MEMORANDUM 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

WASHINGTON, D.C. 20460 

SEP 0 2 2015 OFFICE OF 

AIR AND RADIATION 

SUBJECT: Correction of Inadvertent Errors in the Final Rule, .. Standards of Performance for 

Greenhouse Gas Emissions from New, Modifi ed, and Reconstructed Stationary 

Sources: Electric Utility Generating Units,'· and Associated Supporting 

Documents 

FROM: Janet G. McCabe ~ ~ o .("lc..L.t _ Acting Assistant Administrator (6 10 l A) 

THRU: Lori e Schmidt, Associate General Counsel ~/Ah/I/}~ Air and Radiation Law Office (2344A) 

TO: 

Joel Beauvais, Associate Administrator /f) ~ vW-/ 

Office of Policy ( 1804A) J 0 -

Gina McCarthy 

Administrator ( 110 l A) 

Several inadvertent errors were made in the process of preparing the signature package for the 

Clean Air Act section 111 (b) final rule, '·Standards of Performance for Greenhouse Gas 

Emissions from New, Modified, and Reconstructed Stationary Sources: Electric Utility 

Generating Units," signed on August 3, 2015. Corrections have been made to ensure the 

accuracy and consistency of the preamble and the regulatory text. Corrections to the signed final 

rule that merit explanation are listed below. The corrections listed below include page numbers 

which refer to the red line and strikeout version of the signed rule. which is provided as 

Attachment 1. All of the corrections are shown in the red line and strikeout version of the signed 

rule. The corrections shown include those listed below, as well as grammatical, punctuation and 

formatting corrections, including those needed to conform with requirements for publication in 

the Federal Register. 

Inadvertent errors were also made in the process of preparing final supporting documents. These 

documents include the regulatory impact analysis (RIA) and the GHG Mitigation Measures 

technical support document (TSO). Corrections to these suppor1ing documents that merit 

explanation are listed below. Attachment 2 is a red line and strikeout version of the RIA that 

shows all corrections. Attachment 3 is a com pi lat ion of the corrections to the G HG Mitigation 

Measures TSO. excerpted from the full document and shown in redline and strikeout. 

ln1ernet Address (URL) • http://wwwepa.gov 

Recycled/Recyclable • Prinled with Vege1able 011 Based Inks on 100•. Pos1consumer. Process Chlorine Free Recycled Paper 
2 

Preamble 

• Page 242 - Deleted " full" and " lGCC" and replaced "Gas" with "Gasification" to read as 

follows: "All components are likewise demonstrated for pre-combustion CCS at the Dakota 

Gasification facility ... " These edits are necessary because the Dakota Gasification facility is 

not an IGCC and captures approximately 50 percent of the facility's C02. and, therefore, 

should not be described as "full CCS." 

• Page 452 - Added "of more than 10 percent" to read as follows: "The EPA further notes that 

the types of large, more capital intensive projects that may trigger the " larger modifications" 

threshold (i.e., result in an hourly increase in C02 emissions of more than 10 percent) .... " 

This edit is necessary for accuracy in describing the " larger modifications" threshold. 

• Page 462 - Replaced "distillate" with "fuel" and added "No." to read as follows: "For multifuel-fired stationary combustion turbines, the BSER is also the use of clean fuels (e.g., 

natural gas, ethylene, propane, naphtha, jet fuel kerosene, fuel oils No. 1 and 2, biodiesel, and 

landfill gas). " This edit is necessary for clarification and to use the correct terminology. 

Conforming edit have also been made on pages 564 and 567. 

• Page 486 - Deleted "annual " to read as follows: "The proposed 219,000 MWh total sales 

criterion was based on ... " This edit is necessary because the proposed criterion was not 

based on annual sales for combustion turbines. 

• Page 513 - Corrected the expected lower range of percent sales in the sliding scale from "35" 

to "33" to read as follows: "Based on the sliding-scale approach, owners and operators of 

new simple cycle combustion turbines will be able to sell between 33 to 44 percent of the 

turbine's potential electric output." This edit is necessary for accuracy. 

• Page 533 - Replaced "the cost-effectiveness of CCS for these units would be much higher 

than for base load units" with "CCS would be less cost-effective for these units than for base 

load units" to read as follows: "In addition, because the CCS system would remain idle for 

much of the time while these units are not running, CCS would be less cost-effective for 

these units than for base load units." This edit more clearly makes the point regarding costeffectiveness of CCS. 

• Page 537 - Added "quality" to read as follows: "Finally, the use of clean fuels will not have 

any significant energy or non-air quality impacts." This edit is necessary for accuracy in 

describing impacts. 

• Page 548 - Corrected the number of units from "346" to ''345" to read as follows: "In our 

analysis, we evaluated 345 NGCC units with online dates ranging from 2000 to 2013." This 

edit is necessary for accuracy. 

• Page 617 - Deleted " in this rule and" to read as follows: " In addition, this NSPS will apply to 

some modified and reconstructed units, as those terms are defined under part 60." This 

correction clarifies that the tenns are not defined in this rule. 

• Pages 693-697 - Added a description of each voluntary consensus standard that is cited in 

the final rule (e.g., ANSI, ASTM, ASME and ISO methods) as required by the OFR. 

• Footnotes - In addition to making minor typographical corrections and clarifications, 

document ID numbers were added to footnotes referencing public comments for convenience 

of the reader. 
3 

Regulatory text 

The following corrections have been made to ensure clarity and consistency with the preamble. 

• Page 712 (60.5509(a)(2)) - Add ··or generators"' to read as follows: 

''(2) Serves a generator or generators capable of selling greater than 25 MW of electricity to a 

utility power distribution system." 

