U.S. Code of Federal Regulations

Regulations most recently checked for updates: Apr 14, 2026

All TitlesTitle 10Chapter IIPart 504 - PART 504—EXISTING POWERPLANTS
§ 504.2 - Purpose and scope.
§§ 504.3-504.4 - §[Reserved]
§ 504.5 - Prohibitions by order (certifying powerplants under section 301 of FUA, as amended).
§ 504.6 - Prohibitions by order (case-by-case).
§ 504.7 - Prohibition against excessive use of petroleum or natural gas in mixtures—electing powerplants.
§ 504.8 - Prohibitions against excessive use of petroleum or natural gas in mixtures—certifying powerplants.
§ 504.9 - Environmental requirements for certifying powerplants.
Appendix Appendix I - Appendix I to Part 504—Procedures for the Computation of the Real Cost of Capital
Appendix Appendix II - Appendix II to Part 504—Fuel Price Computation
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