---
kind: "section"
citation: "40 C.F.R. § 1036.615"
title: "40"
number: "1036.615"
heading: "Engines with Rankine cycle waste heat recovery and hybrid powertrains."
url: "https://uscodex.org/cfr/40/1036.615"
---

# §1036.615. Engines with Rankine cycle waste heat recovery and hybrid powertrains.


This section specifies how to generate advanced-technology emission credits for hybrid powertrains that include energy storage systems and regenerative braking (including regenerative engine braking) and for engines that include Rankine-cycle (or other bottoming cycle) exhaust energy recovery systems. This section applies only for model year 2020 and earlier engines.

- (a) **Pre-transmission hybrid powertrains.** Test pre-transmission hybrid powertrains with the hybrid engine procedures of [40 CFR part 1065](/cfr/40/part1065.md) or with the post-transmission procedures in [§ 1036.545](/cfr/40/1036.545.md). Pre-transmission hybrid powertrains are those engine systems that include features to recover and store energy during engine motoring operation but not from the vehicle's wheels. Engines certified with pre-transmission hybrid powertrains must be certified to meet the diagnostic requirements as specified in [§ 1036.110](/cfr/40/1036.110.md) with respect to powertrain components and systems; if different manufacturers produce the engine and the hybrid powertrain, the hybrid powertrain manufacturer may separately certify its powertrain relative to diagnostic requirements.
- (b) **Rankine engines.** Test engines that include Rankine-cycle exhaust energy recovery systems according to the procedures specified in subpart F of this part unless we approve alternate procedures.
- (c) **Calculating credits.** Calculate credits as specified in [subpart H](/cfr/40/subpartH.md) of this part. Credits generated from engines and powertrains certified under this section may be used in other averaging sets as described in [§ 1036.740(c)](/cfr/40/1036.740.md?p=c).
- (d) **Off-cycle technologies.** You may certify using both the provisions of this section and the off-cycle technology provisions of [§ 1036.610](/cfr/40/1036.610.md), provided you do not double-count emission benefits.

## Notes

### Amendments

[88 FR 4487, Jan. 24, 2023, as amended at 89 FR 29763, Apr. 22, 2024]

### Authority

Authority: 42 U.S.C. 7401—7671q.

### Source

Source: 88 FR 4487, Jan. 24, 2023, unless otherwise noted.

### Amendments

[88 FR 4487, Jan. 24, 2023, as amended at 89 FR 29763, Apr. 22, 2024]