CFR > Title 18 - Conservation of Power and Water Resources > CHAPTER I—FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY > SUBCHAPTER U—REGULATIONS UNDER THE PUBLIC UTILITY HOLDING COMPANY ACT OF 2005, FEDERAL POWER ACT AND NATURAL GAS ACT (parts 366 to 369) > PART 367—UNIFORM SYSTEM OF ACCOUNTS FOR CENTRALIZED SERVICE COMPANIES SUBJECT TO THE PROVISIONS OF THE PUBLIC UTILITY HOLDING COMPANY ACT OF 2005, FEDERAL POWER ACT AND NATURAL GAS ACT > SUBPART B—General Instructions (§367.2 to §367.30) > 367.5—Accounting period.

367.5—Accounting period.

Each service company must keep its books on a monthly basis so that for each month all transactions applicable to the account, as nearly as may be ascertained, must be entered in the books of the service company. Amounts applicable or assignable to a single or group of associate and non-associate companies must be segregated monthly. Each service company must close its books at the end of each calendar year unless otherwise authorized by the Commission.