCD) table describing attributes of boilers which may vary from year to year. Compiled from across all EIA-860 data.
- Most-recent data:
2025
- Processing:
Data has been cleaned and organized into well-modeled tables that serve as building blocks for downstream wide tables and analyses.
- Source:
EIA Form 860 -- Annual Electric Generator Report
- Primary key:
plant_id_eia, boiler_id, report_date
Usage Warnings
Data has been drawn from several EIA sources which are not always consistent with each other, and PUDL chooses the most consistent or relevant value to facilitate cross-referencing even if that means some values will differ from the raw sources. See Harvesting for details, and see Entity Resolution Methodology for a fuller conceptual overview.
Contains information from multiple raw inputs.
Additional Details
This is one of two tables where canonical values for boilers are set. It contains values which are expected to vary slowly, while core_eia__entity_boilers contains those expected to remain fixed. EIA reports many attributes in many different tables across EIA-860 and EIA-923. In order to compile tidy, well-normalized database tables, PUDL collects all instances of these values and and chooses a canonical value. By default, PUDL chooses the most consistently reported value of a given attribute as long as it is at least 70% of the given instances reported. If an attribute was reported inconsistently across the original EIA tables, then it will show up as a null value. See /methodology/entity_resolution for a conceptual overview of this process. All tables downstream of this one inherit the canonical values established here.
Columns
The unique six-digit facility identification number, also called an ORISPL, assigned by the Energy Information Administration.
Alphanumeric boiler ID.
Date reported.
Date the boiler began or is planned to begin commercial operation.
EIA short code identifying boiler operational status.
Date of the scheduled or effected retirement of the boiler.
EIA short code indicating the standards under which the boiler is operating as described in the U.S. EPA regulation under 40 CFR.
EIA short code indicating the type of firing used by this boiler.
EIA short code indicating the type of firing used by this boiler.
EIA short code indicating the type of firing used by this boiler.
Design firing rate at maximum continuous steam flow for coal to the nearest 0.1 ton per hour.
Design firing rate at maximum continuous steam flow for pet coke to the nearest 0.1 barrels per hour.
Design firing rate at maximum continuous steam flow for gas to the nearest 0.1 cubic feet per hour.
Design firing rate at maximum continuous steam flow for energy sources other than coal, petroleum, or natural gas.
The code representing the most predominant type of energy that fuels the boiler.
The code representing the second most predominant type of energy that fuels the boiler.
The code representing the third most predominant type of energy that fuels the boiler.
The code representing the fourth most predominant type of energy that fuels the boiler.
Design waste-heat input rate at maximum continuous steam flow where a waste-heat boiler is a boiler that receives all or a substantial portion of its energy input from the noncumbustible exhaust gases of a separate fuel-burning process (MMBTU per hour).
Wet or Dry Bottom where Wet Bottom is defined as slag tanks that are installed at furnace throat to contain and remove molten ash from the furnace, and Dry Bottom is defined as having no slag tanks at furnace throat area, throat area is clear, and bottom ash drops through throat to bottom ash water hoppers.
Indicates whether the boiler is capable of re-injecting fly ash.
indicates if the boiler is a heat recovery steam generator (HRSG).
Maximum continuous steam flow at 100 percent load.
The turndown ratio for the boiler.
Boiler efficiency percentage when burning at 100 percent load to the nearest 0.1 percent.
Boiler efficiency percentage when burning at 50 percent load to the nearest 0.1 percent.
Total air flow including excess air at 100 percent load, reported at standard temperature and pressure (i.e. 68 F and one atmosphere pressure).
Indicates whether the boiler is subject to New Source Review requirements.
Month of issued New Source Review permit.
New Source Review permit number.
EIA short code for most stringent type of statute or regulation code under which the boiler is operating for particulate matter control standards.
EIA short code for most stringent type of statute or regulation code under which the boiler is operating for sulfur dioxide control standards.
