U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 30, 2025

All TitlesTitle 40Chapter IPart 63Subpart UUUUU - and Oil-Fired Electric Utility Steam Generating Units

WHAT THIS SUBPART COVERS
§ 63.9980 - What is the purpose of this subpart?
§ 63.9981 - Am I subject to this subpart?
§ 63.9982 - What is the affected source of this subpart?
§ 63.9983 - Are any fossil fuel-fired electric generating units not subject to this subpart?
§ 63.9984 - When do I have to comply with this subpart?
§ 63.9985 - What is a new EGU?

EMISSION LIMITATIONS AND WORK PRACTICE STANDARDS
§ 63.9990 - What are the subcategories of EGUs?
§ 63.9991 - What emission limitations, work practice standards, and operating limits must I meet?

GENERAL COMPLIANCE REQUIREMENTS
§ 63.10000 - What are my general requirements for complying with this subpart?
§ 63.10001 - [Reserved]

TESTING AND INITIAL COMPLIANCE REQUIREMENTS
§ 63.10005 - What are my initial compliance requirements and by what date must I conduct them?
§ 63.10006 - When must I conduct subsequent performance tests or tune-ups?
§ 63.10007 - What methods and other procedures must I use for the performance tests?
§ 63.10008 - [Reserved]
§ 63.10009 - May I use emissions averaging to comply with this subpart?
§ 63.10010 - What are my monitoring, installation, operation, and maintenance requirements?
§ 63.10011 - How do I demonstrate initial compliance with the emissions limits and work practice standards?

CONTINUOUS COMPLIANCE REQUIREMENTS
§ 63.10020 - How do I monitor and collect data to demonstrate continuous compliance?
§ 63.10021 - How do I demonstrate continuous compliance with the emission limitations, operating limits, and work practice standards?
§ 63.10022 - How do I demonstrate continuous compliance under the emissions averaging provision?
§ 63.10023 - How do I establish my PM CPMS operating limit and determine compliance with it?

NOTIFICATION, REPORTS, AND RECORDS
§ 63.10030 - What notifications must I submit and when?
§ 63.10031 - What reports must I submit and when?
§ 63.10032 - What records must I keep?
§ 63.10033 - In what form and how long must I keep my records?

OTHER REQUIREMENTS AND INFORMATION
§ 63.10040 - What parts of the General Provisions apply to me?
§ 63.10041 - Who implements and enforces this subpart?
§ 63.10042 - What definitions apply to this subpart?
Appendix - Table 1 to Subpart UUUUU of Part 63—Emission Limits for New or Reconstructed EGUs
Appendix - Table 2 to Subpart UUUUU of Part 63—Emission Limits for Existing EGUs
Appendix - Table 3 to Subpart UUUUU of Part 63—Work Practice Standards
Appendix - Table 4 to Subpart UUUUU of Part 63—Operating Limits for EGUs
Appendix - Table 5 to Subpart UUUUU of Part 63—Performance Testing Requirements
Appendix - Table 6 to Subpart UUUUU of Part 63—Establishing PM CPMS Operating Limits
Appendix - Table 7 to Subpart UUUUU of Part 63—Demonstrating Continuous Compliance
Appendix - Table 8 to Subpart UUUUU of Part 63—Reporting Requirements
Appendix - Table 9 to Subpart UUUUU of Part 63—Applicability of General Provisions to Subpart UUUUU
Appendix Appendix A - Appendix A to Subpart UUUUU of Part 63—Hg Monitoring Provisions
Appendix Appendix B - Appendix B to Subpart UUUUU of Part 63—-HCl and HF Monitoring Provisions
Appendix Appendix C - Appendix C to Subpart UUUUU of Part 63—PM Monitoring Provisions
Appendix Appendix D - Appendix D to Subpart UUUUU of Part 63—PM CPMS Monitoring Provisions
Appendix Appendix E - Appendix E to Subpart UUUUU of Part 63—Data Elements
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