901 articles
South Carolina Public Service Authority
South Carolina Public Service Authority, commonly known as Santee Cooper, is a state-owned electric and water utility headquartered in Moncks Corner, South Carolina, created by the General Assembly in 1934.
Southern California Edison
Southern California Edison, also known as SoCal Edison or the Southern California Edison Company, is an investor-owned electric utility and Edison International subsidiary serving over 15 million Californians across roughly 50,000 square miles.
Southern Company
Southern Company is an Atlanta-based holding company, formed in 1947, whose vertically integrated electric utilities in the Southeast and natural gas businesses serve about 9 million customers nationwide.
Southwest Power Pool
Southwest Power Pool is a nonprofit regional transmission organization based in Little Rock, Arkansas, that runs the grid and wholesale power markets across all or part of 17 central and western states.
Southwestern Electric Power Company
Southwestern Electric Power Company, known as SWEPCO, is an American Electric Power utility headquartered in Shreveport, Louisiana, serving 556,100 customers in Louisiana, Texas, and Arkansas since 1912.
Southwestern Public Service Company
Southwestern Public Service Company is a vertically integrated electric utility serving the Texas Panhandle and eastern New Mexico, headquartered in Amarillo, Texas, as a wholly owned subsidiary of Xcel Energy.
SP Group (Singapore)
SP Group, formally Singapore Power, is a Singapore utilities company, wholly owned by Temasek Holdings, that owns and operates Singapore's electricity and gas networks, serving about 1.7 million customers.
Special protection scheme
A special protection scheme (SPS), also known as a remedial action scheme (RAS) or system integrity protection scheme (SIPS), detects abnormal grid conditions and takes corrective actions such as tripping generators or shedding load.
Spinning reserve
Spinning reserve is the portion of operating reserve from generators already synchronized to the grid and running below full output, able to increase production within about 10 minutes.
Split-phase electric power
Split-phase electric power is a single-phase AC distribution arrangement in which a center-tapped transformer winding delivers 120/240 VAC over three wires, the standard residential supply in North America.
sPower
sPower (FTP Power LLC) is an American independent power producer owning utility-scale solar and wind assets, headquartered in Salt Lake City and acquired by AES and AIMCo in 2017.
Stanwell Corporation
Stanwell Corporation is a Queensland Government Owned Corporation that generates, trades, and retails electricity. Established in 1997, it operates coal-fired power stations at Rockhampton and the South Burnett.
State Grid Corporation of China (国家电网公司)
State Grid Corporation of China (国家电网公司) is the state-owned enterprise that builds and operates most of China's electric power grid. Founded in 2002, it serves over 1.1 billion people across 26 provinces.
Static synchronous compensator
A static synchronous compensator, also written static synchronous condenser, is a shunt FACTS device that supplies or absorbs reactive power on an AC grid to regulate voltage.
Static synchronous series compensator
The static synchronous series compensator (SSSC) is a converter-based FACTS device that injects a controllable voltage in quadrature with line current, controlling power flow like a series capacitor or reactor.
Static VAR compensator
A static VAR compensator (SVC) is a shunt-connected power-electronic device regulating voltage on AC networks through thyristor-controlled reactive compensation, a standard FACTS controller first applied commercially in 1964.
Station post insulator
A station post insulator is a rigid insulator used in high-voltage substations to support bus bars, conductors, and disconnect switches, made in porcelain, composite, and toughened glass.
Station service transformer
A station service transformer (SST), also called a station auxiliary transformer, supplies a power plant's own auxiliary loads from the high-voltage transmission network, independent of generator status.
Statnett
Statnett is the state-owned transmission system operator of the Norwegian power system, founded in 1992 and responsible for the central grid, balancing supply and demand, and the electricity market.
Stedin
Stedin is a Dutch distribution system operator that owns and runs the regional electricity and gas grids for about 5.6 million people in South Holland, Utrecht, and Zeeland.
Step-voltage regulator
A step-voltage regulator (SVR) is a tap-changing autotransformer installed on medium-voltage distribution lines that adjusts voltage in 32 steps, boosting or bucking it up to 10%.
Stockbridge damper
A Stockbridge damper is a dumbbell-shaped tuned mass damper with two masses on a short steel cable, clamped to overhead conductors to dissipate wind-induced vibration, patented in the 1920s.
Stray voltage
Stray voltage is a small voltage between two surfaces an animal touches at once, such as a water trough and barn floor, giving dairy cows a mild shock.
Stress grading
Stress grading, also called field grading or electric field grading, controls the electric field distribution within or around a high-voltage device, most commonly in the terminations and joints of power cables.
Submarine power cable
A submarine power cable is an insulated cable laid on or buried in the seabed to transmit power across water, first installed in Germany in 1811.
Substation
A substation is a node in the electrical grid where voltage is transformed between levels and circuits are switched, connecting generation, transmission, and distribution; the US grid has over 55,000 transmission substations.
Substation automation
Substation automation applies microprocessor-based intelligent electronic devices, communication networks, and software to monitor, control, and protect power substation equipment, replacing electromechanical relays and governed by the IEC 61850 standard.
Subsynchronous resonance
Subsynchronous resonance (SSR) is a power system condition where a series-compensated transmission line exchanges energy with a generator below rated frequency, potentially damaging the shaft.
SuedLink
SuedLink is a pair of high-voltage direct-current underground transmission lines under construction in Germany, carrying wind power about 1,200 kilometers from Schleswig-Holstein to Bavaria and Baden-Württemberg with 4 gigawatts of capacity.
Superconducting cable
A superconducting cable is a power transmission cable whose superconducting conductor, cooled below its critical temperature, conducts with essentially zero resistance, carrying up to seven times the power of a conventional cable.