FERC Account 352: Transmission Structures and Improvements

FERC Account 352 records the cost of structures and improvements used in electric transmission operations.

Definition

Record in this account the cost of structures and improvements used in connection with electric transmission operations.

Account 352 captures the cost of buildings, vaults, tunnels, and other improvements that house or support transmission equipment. This includes transmission substations, switching station buildings, control houses, and similar structures. Only structures dedicated to transmission operations are recorded here; distribution substation buildings are recorded in Account 362.

What is typically included

• Transmission substation buildings and control houses
• Switching station structures and enclosures
• Vaults and tunnels for underground transmission equipment
• Foundations and structural supports for transmission equipment
• Fire protection, heating, ventilation, and similar building systems within transmission structures

What is generally not included

• Distribution substation structures (recorded in Account 362)
• Generation plant structures (recorded in generation accounts)
• General purpose office buildings not dedicated to transmission (Account 390)
• Land costs associated with transmission structures (Account 350)
• Transmission equipment housed within structures (Account 353)

Why this account matters

• Separates depreciable transmission structures from nondepreciable land (Account 350)
• Supports proper allocation of transmission costs in rate base calculations
• Provides basis for applying correct depreciation rates to transmission buildings
• Required for accurate FERC Form 1 transmission plant-in-service reporting
• Distinguishes transmission structures from distribution and general plant buildings