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Electricity

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Single-phase service

Single-phase is a service configuration offered by electric utilities and is typically provided to residential and small commercial...

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Small modular reactor (SMR)

Most existing nuclear reactors are big – typically ranging in size from 600 to more than 1,500 MW. New technologies in development...

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Smart grid

The term smart grid (also sometimes called the advanced grid) applies to deployment of various digital technologies at points throughout...

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Smart inverter

A smart inverter is an inverter that includes sophisticated power electronics that allow it to provide a variety of functions while...

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Smart meter

An advanced solid-state meter that includes remote communication of data is often called a smart meter. A smart meter offers the ability...

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Southwest Power Pool (SPP)

SPP is a regional transmission organization (RTO) that coordinates dispatch and transmission of wholesale electricity in parts of 14...

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Spark spread

The spark spread is a quantity that represents the difference between the wholesale market price of electricity and the cost of producing...

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Speculation

Speculation is the act of taking on risk with the goal of making money. To understand the use of financial instruments, you must clearly...

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Spinning reserve

Spinning reserve is provided by resources that are not putting energy onto the grid but are synchronized to the frequency of the system...

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Spot market

In the energy business, a spot market is a commodities market in which the commodity is sold for cash and is delivered to a specific...

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State estimator

A state estimator is a software program that describes the current state of an electrical transmission or distribution system. The...

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Steam turbine

Steam turbines create electricity in four key steps. First, a fuel is combusted to create heat energy. The heat is used to convert water...

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Stranded costs

A stranded cost refers to the amount invested in an asset that exceeds the market value of that asset. Stranded costs often arise during...

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Sub-meter

Sub-meters are meters installed behind a master meter. Master and sub-metering is common in tenant occupancies like office buildings,...

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Substation

Substations are sets of equipment on an electrical system that transform voltage from high to low, or vice versa, and may perform other...

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Supply-side competition

Supply-side competition refers to competition between providers of a commodity. In natural gas markets it refers to competition between...

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Surge impedance loading (SIL)

Surge impedance loading, commonly called SIL, is a quantity used by system operators as a benchmark to determine whether a transmission...

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Switching

Switching is the process of rerouting the path that power takes through an electric transmission or distribution system by opening or...

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Switchyard

A switchyard is the set of facilities outside a power plant in which voltage is transformed and electricity flow is directed onto...

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Synchronization

A synchronous generator is an electrical machine that converts the mechanical power of a spinning shaft into alternating current (AC)...

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