[Code of Federal Regulations] [Title 18, Volume 1] [Revised as of April 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 18CFR154.310] [Page 450] TITLE 18--CONSERVATION OF POWER AND WATER RESOURCES CHAPTER I--FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY PART 154--RATE SCHEDULES AND TARIFFS--Table of Contents Subpart D--Material To Be Filed With Changes Sec. 154.310 Zones. If the company maintains records of costs by zone, and proposes a zone rate methodology based on these costs, the statements and schedules in Sec. 154.312 and Sec. 154.313 must reflect costs detailed by zone.