About GAA Unit Capacity

GAA Unit records contain four fields that define the capacity of the unit:

Nameplate Gross Dependable Capacity
Nameplate Gross Maximum Capacity
Nameplate Net Dependable Capacity
Nameplate Net Maximum Capacity

The above fields define the default capacity of a GAA Unit. This capacity is the intended full-load sustained output of a GAA Unit under conditions described by the OEM. The actual capacity for a GAA Unit, however, may vary because of the several reasons:

Actual conditions may not match the design conditions, such as environment, fuel, etc.
The unit is operating at reduced output for part of the time due to equipment failures or routine maintenance.
Fuel quality may be different from original recommendation
May include restrictions or limitations on air permits and limitations on transmission that force the unit to produce reduced output.

Also, the actual capacity typically decreases over a period of time, because of wear and tear of the equipment and other reasons described above.

In GAA, you can define different capacities for different periods of time. By default, when you add a GAA Unit record, a GAA Unit Capacity record is automatically created with the values defined in the capacity related fields in the GAA Unit record. You can modify this record or add new records. When you create a Performance record for a month for the first time, the values defined in the GAA Unit Capacity record are used. After you save the Performance record, you can continue to use the same values or modify them, as needed.