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House Load of a Power Plant is also known as Auxiliary Power Consumption or Units Used on Works.

It is the electrical power needed to drive the pumps and fans that support the operation of the power plant.

Typically the power plant metering is set up to measure the electricity produced by the generator at the terminals. A seperate meter will measure the electricity used by the auxiliaries, at the unit transformer.

Auxiliary Power Consumption is often expressed as a percentage of Units Generated, so:

Aux Power = ( Units Used on Works / Units Generated ) x 100 %

% MWh MWh

Typical Auxiliary Power Consumption depends on the type of plant:

Plant Type

%

Coal-fired Thermal

6.5 - 8.0

Open Cycle Gas Turbine

2.5 - 3.5

Combined Cycle Gas Turbine

1.0 - 1.5

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