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Changes to the results for the supercritical coal combustion technology reflect the use of a different and corrected thermal efficiency for harmonization. The original article and supporting information used a higher thermal efficiency for this technology than is appropriate. The harmonized results for this technology have increased as a result of the correction. However, the overall

Tabular summary of changes

RevisionPage number 
number(published)Revision
1S53In Summary, change “–53% in IQR magnitude” to “–56% in IQR magnitude”.
2S60Column 2, change “738 g CO2/kWh for supercritical coal combustion” to “830 g CO2/kWh for supercritical coal combustion”.
3S62–S63Revised values for Combustion CO2 emission factor and Cumulative—all parameters harmonization for All Technologies and Supercritical. See below for new table 2 sections for those technologies.
4S64Revised image for figure 2—only changes to panels (F) and (H); see below for new image.
5S66Column 1, change “738 g CO2/kWh for supercritical coal combustion” to “830 g CO2/kWh for supercritical coal combustion”.
6S66Column 1, change “with reductions of 61%, 46%, and 52% in IQR magnitude” to “with reductions of 61%, 46%, and 46% in IQR magnitude”.
7S66Column 2, change “resulted in significant IQR reductions of 60%, 41%, and 42%” to “resulted in significant IQR reductions of 60%, 41%, and 35%”.
8S66Column 2, change “and the IQR magnitude decreased by 53% with bounding values of 930 to 1,050 g CO2-eq/kWh” to “and the IQR magnitude decreased by 56% with bounding values of 940 to 1,050 g CO2-eq/kWh”.
9S67New image for figure 3; see below.
10S69Column 2, change “reduced the IQR magnitudes for subcritical, IGCC, and supercritical coal combustion by approximately 40% to 60%” to “reduced the IQR magnitudes for subcritical, IGCC, and supercritical coal combustion by approximately 35% to 60%”.
11S69Column 2, change “the IQR magnitude decreased by 57% to bounding values of 930 to 1,050 g CO2-eq/kWh” to “the IQR magnitude decreased by 56% to bounding values of 940 to 1,050 g CO2-eq/kWh”.

conclusions have not changed. Below is a tabular summary of where in the article results have changed. Also, revised versions of three display items are provided. Please note that table 1 of the published article remains unchanged because it reports the unharmonized thermal efficiency for each study/technology.

Revised table 2 The only changes were to All Technologies and Supercritical Values so these are the only sections shown. The table gives changes to measures of central tendency and variability from the application of individual harmonization steps and from the cumulative application of all harmonization parameters (all values reported in grams of carbon dioxide equivalent per kilowatt-hour [g CO2-eq/kWh])

   Harmonization steps
    T&DCoal mineThermalCombustion CO2System: allCumulative:
TechnologyMetricPublishedGWPlossmethaneefficiencyemission factorparametersall parameters
All technologiesMean1,0261,0301,0201,0301,0401,0001,0201,000
 Std. dev.199200200200150100200100
 Minimum675670660670710830660820
 25th percentile891890870890950940870940
 Median1,0011,0009901,0101,0409801,010980
 75th percentile1,1341,1301,1101,1301,1201,0501,1201,050
 Maximum1,6891,6901,6901,6901,6901,3701,6901,370
 IQR magnitude2432402402440170100250110
 Range1,0141,0101,0301,0109805401,030550
 Change in mean<−5%<−5%<5%<5%<−5%<−5%<−5%
 Change in median<5%<−5%<5%<5%<−5%<5%<−5%
 Change in std. dev.<−5%<−5%<−5%−23%−49%<−5%−49%
 Change in IQR<5%<−5%<−5%−31%−57%<5%−56%
 Change in range<5%<5%<5%<−5%−47%<5%−46%
 Count of estimates16471164164133164164164
 Count of references5319535338535353
SupercriticalMean858860850860920900850890
 Std. dev.101100100100807010070
 Minimum687690680690750830680820
 25th percentile781780750800880860780840
 Median863860840860920870840870
 75th percentile922940910920990930910930
 Maximum1,0591,0601,0601,0601,0601,1301,0601,130
 IQR1411601601301108013090
 Range372370380370310300380310
 Change in mean<5%< −5%<5%7.1%<5%<−5%<5%
 Change in median<5%< −5%<5%6.8%<5%<−5%<5%
 Change in std. dev.<5%< −5%<−5%−19%−35%<−5%−29%
 Change in IQR13%12%−10%−22%−46%<5%−35%
 Change in range<5%<5%<5%−16%−19%2%−16%
 Estimates234232323232323
 References132131311131313
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Revised image for figure 2 There are only changes to panels (F) and (H). The figure shows rank-order estimates (n = 164, displayed least to greatest) of life cycle grams of carbon dioxide equivalent per kilowatt-hour (g CO2-eq/kWh) for coal-fired electricity generation, drawn from literature that passed screenings for quality and relevance. Panel (A) reports only published data values. Panels (B) through (F) show the impact of independent application of harmonization steps (open circles) relative to published data (filled circles): (B) system harmonization by global warming potential (GWP); (C) system harmonization by transmission and distribution (T&D) loss; (D) system harmonization by coal mining methane; (E) technical harmonization by thermal efficiency; and (F) technical harmonization by combustion emission factor (CEF). Panel (G) shows the effect of applying all three system harmonization steps, and panel (H) shows the cumulative effect of applying technical harmonization after system harmonization. For all of the evaluated technologies, the thermal efficiency, CEF, and cumulative harmonization steps use technology-specific harmonization factors.Numerical data associated with each point are displayed in table S2 of the supporting information on the Web. The y-axis reads 600 to 1,800 g CO2-eq/kWh.

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Revised image for figure 3 Box plots of published and harmonized estimates of life cycle greenhouse gas (GHG) emissions for coal-fired electricity generation considering all four evaluated technologies as a group and each evaluated technology independently using technology-specific harmonization factors for all analyses.

Supporting Information

  1. Top of page
  2. Supporting Information
FilenameFormatSizeDescription
jiec12060-sup-0001-S1.pdf558KSupporting Information S1. This supporting information provides a revised version of the supporting information that appeared with the originally published article. It contains additional details of methods for coal harmonization, disaggregation of estimates of GHG emissions by life cycle stage, results of harmonization applied collectively across all coal technologies and the full list of references reviewed for this harmonization. The revisions reflect corrections from the original article regarding results for the supercritical technology. Overall conclusions have not changed.

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.