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.  This is a summary of gross imports, gross exports and net imports displayed by external control area.
Balancing Market Advisory Summary
Date: 12/10/2007

Offered MWh Scheduled MWh Percent
Bilateral Bids 20290 20290

Generation Bids 598789 420864 70.3%

Imports 104624 103527 99.0%
Exports 51267 48189 94.0%

Net Imports/(Exports) 53357 55338 103.7%
Gross Imports/Exports Summary
Wheel Throughs 4702 4273 90.9%