Page 1 of 13

**Subpart P**

**— Hydrogen Production**  § 98.160 Definition of the source category. (a) A hydrogen 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 emission s 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 emission s from each hydrogen production process unit. (b ) [Reserved] (c) CO 2 , CH 4 , and N 2O emissions from each stationary combustion unit other than hydrogen production process units. You must calculate and report these emissions under subpart C ofPage 2 of 13

this part (General Stationary Fuel Combustion Sources) by 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. You must calculate and report the annual CO 2 emission s from each hydrogen p roduction 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 the CO 2 emission s 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 emission s as the sum of the annual emissions associated with each fuel and feedstock used for hydrogen production by following paragraphs (b)(1) through (b)(3) of this section. The carbon content and molecular weight shall be obtained from the analyses 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 analyses are performed annually, then the annual value shall be used as the monthly average. If the analyses are performed mo re frequentlyPage 3 of 13

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 emission s from each gaseous fuel and feedstock according to Equation P

– 1 o f this section:

Where:
CO 2 = Annual CO 2 process emissions arising from fuel and feedstock consumption (metric tons/yr). Fdstkn = 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). CC n = Average carbon content of the gaseous fuel or feedstock for month n (kg carbon per kg of fuel or feedstock). MWn = Average molecular weight of the gaseous fuel or feedstock for month n (kg/kg

-mole). If you measure mass, the term “MW n /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 emission s from each liquid fuel and feedstock according to Equation P

– 2 of this section:Page 4 of 13

Where:
CO 2 = Annual CO 2 emission s arising from fuel and feedstock consumption (metric tons/yr). Fdstkn = Volume or mass of the liquid fuel or feedstock used in month n (gallons or kg of fuel or feedstock). CC n = Average carbon content 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 emission s from each solid fuel and feedstock according to Equation P

– 3 of this section:

Where:
CO 2 = Annual CO 2 emission s from fuel and feedstock consumption in metric tons per month (metric tons/yr). Fdstkn = 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 any combustion unit orPage 5 of 13

process equipment that reports CO 2 emission s using a CEMS that complies with the Tier 4 Calculation Methodology in subpart C of this pa rt (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 hydrogen produ ction 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 facility 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: (1) Calibrate all oil and gas flow meters that are used to measure liquid and gaseous feedstock 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 orPage 6 of 13

feedstock consumption) according to §98.34(b)(2). Calibrate all solids weighing equipment according to the procedures i n §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). For other gaseous fuels and feedstocks ( e.g. , biogas, refinery gas, or process gas), sample and analyze no less frequently than weekly to determine the carbon content and molecular weight of the fuel and feedstock. (3) Determine the carbon content of fuel oil, 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 by 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. Alternatively,Page 7 of 13

you may use the results of chromatographic analysis of the fuel and fe edstock, provided that the chromatograph is operated, maintained, and calibrated according to the manufacturer's 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 Analysis of Natural Gas by Gas Chromatography (incorporated by reference,
see §98.7). (ii) ASTM D1946

– 90 (Reapproved 2006), Standard Practice for Analysis of Reformed Gas by Gas Chromatography (incorporated by reference, see §98.7). (iii) ASTM D2013

– 07 Standard Practice of Preparing Coal Samples for Analysis (incorporated by reference, see §98.7). (iv) ASTM D2234/D2234M

– 07 Standard Practice for Collection of a Gross Sample of Coal (incorporated by reference, see §98.7). (v) ASTM D2597

– 94 (Reapproved 2004) Standard Test Method for Analysis of Demethanized Hydrocarbon Liquid Mixtures Containing Nitrogen and Carbon Dioxide by Gas Chromatography (incorporated by reference, see §98.7). (vi) ASTM D3176

– 89 (Reapproved 2002), Standard Practice for Ultimate Analysis of Coal and Coke (incorporated by reference,
see §98.7).Page 8 of 13

(vii) ASTM D3238

– 95 (Reapproved 2005), Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the n
- d
-M Method (incorporated by reference, see §98.7). (viii) ASTM D4057

– 06 Standard Practice for Manual Sampling of Petroleum and Petroleum Products (incorporated by 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). (x) ASTM D5291

– 02 (Reapproved 2007), Standard Test Methods for Instrumental Determination of Carbon, Hydrogen, and Nitrogen i n Petroleum Products and Lubricants (incorporated by reference,
see §98.7). (xi) ASTM D5373

– 08 Standard Test Methods for Instrumental Determination of Carbon, Hydrogen, and Nitrogen in Laboratory Samples of Coal (incorporated by 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 by reference, see §98.7). (xiv) ASTM D7430

– 08ae1 Standard Practice for Mechanical Sampling of Coal (incorporated by reference, see §98.7).Page 9 of 13

(xv) ASTM UOP539

– 97 Refinery Gas Analysis by Gas Chromatography (incorporated by reference, see §98.7). (xvi) GPA 2261

– 00 Analysis for Natural Gas and Similar Gaseous Mixtures by Gas Chromatography (incorporated by reference, see §98.7). (xvii) ISO 3170: Petroleum Liquids

—Manual sampling

—Third Edition (incorporated by reference, see §98.7). (xviii) ISO 3171: Petroleum Liquids

—Automatic pipeline sampling

—Second Edition (incorporated by reference, see §98.7) . § 98.165 Procedures for estimating missing data. A complete record of all measured parameters used in the GHG emissions calculations 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 missing parameter must be u sed in the calculations as specified in paragraphs (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 consumpt ion, 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.Page 10 of 13

(b) For each missing value of the carbon content or molecular weight of the fuel and feedstock, the substitute 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 contents 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 missing 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 by §98.3(c), each annual report must contain the information specified in paragraphs (a) or (b) of this section, as appropriate, and paragraphs (c) and (d) of this section: (a) If a CEMS is used to measure CO 2 emis sion s, 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 emission s.Page 11 of 13

(2) Annual quantity of hydrogen produced (metric tons) for each process unit . (3) Annual quantity of ammonia produced (metric tons), if applicable, for each process unit . (b) If a CEMS is not used to measure CO 2 emission s, then you
mu st report the following information for each hydrogen production process unit: (1) Unit identification number and annual CO 2 emission s. (2) Monthly consumption of each fuel and feedstock used for hydrogen production and its type (scf or kg of gaseous fuels and feedstocks, gallons or kg of liquid fuels and feedstocks, kg of solid fuels and feedstocks). (3) Annual quantity of hydrogen produced (metric tons). (4) Annual quantity of ammonia produced, if applicable (metric tons). (5) Monthly anal yses of carbon content for each fuel and feedstock used in hydrogen production (kg carbon/kg of gaseous and solid fuels and feedstocks, kg carbon per gallon or kg of liquid fuels and feedstocks). (6) Monthly analyses of the molecular weight of gaseous fue ls and feedstocks (kg/kg

-mole) used, if any. (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.Page 12 of 13

(d) Annual quantity of carbon other than CO 2 collected and transferred off site in either gas, liquid, or solid forms (kg carbon). § 98.167 Records that must be retained. In addition to the information required by §98.3(g), you must retain the records specified in paragraphs (a) through (b) of this section for each hydrogen production facility. (a) If a CEMS is used to measure CO 2 emission s, then you must retain under this subpart the records required for the Tier 4 Calculation Methodology in §98.37. (b) If a CEMS is not used to measure CO 2 emission s, then you must retain records of all analyses 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 company 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 fuelsPage 13 of 13

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 limite d to, calibration of weighing equipment, fuel and feedstock 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. § 9 8.168 Definitions. All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part.