EP 1130-2-510
13 Dec 96
b. Available Hours. The hours during which a unit is available. Available Hours (AH) is
equal to the sum of Service Hours (SH) plus Reserve Standby Hours (RSH).
c. Balance of Total Investment Cost. The cumulative unpaid federal investment in power
facilities. The cost includes the additional federal investments subsequent to the initial placement
of generating units in service and the credits for the revenues transferred to the project.
d. Delayed Forced Outage Hours (DFOH). The hours for any malfunction that results in
removal of a generating unit from connection to the transmission system for maintenance or repair
at a later time, so as to allow an outage to be scheduled after the trouble develops.
e. Equipment Failures and Generation Interruptions. For the purpose of this guidance,
equipment failures and generation interruptions are defined as those affecting the project's major
power plant equipment which are necessary for generation of hydroelectric power. Such
equipment may consist of turbines, generators, transformers, switching equipment, station service
system, etc. Also included in this definition is loss of power generation due to project operating
procedures and errors, improper or faulty maintenance or work practices. Interruptions due to
lightning strikes, outages of non-USACE facilities, and those where impact to service, equipment,
cost, etc. is insignificant are excluded.
f. Forced Outage Hours (FOH). The hours for any failure, misoperation, or malfunction
that results in the immediate automatic or manual removal of a generating unit from connection to
the transmission system, or that prevents such connection from being accomplished when desired.
g. Generator Forced Outage (GFO). Any generating unit forced outage caused by a
misoperation, failure or malfunction of a turbine, water passage, governor, or generator, including
related auxiliaries or controls. These items are considered to represent a generating unit.
h. Generator Scheduled Outage (GSO). A scheduled outage for a generating unit. (See
1-4.g. above and Note 1 below.)
i. Hours. Hours will be recorded to the nearest hundredth.
j. In-Service Date. The in-service time and date reported in compliance with ER 1130-2-
510, Chapter 2, Reports on Hydroelectric Power Generation Statistics.
k. Non-Generator Forced Outage (NGFO). A forced outage caused by misoperation,
failure or malfunction of equipment or facilities beyond the load side of the generator terminals.
l. Non-Generator Scheduled Outage (NGSO). A scheduled outage for equipment other
than a generating unit. (See 4-4.l. above and Note 1 below.)
m. Period Hours (PH). The number of hours in the year for existing units. For new units,
the hours since the unit was first synchronized until the end of the year.
n. Planned Modification Hours (PMH). Scheduled outage for installation of new
equipment, switchyard rearrangements or to correct design or construction deficiencies.
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