---
kind: "unit"
title: "10"
title_heading: "Energy"
key: "chII/subchE"
level: "subchap"
label: "Subchapter E"
heading: "Alternate Fuels"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/10/chII-subchE"
sections_count: 107
---

# Subchapter E — Alternate Fuels

Title 10 C.F.R. — Energy › Chapter II — Department of Energy

## Contents

- [Part 500 — Definitions](/cfr/10/chII-subchE-part500.md)
- [Part 501 — Administrative Procedures and Sanctions](/cfr/10/chII-subchE-part501.md)
- [Part 503 — New Facilities](/cfr/10/chII-subchE-part503.md)
- [Part 504 — Existing Powerplants](/cfr/10/chII-subchE-part504.md)
- [Part 508 — Part 508 [reserved]](/cfr/10/chII-subchE-part508.md)
- [Part 516 — Part 516 [reserved]](/cfr/10/chII-subchE-part516.md)