40 CFR § 76.13 - Compliance and excess emissions.

---
identifier: "/us/cfr/t40/s76.13"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 76.13 - Compliance and excess emissions."
title_number: 40
title_name: "Protection of Environment"
section_number: "76.13"
section_name: "Compliance and excess emissions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "76"
part_name: "ACID RAIN NITROGEN OXIDES EMISSION REDUCTION PROGRAM"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7601 and 7651"
regulatory_source: "60 FR 18761, Apr. 13, 1995, unless otherwise noted."
cfr_part: "76"
---


# 76.13 Compliance and excess emissions.

Excess emissions of nitrogen oxides under § 77.6 of this chapter shall be calculated as follows:

(a) For a unit that is not in an approved averaging plan:

(1) Calculate EE<sub>i</sub> for each portion of the calendar year that the unit is subject to a different NO<sub>X</sub> emission limitation:

where:

EE<sub>i</sub> = Excess emissions for NO<sub>X</sub> for the portion of the calendar year (in tons);

R<sub>ai</sub> = Actual average emission rate for the unit (in lb/mmBtu), determined according to part 75 of this chapter for the portion of the calendar year for which the applicable emission limitation R<sub>l</sub> is in effect;

R<sub>li</sub> = Applicable emission limitation for the unit, (in lb/mmBtu), as specified in § 76.5, 76.6, or 76.7 or as determined under § 76.10;

HI
<sup>i</sup> = Actual heat input for the unit, (in mmBtu), determined according to part 75 of this chapter for the portion of the calendar year for which the applicable emission limitation, R<sub>l</sub>, is in effect.

(2) If EE<sub>i</sub> is a negative number for any portion of the calendar year, the EE value for that portion of the calendar year shall be equal to zero (e.g., if EE<sub>i</sub> = −100, then EE<sub>i</sub> = 0).

(3) Sum all EE<sub>i</sub> values for the calendar year:

where:

EE = Excess emissions for NO<sub>X</sub> for the year (in tons);

n = The number of time periods during which a unit is subject to different emission limitations; and

(b) For units participating in an approved averaging plan, when all the requirements under § 76.11(d)(1) are not met,

where:

EE = Excess emissions for NO<sub>X</sub> for the year (in tons);

R<sub>ai</sub> = Actual annual average emission rate for NO<sub>X</sub> for unit i, (in lb/mmBtu), determined according to part 75 of this chapter;

R<sub>li</sub> = Applicable emission limitation for unit i, (in lb/mmBtu), as specified in § 76.5, 76.6, or 76.7;

HI<sub>i</sub> = Actual annual heat input for unit i, mmBtu, determined according to part 75 of this chapter;

n = Number of units in the averaging plan.