Imbalance energyDiscrepancy between the amount that a seller contracted to deliver and the actual volume of power delivered.
Independent System Operator (ISO)An independent, Federally regulated entity established to coordinate regional transmission in a non-discriminatory manner and ensure the safety and…
IndexStatistical measure of the state of the stock market or economy based on the performance of stocks or other components.
Injection seasonThe period from April 1 through October 31, during which gas is injected into natural gas storage reservoirs in preparation for withdrawal and use during…
Installed capacityThe total capacity of electrical generation devices in a power station or system.
IntercontinentalExchange (ICE)An exempt exchange under CFMA 2000. It is exempt from many reporting requirements that are required of Nymex.
Interruptible or nonfirm transportationTransmission service that is reserved and scheduled on an as–available basis and is subject to curtailment or interruption.
IntertieThe point of physical interconnection between adjacent transmission systems.