EIA short code for most stringent type of statute or regulation code under which the boiler is operating for nitrogen oxide control standards.
Numeric value for the unit of measurement specified for particulate matter.
Numeric value for the unit of measurement specified for sulfur dioxide.
Numeric value for the unit of measurement specified for nitrogen oxide.
Numeric value for the unit of measurement specified for particulate matter.
Numeric value for the unit of measurement specified for sulfur dioxide.
Numeric value for the unit of measurement specified for nitrogen oxide.
Year boiler was or is expected to be in compliance with federal, state and/or local regulations for particulate matter emissions.
Year boiler was or is expected to be in compliance with federal, state and/or local regulations for nitrogen oxide emissions.
Year boiler was or is expected to be in compliance with federal, state and/or local regulations for sulfur dioxide emissions.
If boiler is not in compliance with particulate matter regulations, strategy for compliance.
If boiler is not in compliance with particulate matter regulations, strategy for compliance.
If boiler is not in compliance with particulate matter regulations, strategy for compliance.
If boiler is not in compliance with sulfur dioxide regulations, strategy for compliance.
If boiler is not in compliance with sulfur dioxide regulations, strategy for compliance.
If boiler is not in compliance with sulfur dioxide regulations, strategy for compliance.
Existing strategies to meet the sulfur dioxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Existing strategies to meet the sulfur dioxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Existing strategies to meet the sulfur dioxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Planned strategies to meet the sulfur dioxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Planned strategies to meet the sulfur dioxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Planned strategies to meet the sulfur dioxide requirements of Title IV of the Clean Air Act Amendment of 1990.
If boiler is not in compliance with nitrogen oxide regulations, strategy for compliance.
If boiler is not in compliance with nitrogen oxide regulations, strategy for compliance.
If boiler is not in compliance with nitrogen oxide regulations, strategy for compliance.
Existing strategies to meet the nitrogen oxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Existing strategies to meet the nitrogen oxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Existing strategies to meet the nitrogen oxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Planned strategies to meet the nitrogen oxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Planned strategies to meet the nitrogen oxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Planned strategies to meet the nitrogen oxide requirements of Title IV of the Clean Air Act Amendment of 1990.
Year boiler was or is expected to be in compliance with federal, state and/or local regulations for mercury emissions.
Existing strategy to comply with the most stringent mercury regulation.
Existing strategy to comply with the most stringent mercury regulation.
Existing strategy to comply with the most stringent mercury regulation.
Existing strategy to comply with the most stringent mercury regulation.
Existing strategy to comply with the most stringent mercury regulation.
Existing strategy to comply with the most stringent mercury regulation.
Proposed strategy to comply with the most stringent mercury regulation.
Proposed strategy to comply with the most stringent mercury regulation.
Proposed strategy to comply with the most stringent mercury regulation.
Existing strategy to comply with the most stringent nitrogen oxide regulation.
Existing strategy to comply with the most stringent nitrogen oxide regulation.
Existing strategy to comply with the most stringent nitrogen oxide regulation.
Name of nitrogen oxide control manufacturer.
Code indicating the nitrogen oxide control burner manufacturer.
Proposed strategy to comply with the most stringent nitrogen oxide regulation.
Proposed strategy to comply with the most stringent nitrogen oxide regulation.
Proposed strategy to comply with the most stringent nitrogen oxide regulation.
Nitrogen oxide control status code.
Most stringent type of statute or regulation code under which the boiler is operating for mercury control standards.
Existing strategy to comply with the most stringent sulfur dioxide regulation.
Existing strategy to comply with the most stringent sulfur dioxide regulation.
Existing strategy to comply with the most stringent sulfur dioxide regulation.
Proposed strategy to comply with the most stringent sulfur dioxide regulation.
Proposed strategy to comply with the most stringent sulfur dioxide regulation.
Proposed strategy to comply with the most stringent sulfur dioxide regulation.
The percent of sulfur dioxide to be scrubbed specified by the most stringent sulfur dioxide regulation.
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.