Letter: S

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Substation

A facility that receives power from a plant and then uses equipment to switch, change, or regulate voltage for transmission across long distances and final distribution to homes and businesses.

Southwest Power Pool (SPP)

A Regional Transmission Organization (RTO) responsible for managing the power grid and wholesale electricity market across all or part of 14 US states, including Kansas, Oklahoma, New Mexico, Texas, Arkansas, Louisiana, Missouri, South Dakota, North Dakota, Montana, Minnesota, Iowa, Wyoming, and Nebraska.

Selective catalytic reduction (SCR)

An emissions control technology that significantly reduces nitrogen oxides (NO2) from exhaust into nitrogen (N2) and water (H2O).

Supervisory Control Data Acquisition (SCADA)

A system of hardware and software that enables organizations to manage, monitor, and control processes by interfacing with plant-floor machines and viewing real-time data.

Substantial completion

A milestone in construction projects when a power plant is ready for commercial operations with minor work remaining.

Service bulletin

An official notice from a manufacturer about known issues and repairs for specific aeroderivative engines and components.
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