Known Issues and Data Notes
eGRID2022
Updated April 2, 2024
Known Issues
Plant 59036
April 2, 2024
The plant name is listed as Biomass to Energy Facility, Kauai, but should be Onslow Energy. The state abbreviation, HI, should be NC. There are no data implications because plant 59036 does not have any emissions associated with it for data year 2022.
Metric Files
April 2, 2024
Beginning with eGRID2018, there is an error in the Unit file where the data does not properly align with the correct column header, starting at the "Unit unadjusted annual Hg emissions source" column. For example, the values that are supposed to be under "Unit SO2 (scrubber) first control device" are currently under "Unit unadjusted annual Hg emissions source", and so forth. Data for the "Unit unadjusted annual Hg emissions source" are missing from the metric file. This impacts the following column headers and column values: Unit SO2 (scrubber) first control device, Unit NOx first control device, Unit Hg Activated carbon injection system flag, and Unit year on-line.
Out of Service (OS) Generators with Generation
April 2, 2024
On the GEN22 sheet, some generators with an operating status of out of service (OS) erroneously have generation distributed to them. While it is possible for out of service generators to have generation before going out of service, some out of service generators did not have any actual generation but a portion of the facility's generation was erroneously distributed to them. This issue does not affect plant-level or subsequent aggregation level emission rates.
Data Notes
Mississippi CO2 oil output emission rate (lb/MWh)
April 2, 2024
The oil output rate (lb/MWh) for Mississippi is abnormally high due to the only one plant in Mississippi (plant 7719) that uses oil as its primary fuel having a very small net generation for 2022. The CO2 Total Output Emission Rate for plant 7719 is 108,205 lb/MWh due to this plant having 2 MWh of generation and 109 tons CO2e emissions. This can happen with some units that operate in a standby capacity where they produce relatively little generation but produce emissions. As a result, the Mississippi CO2 oil output emission rate (lb/MWh) is an outlier when compared to other states.
MRO NERC Region CO2 oil output emission rate (lb/MWh)
April 2, 2024
The CO2 oil output emission rate for the MRO NERC region is extremely high because two facilities have significant negative net generation that reduces the denominator for calculating the NERC region output emission rate. This causes the overall rate in this NERC region to be high. Negative net generation can occur when a power plant uses more electricity than it produces on an annual basis.
eGRID2018
See data notes here.