---
kind: "section"
citation: "40 C.F.R. § 98.66"
title: "40"
number: "98.66"
heading: "Data reporting requirements."
url: "https://uscodex.org/cfr/40/98.66"
---

# §98.66. Data reporting requirements.


In addition to the information required by [§ 98.3(c)](/cfr/40/98.3.md?p=c), you must report the following information at the facility level:

- (a) [Reserved]
- (b) **Type of smelter technology used.**
- (c) **The following PFC-specific information on an annual basis—**
  - (1) Perfluoromethane emissions and perfluoroethane emissions from anode effects in all prebake and all Søderberg electrolysis cells combined.
  - (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 (%)).
  - (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.
- (d) **Method used to measure the frequency and duration of anode effects (or overvoltage).**
- (e) **The following CO<I>2</I>-specific information for prebake cells—**
  - (1) Annual anode consumption if using the method in [§ 98.63(g)](/cfr/40/98.63.md?p=g).
  - (2) **Annual CO<I>2</I> emissions from the smelter.**
- (f) **The following CO<I>2</I>-specific information for Søderberg cells—**
  - (1) Annual paste consumption if using the method in [§ 98.63(g)](/cfr/40/98.63.md?p=g).
  - (2) **Annual CO<I>2</I> emissions from the smelter.**
- (g) [Reserved]
- (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).

## Notes

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 79156, Dec. 17, 2010; 79 FR 63784, Oct. 24, 2014; 81 FR 89253, Dec. 9, 2016]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 79156, Dec. 17, 2010; 79 FR 63784, Oct. 24, 2014; 81 FR 89253, Dec. 9, 2016]