• Page 716 (60.5520(d) introductory paragraph) - Replaced "of the" with "uniform" and 

"listed'" with "as described" in the first sentence to read as follows: 

'·(d) Stationary combustion turbines subject to a heat input-based standard in Table 2 that are 

only permitted to burn one or more unifonn fuels, as described in paragraph ( d)(l) of this 

section .... " 

• Page 716 (60.5520(d)( I)) - Added " less" in the first sentence, and replaced "distillate oil No. 

1" with "No. 1 fuel oil'" and added "fuel oil" in the second sentence to read as follows: 

'"(1) Stationary combustion turbines that are only permitted to bum fuels with a consistent 

chemical composition (i.e., uniform fuels) that result in a consistent emission rate of 160 lb 

C02/MMBtu or less_are not subject to any monitoring or reporting requirements under this 

subpart. These fuels include ... No. 1 fue l oil, No. 2 fuel oil, and .... " 

• Page 7 16 (60.5520(d)(2)) - Added "not" to read as follows: 

"(2) Stationary combustion turbines pern1itted to bum fuels that do not have a consistent 

chemical composition or that do not have an emission rate .... ·· 

• Pages 749, 755 and 758 (60.5580) - Deleted the definitions of Coal refuse. Oil, and System 

emergency. The first two terms are not used in this final rule and are unnecessary and System 

emergency is listed twice. 

• Page 752 (60.5580) - Replaced "unit'' with "facility'· and "stationary combustion turbine" 

with ·'facility," and added·'_ plus any integrated equipment that provides electricity or useful 

thermal output to the affected EGU or auxiliary equipment" to the definition of Integrated 

gasification combined cycle unit or IGCC to read as follows: 

"Integrated gasification combined cycle facility or !CCC means a combined cycle facility 

that is designed to burn fuels containing 50 percent (by heat input) or more solid-derived fuel 

not meeting the definition of natural gas, plus any integrated equipment that provides 

electricity or useful thermal output to the affected EGU or auxiliary equipment. ... " 

• Page 754 (60.5580) - Replaced .. (i)'" with"'( Ir and .. (iir with "(2), .. and deleted "Except as 

provided under paragraph (ii) of this definition," in redesignated paragraph ( 1) in the 

definition of Net energy output to read as fo llows: 

"Net energy output means: 

(I) The net electric or mechanical output from the affected EGU plus I 00 percent of the 

useful thermal output; or 

(2) For combined heat and power facilities .... " 

• Page 755 (60.5580) - Replaced "3 10,000" with "306,000'" in the definition of Potential 

electric output to be consistent with the rounding convention adopted in this final rule (i.e., 

numbers or l ,000 or greater have 3 signifi cant digits). The revised definition reads as 

follows: 

"Potential electric output means ... (e.g .. a 35 percent efficient affected EGU with a 100 

MW (34 1 MMBtu/h) fossil fuel heat input capacity would have a 306.000 MWh 12-month 

potential e lectric output capacity).,. 
4 

• Page 761 (Table 2) - Added "or 50 percent, whichever is less" to the first and second rows in 

the first column (i.e., column labeled "Affected EGU"), added "both a 12-operating month 

and" to the first row in the first column, and added "either a 12-operating month or" to the 

second row in the first column to read as follows: 

Affected EGU 

"Newly constructed or reconstructed stationary combustion turbine that supplies more than 

its design efficiency or 50 percent, whichever is less, times its potential electric output as netelectric sales on both a 12-operating month and a 3-year rolling average basis and combusts 

more than 90% natural gas on a heat input basis on a 12-operating-month rolling average 

basis." 

"Newly constructed or reconstructed stationary combustion turbine that supplies its design 

efficiency or 50 percent, whichever is less, times its potential electric output or less as netelectric sales on either a 12-operating month or a 3-year rolling average basis and combusts 

more than 90% natural gas on a heat input basis on a 12-operating-month rolling average 

basis." 

• Page 763 (Table 3) - Added "Yes (steam generating units and IGCC facilities)" and 

"(stationary combustion turbines)" to the third column (i.e., the column labeled "Applies to 

subpart TTTT") of the fourteenth row (i.e., the row labeled "60.14") and replaced "No" with 

"Yes" in the third column of the fifteenth row (i.e., the row labeled "60.15") to read as 

follows: 

General . . . Subject . .. 

§60.14 Modification 

§60.15 Reconstruction 

Regulatory Impact Analysis 

Applies to subpart TTTT . . . 

"Yes (steam generating units and IGCC facilities) 

No (stationary combustion turbines)" 

"'Yes" 

• Updated IPM web links: Revised website address for all references to lPM modeling data 

from: http://wwvv.epa.gov/powersectonnodeling/ to 

http://www.epa.gov/airmarkets/powersectormodeling.html.:. 

GHG Mitigation Measures TSO 

• Revised website address for all references to IPM modeling data to: 

http://www.epa.gov I ai nnarkets/powersectormodeling.html. 

• Revised language and footnote in Chapter 2 on heat rate improvement (HRI) as follows: 

o Sec 2.5.2.2 - Deleted "ambient air (primary air) is mixed with fuel prior to 

combustion and a fraction of' from "Ambient air temperature can affect gross heat 

rate in three ways: (1) ambient air (primary air) is mixed with fuel prior to 

combustion and a fraction of energy released during combustion heats the incoming 

air, ... ,"to read "Ambient air temperature can affect gross heat rate in three ways: ( 1) 

energy released during combustion heats the incoming air, .. .. " 

o Corrected final footnote by replacing "See supra 93" with "See supra 95." 
5 

We recommend correction of these inadvertent errors and approval of these changes by signing 

and dating below. 

&d, Zp; .,:' 

Dat d / 

Administrator. 

Attachments 

cc: Kristien Knapp/OA (I I 0 I A)