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**Subpart P**

**— Hydrogen Production**  **§98.160 Definition**  **of the source category.** (a) A h ydrogen production source category consists of facilities that produce hydrogen gas sold as a product to other entities. (b) This source category

comprises process units that produce hydrogen by reforming, gasification, oxidation, reaction, or other transformations of feedstocks. (c) This source category

includes merchant hydrogen production facilities located within another facility

if they are not owned by , or under the direct control of, the other facility 's owner and operator. **§98.161 Reporting threshold.**  You must report GHG emissions under this subpart if your facility contains a hydrogen production process and the facility meets the requirements of either §98.2(a)(1) or (a)(2). **§98.162 GHGs to report.**  You must report: (a) CO 2 emissions from each hydrogen production process unit. (b) [Reserved] (c) CO 2 , CH 4 , and N 2 O emissions from each stationary combustion unit other than hydrogen production process units. You must calculate and report these emissions under subpart C of th is part (General Stationary Fuel Combustion Sources) b y following the requirements of subpart C. (d) For CO 2 collected and transferred off site, you must follow the requirements of subpart PP of this part. **§98.163 Calculating GHG emissions.** Page 2 of 12

You must calcul ate and report the annual CO 2 emissions from each h ydrogen production process unit using the procedures specified in either paragraph (a) or (b) of this section. (a) Continuous Emissions Monitoring Systems (CEMS). Calculate and report under this subpart th e CO 2 emissions by operating and maintaining CEMS according to the Tier 4 Calculation Methodology specified in §98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part (General Stationary Fuel Combustion Sources). (b) Fuel and feedstock material balance approach. Calculate and report CO 2 emissions as the sum of the annual emissions associated with each fuel and feedstock used for hydrogen production by

following paragraphs (b)(1) through (3) of this section. The carbon content and molecular weight shall be obtained from the anal yses conducted in accordance with §98.164(b)(2), (b)(3), or (b)(4), as applicable, or from the missing data procedures in §98.165. If the anal ys es are performed annuall y, then the annual value shall be use d as the monthly average. If the analy ses are performed more frequentl y than monthly , use the arithmetic average of values obtained during the month as the monthly average. (1) Gaseous fuel and feedstock. You must calculate the annual CO 2 emissions from ea ch gaseous fuel and feedstock according to Equation P

- 1 of this section:

Where: CO 2 = Annual CO 2 process emissions arising from fuel and feedstock consumption (metric tons/y

r). Fdstk n = Volume or mass of the gaseous fuel or feedstock used in month n (scf (at standard conditions of 68 °F and atmospheric pressure) or kg of fuel or feedstock).Page 3 of 12

CC n = Average carbon content of the gaseous fuel or feedstock for month n (kg carbon per kg o f fuel or feedstock). MW n = Average molecular weight of the gaseous fuel or feedstock for month n (kg/kg

mole). If you measure mass, the term “MWn/MVC” is replaced with “1”. MVC = Molar volume conversion factor (849.5 scf per kg

- mole at standard conditions ). k = Months in the year. 44/12 = Ratio of molecular weights, CO 2 to carbon. 0.001 = Conversion factor from kg to metric tons. (2) Liquid fuel and feedstock. You must calculate the annual CO 2 emissions from each liquid fuel and feedstock according to Equation P

- 2 of this section:

Where: CO 2 = Annual CO 2 emissions arising from fuel and feedstock consumption (metric tons/y r). Fdstk n = Volume or mass of the liquid fuel or feedstock used in month n (gallons or kg of fuel or feedstock). CC n = Average carbon c ontent of the liquid fuel or feedstock, for month n (kg carbon per gallon or kg of fuel or feedstock). k = Months in the year. 44/12 = Ratio of molecular weights, CO 2 to carbon. 0.001 = Conversion factor from kg to metric tons. (3) Solid fuel and feedstock

. You must calculate the annual CO 2 emissions from each solid fuel and feedstock according to Equation P

