Energy technology

SolarWorld

SolarWorld AG was a German photovoltaic manufacturer headquartered in Bonn, founded in 1998, that led trade complaints against Chinese panel imports and filed for insolvency in 2017.

Solatio Energia is a Spanish developer and investor in large-scale photovoltaic power plants that has operated in Brazil since around 2009, with over 20 GWp of projects developed and a green hydrogen venture in Piauí.

Sole gas field

The Sole gas field is a producing natural gas field in the eastern Gippsland Basin off Victoria, Australia, supplying gas to the domestic east coast market.

Solenoid-free plasma startup

Solenoid-free plasma startup is starting and ramping up tokamak plasma current without the central solenoid, a key goal for compact spherical tokamaks with little central space.

SolFocus (company)

SolFocus, Inc. was a concentrating photovoltaic startup founded in 2006 and based in Mountain View, California, which deployed about 18 megawatts of solar projects before winding up in 2013.

Solid electrolyte

A solid-state electrolyte is a solid material, typically a ceramic, glass-ceramic, polymer, or composite, that conducts lithium, sodium, or potassium ions between a battery's electrodes while suppressing electronic conduction.

Solid electrolyte interphase

The solid electrolyte interphase (SEI) is a nanoscale passivation layer on lithium batteries' negative electrode that conducts ions but blocks electrons, forming mainly during the first charge.

Solid electrolyte interphase engineering

Solid electrolyte interphase (SEI) engineering is the deliberate design of the film that forms on a battery anode from electrolyte decomposition, aiming for stable, lithium-metal cells.

Solid oxide electrolysis cell

A solid oxide electrolysis cell (SOEC) is an electrochemical device that splits steam, and optionally carbon dioxide, into hydrogen at high temperature, reaching efficiencies up to 84%.

Solid oxide fuel cell

A solid oxide fuel cell (SOFC) is an electrochemical device that converts fuels like hydrogen or natural gas directly into electricity using a hot ceramic electrolyte.

Solid particle thermal storage

Solid particle thermal storage heats sand-like ceramic or silica particles above 1000 °C and holds them until the heat drives a power cycle or supplies industrial heat.

Solid polymer electrolyte battery

A solid polymer electrolyte battery is a rechargeable battery in which a solid polymer-salt complex, typically PEO with a lithium salt, replaces the liquid electrolyte as ion conductor and separator.

Solid Power

Solid Power Inc. is a Colorado-based battery developer, founded in 2011 as a University of Colorado Boulder spinout, that makes sulfide-based all-solid-state cells and electrolytes for electric vehicles.

Solid-electrolyte CO2 electrolysis

Solid-electrolyte CO2 electrolysis covers two approaches using a solid ion conductor: high-temperature solid oxide cells making CO or syngas, and low-temperature reactors making pure formic acid.

Solid-state battery

A solid-state battery, also called a solid battery, is a rechargeable battery in which a solid electrolyte replaces the flammable liquid of lithium-ion cells, enabling lithium-metal anodes.

Solid-state circuit breaker

A solid-state circuit breaker is an electrical protection device that interrupts fault current with power semiconductor switches in microseconds, aimed mainly at fast-rising DC fault currents.

Solid-state composite cathode

A solid-state composite cathode is the positive electrode of an all-solid-state battery, a solid mix of active material, solid electrolyte, carbon, and binder that must conduct ions and electrons.

Solid-state sodium battery

A solid-state sodium battery is a rechargeable battery in which a solid electrolyte replaces the flammable liquid between electrodes, offering sodium's low cost, improved safety, and higher energy density.

Solid-state transformer

A solid-state transformer (SST) is a power electronics-based device that converts voltage with semiconductor converters and a compact medium-frequency transformer, adding functions like fault current limiting and bidirectional power flow control.

Sep 29, 2026

Solid-state Z-scheme

The solid-state Z-scheme is a photocatalysis design joining two semiconductors through a solid electron mediator, first reported in 2006 for water splitting and CO2 conversion.

Solntsevsky Coal Mine

The Solntsevsky Coal Mine (Солнцевский угольный разрез) is an open-pit brown coal mine in southwestern Sakhalin, Russia, and the largest coal operation of the East Mining Company.

Soltec

Soltec is a Spanish manufacturer of solar trackers, the motorized structures that rotate photovoltaic panels to follow the sun, founded in 2004 and headquartered in Molina de Segura, Murcia.

Soluble boron

Soluble boron, called chemical shim or a soluble poison, is boric acid dissolved in a pressurized water reactor's coolant to absorb neutrons and control core reactivity, reducing reliance on control rods.

Solution processing of perovskite solar cells

Solution processing of perovskite solar cells is the fabrication of perovskite films by depositing dissolved precursors and crystallizing them at low temperature, enabling printing and roll-to-roll production.

SOLV Energy

SOLV Energy is a San Diego-based company providing engineering, procurement, and construction and operations services for utility-scale solar and battery storage projects across the United States.

Solveig field

Solveig is an oil field in the Norwegian sector of the North Sea on the Utsira High, discovered in 2013, producing since 2021, and operated by Aker BP.

Solvent dewaxing

Solvent dewaxing is a petroleum refining process that removes wax from lubricating oil stocks by solvent dilution, chilling, and filtration, giving the oil low-temperature fluidity and yielding slack wax.

Solvent engineering for perovskite films

Solvent engineering for perovskite films controls how thin films crystallize by choosing solvents and an antisolvent, such as toluene, during spin coating; it underpins most high-efficiency perovskite solar cells.

Solvent Refined Coal process

The Solvent Refined Coal (SRC) process is a US direct coal liquefaction method, developed from the 1960s to the 1980s, yielding a low-sulfur, low-ash fuel.