### ME MORA ND UM UNITED STATES EN V IR O NMENTAL PROTECTION AGENCY WASH IN GTO N , D. C. 20460 

## SEP 0 2 2015 OFFICE OF AIR AND RAD I ATION 

### SUB J ECT : Correction of Inad vertent E rrors in the Final Rule, .. Standards of Pe rformance for Greenhou se Gas E missions from New, Modifi e d , and Recon s tructed Stationary Sour ces : Elec tr ic Utility Generat ing Units ,'· and Assoc iated Suppo rt ing Documents 

### F RO M: Janet G. McCabe

### ~**~** 

## o .("lc..L. t _ Acting Assistant Administrator (6 10 l A) 

### THRU: Lo ri e Schm idt , Associate General Coun sel

# ~/Ah/I/}~ Air and Radiation Law Office (2344A)



### TO : Joel Beauvais , Assoc iate Admini s trator 

## /f)**~** 

# vW-/ Office of P o li cy ( 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 , '·S tandard s of Per forma nc e for Greenhouse Gas Emissions from New, Mod ified , and Recon s tructed Stationary Sources: E lectric Ut ility Generat ing Un its ," signed on August 3, 2015. Corrections have been made to ensure the accuracy and consistency of th e preamble and the regulatory tex t. Corrections to the signed final rule that merit exp lanati on are listed belo w. The corrections li s ted be low include page number s w hich refer to the redline and s trikeout vers ion of the signed rul e. w hich is provided as Attachment 1. All of the corrections are s hown in the red line a nd strikeout vers io n of the s ig ned rule . The corrections shown include those li sted be low, as well as grammatical , punctuation and formatt in g corrections , inc luding those needed to conform wi th requirement s for publication in the 

### Federal Register. Inad verten t errors were a l s o made in the process of preparing final suppor tin g documents. The s e document s include the re g ulatory impact analysis ( R IA) and the GHG Miti ga ti on Measures technical s upport document (TSO). Corrections to these s uppor1ing document s that merit explanation are li s ted be low. Attachment 2 is a red line and s trikeout version o f the RIA that s how s all corrections. Attachment 3 i s a compi lation of the corrections to the G HG Mitigation Measure s TSO . excerpted from the full document and sh own in redline and s trikeout.

ln1erne t Address ( URL ) • http://wwwepa . gov Recycled/ R ecyclable • Prinled with Vege1able 011 Based Inks on 100• . Pos1con sumer. Process Chlorine Free Recycled Paper

### 2 Preamble • Page 

### 242 - Deleted " full " and " lGCC " and replaced "Gas" with "Gas ification " to read as follows: "All components are likewi se demonstrated for pre-combustion CCS at the Dakota Gasification facility ... " T hese edits are necessar y because th e Dakota Gasification facility is not an IGCC and captures approximately 50 percent of the facility ' s C0 2. and , therefore, shou ld not be de scribed as " full CCS." • Page 452 - Added "of more than 10 perc e nt " to read as follows: "The EPA further note s that the type s of large , more capital intens ive projects that may trig ger th e " larger modification s" threshold (i .e . , result in an hourly increase in C0 2 emissions of more than 10 percent) .... " This edit is necessary for accuracy in describing the " larg er modifications " threshold. • Page 462 - Replac e d " di stillate " with "fuel " and added "No . " to r ead as follows: "Fo r multifuel-fired stationary combustion turbin es, the BSER is also the use of clean fuels (e . g . , natural gas , ethylene , propan e, naphtha , jet fuel kerosene , fue l oils No . 1 and 2, biodiesel , and landfill gas). " This edit is necessary for clarification and to use the correct termino logy. Conforming e dit hav e also been made on page s 564 and 567. • Pag e 486 - Deleted "an nual " to read as follows: "Th e proposed 219 ,000 MWh total sales criterion was based on . .. " This edit is nece ssary 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 b e able to se ll between 33 to 44 percent of the turbin e's potenti a l e lectric output. " This edit is necessary for accuracy . • Page 533 - Rep laced " the cost-effect iveness of CCS for these units would be much higher than for base load un its" with " CCS woul d be less cost- effective for these unit s than for base load unit s" to read as follows: " In ad dition , because the CCS system would remain idle for much of the time while these units are not running , CCS would be less cost-effecti ve for th ese unit s than for base load units. " This edit more clear ly makes th e point regarding costeffectiveness of CCS. • Page 537 - Added " quality" to read as follows: " Finally , the use of clean fuels will not have any sign ificant energy or non-air quality impacts . " This edit is necessary for accuracy in describing impacts. • Page 548 - Corrected th e number of units from "3 46 " to ''345" to read as follows : " In our analysis , we evaluated 345 N GCC 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 app ly to some modifi e d and reco nstructe d unit s, as tho se terms are defined under part 60. " This correction clarifies that the tenns are not defined in thi s rule . • Page s 693 - 697 - A dded a description of each voluntary consensus standard that is cited in the final rule (e .g ., ANS I , ASTM, ASME and ISO method s) as required by the OFR . • Footnotes - In addition to making minor typographical corrections and clarification s, document ID numbers were added to footnotes referencing public comments for convenience of the read er.

