These transactions are scheduled directly between a generator and a load, that is, bilateral - between two parties. All bilateral bids offered within NY are also automatically scheduled by NYISO.   This is energy brought into New York from neighboring control areas, which include PJM Interconnection, ISO New England, Hydro Quebec and IMO (Ontario). The amount scheduled is determined by price, thus not all that is bid gets scheduled. Energy flowing out of New York to the neighboring control areas. Again price determines how much energy is actually scheduled for export. This is the sum of energy imports less exports. Wheel throughs have no impact on this calculation as their flow in and out nets to zero. The amount of energy purchased in one control area and delivered to another control area, that is, just wheeling through New York. All generating units in New York must submit bids in order to be considered by NYISO. Units are scheduled based on economics and the need to maintain reliable system operation.    
Balancing Market Advisory Summary
Date: 06/17/2001

Offered MWh Scheduled MWh Percent
Bilateral Bids 1392 1392

Generation Bids 537372 391682 72.9%

Imports 47445 43847 92.4%
Exports 8827 8827 100.0%

Net Imports/(Exports) 38618 35020 90.7%
Wheel Throughs 7100 7100 100.0%