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A power transaction specifies a way in which the system load and/or generation changes according to a set of rules. In our software, a power transaction is specified using the source/sink concept, and flexible load/generation scaling and scheduling options are provided to define dispatches for the source/sink.
 
The power transfer limits determined can be subject to any or all of the following security criteria:
 
,	Thermal overloadDownload,	Steady-state voltage violations
 ,	Transient voltage violations
 ,	Transient frequency violations
 ,	Voltage stability margin
 ,	Active and reactive power reserve
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