{"data":{"id":"us/40-cfr-98.66","jurisdiction":"us","citation":"40 CFR 98.66","heading":"Data reporting requirements.","body":"In addition to the information required by § 98.3(c), you must report the following information at the facility level:\n(a) [Reserved]\n(b) Type of smelter technology used.\n(c) The following PFC-specific information on an annual basis:\n(1) Perfluoromethane emissions and perfluoroethane emissions from anode effects in all prebake and all Søderberg electrolysis cells combined.\n(2) Anode effect minutes per cell-day (AE-mins/cell-day), anode effect frequency (AE/cell-day), anode effect duration (minutes). (Or anode effect overvoltage factor ((kg CF4/metric ton Al)/(mV/cell day)), potline overvoltage (mV/cell day), current efficiency (%)).\n(3) Smelter-specific slope coefficients (or overvoltage emission factors) and the last date when the smelter-specific slope coefficients (or overvoltage emission factors) were measured.\n(d) Method used to measure the frequency and duration of anode effects (or overvoltage).\n(e) The following CO2-specific information for prebake cells:\n(1) Annual anode consumption if using the method in § 98.63(g).\n(2) Annual CO2 emissions from the smelter.\n(f) The following CO2-specific information for Søderberg cells:\n(1) Annual paste consumption if using the method in § 98.63(g).\n(2) Annual CO2 emissions from the smelter.\n(g) [Reserved]\n(h) Exact data elements required will vary depending on smelter technology (e.g., point-feed prebake or Søderberg) and process control technology (e.g., Pechiney or other).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 98—MANDATORY GREENHOUSE GAS REPORTING","Subpart F—Aluminum Production"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"6bf1b8d8224e79666326964484a91c8adc68cd1ac3dea8c8259a891af0377814","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-98.65","next":"us/40-cfr-98.67"},"notice":"GroundRules: Original legal text. Not legal advice."}