Load Duration Curve (LDC)<span class=" width="600" />

Load Duration Curve (LDC)

A non-chronological, graphical summary of demand levels with corresponding time durations using a curve, which plots demand magnitude (power) on one axis and percent of time that the magnitude occurs on the other axis.

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Load Factor (LF)<span class=" width="600" />

Load Factor (LF)

In context of electricity, the “load factor” refers to the percentage of electricity needed, used or produced over a period of time, relative to the peak (maximum) electric demand or capacity over the same period of time.

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Electric Regulation<span class=" width="600" />

Electric Regulation

The capability of a generating unit to automatically respond to the CAISO’s four-second automatic generation control signal to adjust its output as may be needed to maintain system frequency  and reduce risks of outages. [Source: California Independent System Operator (CAISO), 2013 Flexible Capacity Procurement Requirements,…

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Flexible Capacity (aka 
Flexible Capacity and Local Reliability Resource Retention)<span class=" width="600" />

Flexible Capacity (aka 
Flexible Capacity and Local Reliability Resource Retention)

A tariff mechanism developed by the CAISO to provide supplemental compensation to designated generation assets that are deemed essential to statewide electric reliability. The Flexible Capacity and Local Reliability Resource Retention (FLRR) was designed as a stop-gap measure, enabling uneconomic generation units that would otherwise…

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Demand Response (DR)<span class=" width="600" />

Demand Response (DR)

Reduction of electricity usage by customers within a given time period, or shifting that usage to another time period in response to a price signal, a financial incentive, an environmental condition, or a reliability signal.  [Source: CPUC website: http://www.cpuc.ca.gov/PUC/energy/Demand+Response/]

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Renewables Integration<span class=" width="600" />

Renewables Integration

Deploying and operating enough flexible, controllable resources to ensure grid reliability given the variability and uncertainty associated with intermittent renewable power generation. [Source: California Energy Commission (CEC) Website: http://www.cpuc.ca.gov/PUC/energy/Renewables/hot/Renewable+Integration.htm]

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Ramp Time<span class=" width="600" />

Ramp Time

The amount of time for a generation unit to reach a targeted level of production capacity.

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Permanent Load Shifting (PLS)<span class=" width="600" />

Permanent Load Shifting (PLS)

The ability to shift the timing of electric demand.

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Load Following<span class=" width="600" />

Load Following

The ramping capability of a resource to match the maximum megawatts by which the net load is expected to change in either an upward or a downward direction within a certain timeframe. [Source: California Independent System Operator, 2013 Flexible Capacity Procurement Requirements, p.4.]

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Electric System Losses<span class=" width="600" />

Electric System Losses

Total electric energy losses in the electric system, comprised of transmission, transformation, and distribution losses between supply sources and delivery points. [Source: The Potential Benefits of Distributed Generation and Rate-Related Issues That May Impede Their Expansion, U.S. Department of Energy, February 2007, p.xvii]

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