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Comparison of two U.S. power-plant carbon dioxide emissions data sets

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dc.contributor.author Ackerman, Katherine V.
dc.contributor.author Sundquist, Eric T.
dc.date.accessioned 2008-08-20T14:51:14Z
dc.date.available 2008-08-20T14:51:14Z
dc.date.issued 2008-06-25
dc.identifier.citation Environmental Science & Technology 42 (2008): 5688-5693 en
dc.identifier.uri http://hdl.handle.net/1912/2338
dc.description This paper is not subject to U.S. copyright. The definitive version was published in Environmental Science & Technology 42 (2008): 5688-5693, doi:10.1021/es800221q. en
dc.description.abstract Estimates of fossil-fuel CO2 emissions are needed to address a variety of climate-change mitigation concerns over a broad range of spatial and temporal scales. We compared two data sets that report power-plant CO2 emissions in the conterminous U.S. for 2004, the most recent year reported in both data sets. The data sets were obtained from the Department of Energy’s Energy Information Administration (EIA) and the Environmental Protection Agency’s eGRID database. Conterminous U.S. total emissions computed from the data sets differed by 3.5% for total plant emissions (electricity plus useful thermal output) and 2.3% for electricity generation only. These differences are well within previous estimates of uncertainty in annual U.S. fossil-fuel emissions. However, the corresponding average absolute differences between estimates of emissions from individual power plants were much larger, 16.9% and 25.3%, respectively. By statistical analysis, we identified several potential sources of differences between EIA and eGRID estimates for individual plants. Estimates that are based partly or entirely on monitoring of stack gases (reported by eGRID only) differed significantly from estimates based on fuel consumption (as reported by EIA). Differences in accounting methods appear to explain differences in estimates for emissions from electricity generation from combined heat and power plants, and for total and electricity generation emissions from plants that burn nonconventional fuels (e.g., biomass). Our analysis suggests the need for care in utilizing emissions data from individual power plants, and the need for transparency in documenting the accounting and monitoring methods used to estimate emissions. en
dc.description.sponsorship This study was supported by the National Research Program and the Earth System Dynamics Program of the U.S. Geological Survey. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Americal Chemical Society en
dc.relation.uri http://dx.doi.org/10.1021/es800221q
dc.title Comparison of two U.S. power-plant carbon dioxide emissions data sets en
dc.type Article en
dc.identifier.doi 10.1021/es800221q


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