---
kind: "unit"
title: "42"
title_heading: "The Public Health and Welfare"
key: "ch71/schII"
level: "subchapter"
label: "Subchapter II"
heading: "Research, Development, and Demonstration"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/42/ch71-schII"
sections_count: 3
---

# Subchapter II — Research, Development, and Demonstration

Title 42 — The Public Health and Welfare › Chapter 71 — Solar Energy

## Sections

- [§5551...5556. Repealed.](/usc/42/5551...5556.md)
- [§5556a. Solar photovoltaic energy systems studies and acquisitions by Secretary of Energy; scope, contents, and submission dates for reports; acquisition authority and requirements; authorization of appropriations](/usc/42/5556a.md)
- [§5557...5566. Repealed.](/usc/42/5557...5566.md)