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    Hedging Contract

    A financial instrument that establishes the future prices and quantities of electricity independently of the short-term market, e.g., contracts for differences, forwards, futures, and option contracts

    Hourly Market

    The market in which blocs of energy are traded on an hourly basis

    Hub

    A transmission network location where the price of electricity is used by traders as a reference price for spot transactions and for contracting

    Incremental Load

    The portion of a generator's load that is in addition to its existing load

    ISO (Independent System Operator)

    A for-profit or non-profit entity established under FERC Order 888 and independent of market participants, that maintains generation-load balance through real-time monitoring and controlling of the transmission system and some generating units

    Interchange

    Electric power or energy that flows from one entity to another

    Interconnected System

    A system consisting of two or more individual electric systems that operates synchroniously and have connecting tielines

    Interconnection

    A facility that connects two transmission systems or control areas, or that connects a non-utility generator to a system or control area; (when capitalized, it refers to the North American Eastern, Western, ERCOT or Alaska electric systems)

    Interface

    The specific set of transmission elements between two areas that comprise one or more electrical systems

    Interruptible Rate

    The lower rate offered to a customer (generally a large industrial or commercial entity) who agrees to have electric service interrupted, usually during a high demand period

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