18 CFR § 4.90 - Applicability and purpose.

---
identifier: "/us/cfr/t18/s4.90"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "18 CFR § 4.90 - Applicability and purpose."
title_number: 18
title_name: "Conservation of Power and Water Resources"
section_number: "4.90"
section_name: "Applicability and purpose."
chapter_name: "FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY"
subchapter_number: "B"
subchapter_name: "REGULATIONS UNDER THE FEDERAL POWER ACT"
part_number: "4"
part_name: "LICENSES, PERMITS, EXEMPTIONS, AND DETERMINATION OF PROJECT COSTS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "16 U.S.C. 791a-825r; 42 U.S.C. 7101-7352."
regulatory_source: "Order 141, 12 FR 8485, Dec. 19, 1947, unless otherwise noted."
cfr_part: "4"
---


# 4.90 Applicability and purpose.

This subpart implements section 30(b) of the Federal Power Act and provides procedures for obtaining an exemption for constructed or unconstructed small conduit hydroelectric facilities, as defined in § 4.30(b)(30), from all or part of the requirements of Part I of the Federal Power Act, including licensing, and the regulations issued under Part I.

[Order 800, 79 FR 59110, Oct. 1, 2014]