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Second-life battery
A second-life battery is a lithium-ion pack retired from electric-vehicle service, usually below 70% to 80% of original capacity, and reused in less demanding applications like grid and solar energy storage.
Secretariat of Energy (Mexico)
The Secretariat of Energy (Secretaría de Energía, SENER) is the Mexican federal ministry responsible for national energy policy, exercising the nation's rights over hydrocarbons and electricity.
Section 45Q
Section 45Q is a provision of the U.S. Internal Revenue Code providing a production tax credit for carbon oxides captured at industrial facilities, power plants, or from the air.
Section 45X tax credit
The Section 45X tax credit, formally the Advanced Manufacturing Production Credit, is a US federal tax credit for clean energy components and critical minerals produced in America.
Sectionalizer
A sectionalizer is an automatic switching device on medium-voltage distribution feeders that isolates faulted line sections by counting the interruption operations of an upstream recloser or breaker.
Sector coupling
Sector coupling, also called sector integration, is the interlinking of the electricity, heat, transport, and industry sectors so renewable electricity can replace fossil fuels and add flexibility.
Secunda CTL
Secunda CTL is a commercial coal-to-liquids facility operated by Sasol in South Africa. It converts low-grade coal and natural gas into liquid fuels, meeting about 28% of the country's annual needs.
Security-constrained unit commitment
Security-constrained unit commitment (SCUC) is the optimization problem of scheduling power generators, typically over 24 hours, at minimum cost while respecting transmission limits and credible outages.
SEFOR
SEFOR, the Southwest Experimental Fast Oxide Reactor, was a 20 MW experimental sodium-cooled fast reactor near Strickler, Arkansas, operated from 1969 to 1972 to measure the Doppler reactivity effect.
Sehit Aybuke Yalcin Oil Field
Sehit Aybuke Yalcin (Şehit Aybüke Yalçın) is an onshore oil field in Şırnak province, southeastern Türkiye, discovered by TPAO in 2023 with an estimated 1 billion barrels in place.
Sehit Esma Cevik Oil Field
Sehit Esma Cevik Oil Field (Şehit Esma Çevik Sahası) is an onshore oil field on Gabar Mountain in Şırnak, southeastern Türkiye, discovered by Turkish Petroleum (TPAO) in 2021.
Select Water Solutions
Select Water Solutions is an American water management and chemical company for the oil and gas industry, founded in 2008 and headquartered in Gainesville, Texas.
Selective emitter solar cell
A selective emitter solar cell is a crystalline silicon solar cell whose front emitter is doped non-uniformly: heavily under the metal contacts and lightly between them, improving efficiency.
Selective methanation
Selective methanation (SMET) is a catalytic process that removes trace carbon monoxide from hydrogen-rich reformate by converting it to methane, serving as the final purification step before fuel cells.
Selective non-catalytic reduction
Selective non-catalytic reduction (SNCR) is a flue gas treatment that injects ammonia or urea into combustion exhaust, reducing nitrogen oxides to nitrogen and water without a catalyst.
Self-assembled monolayer hole transport layers (MeO-2PACz)
MeO-2PACz is a self-assembled monolayer molecule used as a dopant-free hole transport layer in inverted perovskite solar cells, first reported in 2019 and now sold commercially.
Self-assembled monolayer hole-selective layer
A self-assembled monolayer hole-selective layer is a single-molecule-thick organic film, chemically anchored to a transparent electrode, that extracts holes in perovskite solar cells and has been standard since 2018.
Self-consumption
Self-consumption is the direct use of electricity generated on a consumer's own premises, usually rooftop solar, and it raises profitability because retail prices exceed prices paid for exports.
Self-healing battery binder
A self-healing battery binder is a polymeric adhesive in lithium-ion electrodes that repairs cycling damage, chiefly for silicon anodes, which swell about 300% in volume. The concept dates to 2013.
Self-healing battery electrode
A self-healing battery electrode is a battery electrode that repairs mechanical or electrochemical damage autonomously during operation, first demonstrated in 2013 at Stanford and SLAC.
Self-healing flexible energy storage
Self-healing flexible energy storage refers to flexible batteries and supercapacitors built from materials that repair cracks, punctures, and delamination, inspired by biological healing, for wearable and implantable devices.
Self-healing perovskite solar cell
A self-healing perovskite solar cell is a perovskite solar cell designed to recover from damage by light, heat, moisture, UV radiation, or mechanical stress, addressing perovskites' instability.
Self-healing solid electrolytes
Self-healing solid electrolytes are solid ion-conducting materials, mostly polymers or polymer–ceramic composites, that repair cracks and dendrite damage in solid-state batteries by reforming reversible chemical bonds.
Self-healing solid-state polymer electrolyte
A self-healing solid-state polymer electrolyte is a solid polymer that conducts lithium ions between battery electrodes and repairs cracks and electrode contact damage on its own.
Semakovskoye Gas Field
The Semakovskoye Gas Field (Семаковское) is a large natural gas field in northern Russia with over 320 billion m³ of reserves, produced from shore through extended-reach wells since 2022.
Sembcorp Industries
Sembcorp Industries is a Singapore-headquartered energy and urban solutions company, formed in 1998 from a merger, operating 28.5GW of renewables and gas capacity across 11 countries.
Semi-solid flow battery
A semi-solid flow battery (SSFB) is a flow battery that stores energy as particles suspended in a liquid electrolyte, first demonstrated at MIT in 2011.
Semi-transparent perovskite solar cell
A semi-transparent perovskite solar cell (ST-PSC) generates electricity from a metal halide perovskite absorber while transmitting visible light, serving solar windows, building-integrated photovoltaics, and tandem solar cells.
Seminole Electric Cooperative
Seminol Electric Cooperative is a not-for-profit generation and transmission electric cooperative headquartered in Tampa, Florida, serving nine member cooperatives that reach about 2 million people.
Seminole Generating Station
Seminole Generating Station is a coal-fired power station in Putnam County, Florida, operated by Seminole Electric Cooperative, with one 714 MW coal unit after Unit 1 retired in 2024.