3. Contemplated alterations, additions, or retirements in system generating plants. 4. Electric generating equipment owned or operated as of December 31.

5. Electric power received from or delivered to other systems.

6. Maps of electric system.

[Order 183, 21 F.R. 869, Feb. 8, 1956, as amended by Order 224, 25 F.R. 9044, Sept. 21, 1960]

NOTE: Form 12-D prescribed by § 141.55 was amended by Order 224, 25 F.R. 9044, Sept. 21, 1960, Order 312, 30 FR. 16106, Dec. 28, 1965.

§ 141.56 Form No. 12E, Monthly load

statement.

This form is a monthly supplement to Schedule 14 of Form No. 12 (§ 141.51), and is designed to obtain monthly information concerning net energy for load and peak load of electric utility systems. [Order 141, 12 F.R. 8596, Dec. 19, 1947]

NOTE: Form 12E prescribed by § 141.56 was amended by Order 372, 33 F.R. 15711, Oct. 24, 1968.

§ 141.57 Form No. 12F, Power line and generating plant data.

This form is a supplement to Schedules 16 and 18 of Form No. 12 (§ 141.51), and is designed to obtain information concerning power line and generating plant data.

[Order 141, 12 F.R. 8596, Dec. 19, 1947]

NOTE: Form 12F prescribed by § 141.57 was amended by Order 372, 33 F.R. 1571, Oct. 24, 1968.

§ 141.58 Report of bulk electric power supply interruptions.

not be reported. For the purpose of this rule a report or a part of a report may be made jointly by two or more entities. (b) Telephonic reports. Every electric utility, licensee, and other entity engaged in the generation or transmission of electric energy shall report to the Commission's Washington office by telephone any loss in service for 15 minutes or more of bulk power supply to aggregate loads in excess of 200,000 kw. Calls should be placed as soon as practicable without unduly interfering with service restoration and in any event within 1 hour after the beginning of the interruption to Area Code 202, number 9621307. This number is in service at all times. The information supplied in the initial telephonic report should include at least the approximate territory affected by the interruption, the time of occurrence, and estimate of the number of customers and amount of load involved, and an appraisal of the likely duration of the interruption. To the extent known or suspected, the report desirably will include a description of the cause(s) of the interruption and a description of the initial incident resulting in the interruption. The Commission or the Chief of its Bureau of Power may require further reports during the period of interruption and restoration of service, such reports to be made by telephone or telegraph or both as required.

(c) Telegraphic reports. Every electric utility, licensee and other entity engaged in the generation or transmission of electric energy shall report to the Commission's Washington office by telegram any loss in service for 15 minutes or more of bulk power supply to aggregate loads exceeding the lesser of 25,000 kw or half the system load, and not required to be reported under paragraph (b) of this section. The report shall be sent to the Chief, Bureau of Power, Federal Power Commission, 441 G Street NW., Washington, D.C. within 2 hours after the beginning of the service interruption. The information supplied shall include the approximate territory affected by the interruption, a description of the initial incident resulting in the interruption, cause of the interruption or an appraisal of the likely duration of the interruption, and an estimate of the number of customers and amount of load involved. To the extent known or suspected, the report should include the time of occurrence and the time or times of restoration. Telephonic

(a) Definitions. For the purpose of this rule, a bulk electric power supply interruption shall be any interruption or loss of service to customers of any electric utility, licensee, or other entity engaged in the generation or transmission of electric energy caused by or involving an outage of any generating unit or of electric facilities operating at a nominal voltage of 69 kv or higher. In determining the aggregate of loads which are interrupted, any load which is interrupted in accordance with the provisions of contracts permitting interruption in service shall not be included. If the interruption affects only a single ultimate customer, the interruption need

reports in lieu of telegraphic reports will be accepted (Area Code 202, Number 9621307) if preferred by the respondent. (d) Report of details. (1) If so directed by the Commission or the Chief of its Bureau of Power, an entity experiencing a service interruption of bulk power supply reportable under paragraph (b) or (c) of this section shall submit a full report of the circumstances of the interruption and the conclusions the entity has drawn therefrom. The report shall be filed at such time subsequent to the submittal of the initial report by telephone or telegram as may be directed by the Commission or the Chief of its Bureau of Power.

(2) The report shall be prepared in such detail as may be appropriate to the severity and complexity of the incident experienced and should include an account understandable to the informed layman in addition to the following technical and other information:

(i) The cause or causes of the initial disturbance clearly described, including the manner in which the incident was initiated.

(ii) A description of any operating conditions of an unusual nature preceding the initiation of the disturbance.

(iii) If the interruption was geographically widespread, an enumeration of the sequence of events contributing to its spread.

(iv) An account of the measures taken which prevented further spreading in the loss of service, e.g., manual or automatic load shedding, unit isolation, or system sectionalization. These actions and all chronicled events should be keyed to a

record of the coincident power frequencies which occurred.

(v) A description of the measures taken to restore service with particular evaluation of the availability of startup power and the ease or difficulty of restoration.

(vi) A statement of the capacity of the transmission lines into the area of load interruption, the generating capacity in operation in the area at the beginning of the disturbance, and the actual loading on the lines and generating units at that time.

(vii) A summary description of any equipment damage and the status of its repair.

(viii) An evaluation of the impact of the interruption on people and industries in the affected area, including a copy of materials in the printed news media indicative of the impact.

(ix) Information on the steps taken, being taken, or planned by the utility, to prevent recurrence of interruption of a similar nature, to ease problems of service restoration, and to minimize impacts on the public and the customers of any future service interruption. [Order 331, 31 F.R. 16691, Dec. 30, 1966] § 141.100 General requirements for annual reports to stockholders and others.

All annual reports to stockholders and others shall include an appropriate summary of the investment tax credits generated and utilized and a statement of the accounting method elected by the company in connection with the utilization of the credits.

[Order 290, 29 F.R. 18215, Dec. 23, 1964]