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Tariff

The schedule of rates, terms and conditions that a utility submits to a state's public utilities commission for regulatory approval

Tieline

A transmission line that connects two control areas or regions

Time of Use

Charging customers for electric usage, based on the bloc of time (generally on-peak, mid-peak or off-peak) it is consumed

Transco

An investor-owned, for-profit entity that combines the operation and ownership of transmission assets

Transmission

Moving electrical energy from a generating source across a high voltage grid to an interconnection or a point of use within a utility system

Transmission Loading Relief (TLR)

When a transmission operator must curtail transmission to prevent the grid from collapse

Transmission Reliability Margin

The transmission transfer capability that is required to ensure that interconnections are secure under a reasonable range of system conditions

Unbundling

Separating (spinning off) the generation, transmission, distribution and customer service functions of an electric utility; separating a customer's bill into its individual components

Unit Commitment

Determining the generators that must be operated to meet daily demand

Universal Service

Electric service sufficient for basic needs that is available to all members of the population regardless of income

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