Enables interchange of energy between systems resulting in a
lower total operating costs
lower total operating costs
•Enables systems to share operating reserve so that each system
can carry less spinning reserve
•Permits assistance from neighboring systems to cope with
unforeseen construction delays and unexpected load growth
•Results in requirement for lower installed capacity in each of the systems while still supplying the load with the same level of reliability
•Permits larger and more efficient generating units to be installedon the individual systems
•Permits emergency assistance between systems to mitigate the effects of unforeseen contingencies such as catastrophic multipleoutages
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