- 3 of this section:Page 4 of 12

Where: CO 2 = Annual CO 2 emissions from fuel and feedstock consumption (metric tons/y r). Fdstk n = Mass of solid fuel or feedstock used in month n (kg of fuel or feedstock). CC n = Average carbon content of the solid fuel or feedstock, for month n (kg carbon per kg of fuel or feedstock). k = Months in the year. 44/12 = Ratio of molecular weights, CO 2 to carbon. 0.001 = Conversion factor from kg to metric tons. (c) If GHG emissions from a hydrogen production process unit are vented through the same stack as an y combustion unit or process equipment that reports CO 2 emissions using a CEMS that complies wi th the Tier 4 Calculation Methodology in subpart C of this part (General Stationary

Fuel Combustion Sources), then the calculation methodology in paragraph (b) of this section shall not be used to calculate process emissions. The owner or operator shall report under this subpart the combined stack emissions according to the Tier 4 Calculation Methodology in §98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part (General Stationary

Fuel Combustion Sources). **§98.164 Monitoring and**  **QA/QC requirements.** The GHG emissions data for h ydrogen production process units must be quality

- assured as specified in paragraphs (a) or (b) of this section, as appropriate for each process unit: (a) If a CEMS is used to measure GHG emissions, then the facilit y must comply with the monitoring and QA/QC procedures specified in §98.34(c). (b) If a CEMS is not used to measure GHG emissions, then you must:Page 5 of 12

(1) Calibrate all oil and gas flow meters that are used to measure liquid and gaseous fuel and feedstoc k volumes (except for gas billing meters) according to the monitoring and QA/QC requirements for the Tier 3 methodology in §98.34(b)(1). Perform oil tank drop measurements (if used to quantify

liquid fuel or feedstock consumption) according to §98.34(b)(2) . Calibrate all solids weighing equipment according to the procedures in §98.3(i). (2) Determine the carbon content and the molecular weight annually of standard gaseous hydrocarbon fuels and feedstocks having consistent composition ( e.g., natural gas). Fo r other gaseous fuels and feedstocks ( e.g., biogas, refinery gas, or process gas), sample and anal yz e no less frequentl y than weekly to determine the carbon content and molecular weight of the fuel and feedstock. (3) Determine the carbon content of fuel oi l, naphtha, and other liquid fuels and feedstocks at least monthly , except annually for standard liquid hydrocarbon fuels and feedstocks having consistent composition, or upon delivery for liquid fuels and feedstocks delivered by bulk transport ( e.g., by

truck or rail). (4) Determine the carbon content of coal, coke, and other solid fuels and feedstocks at least monthly , except annually for standard solid hydrocarbon fuels and feedstocks having consistent composition, or upon delivery for solid fuels and feedstocks delivered b y bulk transport ( e.g., by

truck or rail). (5) You must use the following applicable methods to determine the carbon content for all fuels and feedstocks, and molecular weight of gaseous fuels and feedstocks. Alternativel y, yo u may us e the results of chromatographic analy sis of the fuel and feedstock, provided that the chromatograph is operated, maintained, and calibrated according to the manufacturer'sPage 6 of 12

instructions; and the methods used for operation, maintenance, and calibration of the chromatograph are documented in the written monitoring plan for the unit under §98.3(g)(5). (i) ASTM D1945

- 03 Standard Test Method for Analy sis of Natural Gas by Gas Chromatograph y (incorporated b y reference, see §98.7). (ii) ASTM D1946

- 90 (Reapproved 2 006), Standard Practice for Analy sis of Reformed Gas b y Gas Chromatography (incorporated b y reference, see §98.7). (iii) ASTM D2013

- 07 Standard Practice of Preparing Coal Samples for Analy sis (incorporated b y reference, see §98.7). (iv) ASTM D2234/D2234M

- 0 7 Standard Practice for Collection of a Gross Sample of Coal (incorporated b y reference, see §98.7). (v) ASTM D2597

- 94 (Reapproved 2004) Standard Test Method for Analy sis of Demethanized Hydrocarbon L iquid Mixtures Containing Nitrogen and Carbon Dioxide by Gas Chromatograph y (incorporated b y reference, see §98.7). (vi) ASTM D3176

- 89 (Reapproved 2002), Standard Practice for Ultimate Analy sis of Coal and Coke (incorporated b y reference, see §98.7). (vii) ASTM D3238