### 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 capab l e of selling greater than 25 MW of electricity to a utility power d i str ibuti on system . " • Page 716 (60.5520(d) introductory paragraph) - Replaced "o f the " with " uniform " and " listed '" with "as described " in the fir st se ntence 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 7 1 6 (60 .55 20(d)( I)) - Added " less" in the first sentence, a nd replaced " distillate oi l No. 1 " with "No. 1 fuel oi l'" and added "fue l oil" in the second sentence to read as follows: ' "

(1) Stationary combustion turbines that are only permitted to bum fuels with a consistent chemical co mposition (i.e., uniform fuels) that result in a consistent emission rate of 160 lb C0 2/MMBtu or less

_ are not subject to any monitoring or reporting requireme nts under thi s subpart. These fuels include . .. No. 1 fue l oil, No. 2 fuel oil, and .... " • Page 7 1 6 (60 . 5520(d)(2)) - Added " not " to read as fo ll ows: "(2) Stationary combustion turbines pern1itted to bum fuels that do not have a consistent chemical composition or that do not have an em ission rate .... ·· • Pages 749, 755 and 758 (60.55 80) - Deleted the definitions of 

### Coal refuse . Oil, and 

### System emergency. The first two terms are not used in this final rul e and are unnecessary and 

### System emergency is listed twice. • Page 752 (60.5580) - Replaced "unit'' with "fac ility'· and "stationary combust ion 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 I GCC to read as follows: 

### "In tegrated gasification comb ined cycle facility or 

### !CCC means a combined cycle facility that is d es igned to burn fuels containing 50 percent (by heat input) or more so lid-deri ved fuel not meeting the definition of natural gas , plus any integrate d equipment that provides electricity or useful thermal output to the affected EGU o r auxiliary equipment. ... " • Page 754 (60 .5580) - Replaced .. (i)'" w ith"'( Ir and .. (iir w ith "(2), .. and deleted "Except as provided under paragraph (ii) of this definition ," in redesignated paragraph ( 1) in the definiti on of 

### Net energy output to read as fo ll ows: 

### "Ne t ene rgy output means: ( I) The net electric or mechanical output from the affected EGU plu s I00 percent of the useful thermal output; or (2) For combined heat and powe r facilities .... " • Page 755 (60.5580) - Rep laced "3 10, 000 " with "306,000'" in the definition of 

### Potential electric output to be consistent with the rounding convention adopted in this fina l rule ( i.e. , numbers o r l ,000 o r g reater have 3 sign ifi cant dig its). The revised definition reads as follows: 

### "Po ten tial electric output means ... (e.g .. a 35 percent effic ient affected EGU wit h a 100 MW (34 1 MMBtu/h) fossil fuel heat input capacity would have a 306.000 MWh 12-mo nth potential e lect ric 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 fo ll ows: Affected EGU " New ly constructed or reconstructed stationary combustion turbine that supplies more than its design efficiency or 50 percent, whichever is less , times its potent ia l 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 nete lectric 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 (Tab le 3) - Added " Yes (steam generating units and IGCC fac ili ties)" and "(stationary combustion turb ines) " 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 li nks : Rev ised 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 - De leted " amb ient air (primary a ir) 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 incom ing 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 recom me nd co rrec ti o n of these inadve rten t e rrors and approva l of th ese c ha nges 

### b y sig nin g 

### and datin g below. 

# &d , Zp; .,:' Dat d / 

### Adm ini s trator. Attachment s cc : Kri s ti e n Knapp/ OA ( I I0 IA)