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: 02/16/2001

Offered MWh Scheduled MWh Percent
Bilateral Bids 6246 6246

Generation Bids 596310 416760 69.9%

Imports 63995 58083 90.8%
Exports 34370 30483 88.7%

Net Imports/(Exports) 29625 27600 93.2%
Wheel Throughs 20418 20068 98.3%