- 95 (Reapproved 2005), Standard Test Method f or Calculation of Carbon Distribution and Structural Group Analy sis of Petroleum Oils by the n

- d

- M Method (incorporated b y reference, see §98.7). (viii) ASTM D4057

- 06 Standard Practice for Manual Sampling of Petroleum and Petroleum Products (incorporated b y reference, see §98.7). (ix) ASTM D4177

- 95 (Reapproved 2005) Standard Practice for Automatic Sampling of Petroleum and Petroleum Products (incorporated by reference, see §98.7).Page 7 of 12

(x) ASTM D5291

- 02 (Reapproved 2007), Standard Test Methods for Instrumental D etermination of Carbon, Hydrogen, and Nitrogen in Petroleum Products and Lubricants (incorporated b y reference, see §98.7). (xi) ASTM D5373

- 08 Standard Test Methods for Instrumental Determination of Carbon, Hydrogen, and Nitrogen in L aboratory Samples of C oal (incorporated b y reference, see §98.7). (xii) ASTM D6609

- 08 Standard Guide for Part

- Stream Sampling of Coal (incorporated by reference, see §98.7). (xiii) ASTM D6883

- 04 Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges , Trucks, or Stockpiles (incorporated b y reference, see §98.7). (xiv) ASTM D7430

- 08ae1 Standard Practice for Mechanical Sampling of Coal (incorporated b y reference, see §98.7). (xv) ASTM UOP539

- 97 Refinery Gas Anal ys is by

Gas Chromatography

(incorporated b y reference, see §98.7). (xvi) GPA 2261

- 00 Analysis for Natural Gas and Similar Gaseous Mixtures by Gas Chromatograph y (incorporated b y reference, see §98.7). (xvii) I SO 3170: Petroleum L iquids

—Manual sampling

—Third Edition (incorporated b y reference, see §98.7). (xviii) I SO 3171: Petroleum L iquids

— Automatic pipeline sampling

— Second Edition (incorporated b y reference, see §98.7). **§98.165 Procedures for estimating missing data.**  A complete record of all measured parameters used in the GHG emissions calculatio ns is required. Therefore, whenever a quality

- assured value of a required parameter is unavailable (e.g., if a meter malfunctions during unit operation), a substitute data value for the missingPage 8 of 12

parameter must be used in the calculations as specified in par agraphs (a), (b), and (c) of this section:(a) For each missing value of the monthly fuel and feedstock consumption, the substitute data value must be the best available estimate of the fuel and feedstock consumption, based on all available process data (e .g., hydrogen production, electrical load, and operating hours). You must document and keep records of the procedures used for all such estimates. (b) For each missing value of the carbon content or molecular weight of the fuel and feedstock, the substitut e data value must be the arithmetic average of the quality

- assured values of carbon contents or molecular weight of the fuel and feedstock immediately preceding and immediately

following the missing data incident. If no quality

- assured data on carbon conte nts or molecular weight of the fuel and feedstock are available prior to the missing data incident, the substitute data value must be the first quality

- assured value for carbon contents or molecular weight of the fuel and feedstock obtained after the missi ng data period. You must document and keep records of the procedures used for all such estimates. (c) For missing CEMS data, you must use the missing data procedures in §98.35. **§ 98. 166**  **Data reporting requirements.** In addition to the information required b y § 98. 3(c), each annual report must contain the information specified in paragraphs (a) or (b) of this section, as appropriate, and paragraphs (c) through ( e ) of this section: (a) If a CEMS is used to measure CO 2 e missions, then you must report the relevant information required under § 98. 36 for the Tier 4 Calculation Methodology and the following information in this paragraph (a): (1) Unit identification number and annual CO 2 emissions.Page 9 of 12

(2) Annual quantit y of h ydro gen produced (metric tons) for each process unit. (3) Annual quantit y of ammonia produced (metric tons), if applicable, for each process unit. (b) If a CEMS is not used to measure CO 2 emissions, then you must report the following information for each h ydrogen production process unit: (1) Unit identification number and annual CO 2 emissions. (2) Reserved

. (3) Annual quantit y of h ydrogen produced (metric tons). (4) Annual quantit y of ammo nia intentionally produced as a desired product , if applicable (metric tons). (5) Reserved

. (6) Reserved

. (7) Name and annual quantity (metric tons) of each carbon

- containing fuel and feedstock. (c) Quantity

of CO 2 collected and transferred off site in either gas, liquid, or solid forms, following the requirements of subpart PP of this part. (d) Annual quantit y of carbon other than CO 2 collected and transferred off site in either gas, liquid, or solid forms (kg carbon) , excluding methanol

. (e) Annual quanti ty

of methanol intentionally produc ed as a desired product , if applicable, (metric tons) for each process unit. **§ 98. 167**  **Records that must be retained.** In addition to the information required b y § 98. 3(g), you must retain the records specified in para graphs (a) through ( e ) of this section for each hydrogen production facility

.Page 10 of 12

(a) If a CEMS is used to measure CO 2 emissions, then you must retain under this subpart the records required for the Tier 4 Calculation Methodology in § 98. 37. (b) If a CEMS is n ot used to measure CO 2 emissions, then you must retain records of all anal ys es and calculations conducted as listed in § § 98. 166(b), (c), and (d). (c) For units using the calculation methodologies described in § 98. 163(b), the records required under § 98. 3(g) must include both the company records and a detailed explanation of how compan y records are used to estimate the following: (1) Fuel and feedstock consumption, when solid fuel and feedstock is combusted and a CEMS is not used to measure GHG emissions. (2) Fossil fuel consumption, when, pursuant to § 98. 33(e), the owner or operator of a unit that uses CEMS to quantify CO 2 emissions and that combusts both fossil and biogenic fuels separately reports the biogenic portion of the total annual CO 2 emissions. (3) Sorbent usage, if the methodology in § 98. 33(d) is used to calculate CO 2 emissions from sorbent. (d) The owner or operator must document the procedures used to ensure the accuracy of the estimates of fuel and feedstock usage and sorbent usage (as applicable) in § 98. 163(b), including, but not limited to, calibration of weighing equipment, fuel and fee dstock flow meters, and other measurement devices. The estimated accuracy of measurements made with these devices must also be recorded, and the technical basis for these estimates must be provided. (e) Verification software records . You must keep a record of the file generated by the verification software specified in § 98 .5(b) for the applicable data specified in paragraphs (e)(1) through (12) of this section. Retention of this file satisfies the recordkeeping requirement for the data in paragraphs (e)(1) through (12) of this section.Page 11 of 12

(1) Indicate whether the monthly consumption of each gaseous fuel or feedstock is measured as mass or volume (Equation P

- 1 of § 98.163 ). (2) Monthly

volume of the gaseous fuel or feedstock (scf at standard conditions of 68 °F and atmospheric pressure) (Equation P

- 1). (3) Monthly

mass of the gaseous fuel or feedstock (kg of fuel or feedstock) (Equation P

1). (4) Average monthl y carbon content of the gaseous fuel or feedstock (kg C per kg of fuel or feedstock) (Equation P

- 1). (5 ) Average monthl y molecular weight of the gaseous fuel or feedstock (kg/kg

- mole) (Equation P

- 1). (6) Indicate whether the monthly consumption of each liquid fuel or feedstock is measured as mass or volume (Equation P

- 2 of § 98.163 ). (7) Monthly

volume of the liquid fuel or feedstock (gallons of fuel or feedstock) (Equation P

- 2). (8) Monthly

mass of the liquid fuel or feedstock (kg of fuel or feedstock) (Equation P

- 2). (9) Average monthl y carbon content of the liquid fuel or feedstock (kg C per gallon of fue l or feedstock) (Equation P

- 2). (10) Average monthl y carbon content of the liquid fuel or feedstock (kg C per kg of fuel or feedstock) (Equation P

- 2). (11) Monthly

mass of solid fuel or feedstock (kg of fuel and feedstock) (Equation P

- 3 of § 98.163 ). (12) Average monthl y carbon content of the solid fuel or feedstock (kg C per kg of fuel and feedstock) (Equation P

- 3).Page 12 of 12

**§98.168 Definitions.**  All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part.