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Energy tank method
The energy tank method is a passivity-based control technique that couples a virtual energy reservoir to a robot controller, keeping the closed loop passive during physical human-robot interaction.
Energy Transfer LP
Energy Transfer LP is a Dallas-based master limited partnership founded in 1996, operating about 140,000 miles of pipeline across 44 states and owning the Dakota Access Pipeline.
Energy transition
The energy transition is the global shift from fossil fuels toward low-carbon energy, combining renewable electricity, electrification, efficiency, hydrogen, and some continued fossil fuel use.
Energy Union
The Energy Union is a European Union strategy launched by the Commission in February 2015 under the Juncker Commission to give consumers secure, sustainable, and affordable energy.
Energy Vault
Energy Vault is an American energy storage company in California, best known for its EVx gravity system that stores electricity by lifting and lowering heavy blocks.
Energy-based identification
Energy-based identification is a method of estimating robot dynamic parameters by fitting an energy model, developed by Gautier and Khalil in the late 1980s and 1990s.
Energy-based model
An energy-based model is a probabilistic model that attaches a scalar energy to each configuration, converting energies to probabilities through the Boltzmann form without explicit normalization.
Energy-efficient train driving
Energy-efficient train driving, also called eco-driving or EETC, is the practice of driving a train along a speed trajectory that minimizes traction energy while still meeting the timetable's running time.
Energy-related Products Directive
The Energy-related Products Directive, Directive 2009/125/EC of 2009, is a European Union framework law letting the Commission set ecodesign requirements for energy-using products, repealed in 2024.
EnergyAustralia
EnergyAustralia is an Australian energy retailer and generator headquartered in Melbourne and wholly owned by Hong Kong-based CLP Group, serving more than 2.44 million electricity and gas customer accounts across five states and territories.
EnergySolutions Clive facility
The EnergySolutions Clive facility is a commercial disposal site for low-level radioactive waste near Clive, Utah, and one of four active commercial facilities in the United States.
Enerkem
Enerkem is a Montreal-based Canadian waste-to-biofuels company founded in 2000 by Esteban and Vincent Chornet, whose gasification process turns non-recyclable municipal waste into methanol and ethanol.
EnerSys
EnerSys is an American manufacturer of industrial batteries, chargers, and power equipment, headquartered in Reading, Pennsylvania, serving over 10,000 customers in more than 100 countries.
EnerVenue
EnerVenue Holdings, Ltd. is a Fremont, California energy storage company founded in 2020 by Stanford professor Yi Cui that makes NASA-derived nickel-hydrogen batteries for long-duration grid electricity storage.
EnEV
The Energieeinsparverordnung (EnEV) was Germany's statutory ordinance regulating building energy performance, in force from February 2002 until it was absorbed into the Buildings Energy Act (GEG) in 2020.
Eneva
Eneva is a Brazilian integrated energy company founded in 2001 as MPX by Eike Batista, now Brazil's largest private natural gas operator and largest thermal power generator.
Enexis
Enexis is a Dutch regional grid operator that builds and maintains electricity and gas networks serving three million customers in Groningen, Drenthe, Overijssel, Noord-Brabant, and Limburg.
Enfabrica
Enfabrica was a Silicon Valley networking-chip startup whose ACF SuperNIC fed data to AI accelerators; NVIDIA paid over $900 million for its CEO and technology in 2025.
Enflame
Enflame Technology is a Shanghai-based AI accelerator company founded in 2018 by former AMD engineers, backed by Tencent and listed on Shanghai's STAR Market in 2026.
Enformer
Enformer is a deep learning model from Google DeepMind and Calico, introduced in 2021, that predicts gene expression directly from DNA sequence using a transformer architecture.
Engerth locomotive
The Engerth locomotive was a supporting-tender steam design devised by Wilhelm Freiherr von Engerth for Austria's Semmering Railway, in which part of the tender's weight rested on the driving wheels.
Engie
Engie, formerly GDF SUEZ, is a French multinational utility headquartered near Paris that generates, transmits, and supplies electricity and gas in 30 countries, with more than 90,000 employees.
ENGIE Energía Perú
ENGIE Energía Perú is a Peruvian electricity generation and transmission company, one of Peru's largest private power producers with about 2,694 MW of installed capacity.
Engine
An engine is a machine that converts the chemical energy in a fuel into mechanical work, most often through internal combustion, which powers more than 250 million US vehicles.
Engine Alliance GP7000
The Engine Alliance GP7000 is a high-bypass turbofan developed by a 50/50 joint venture of General Electric and Pratt & Whitney to power the Airbus A380.
Engine configuration
Engine configuration in aviation is the arrangement of an engine's cylinders relative to its crankshaft, described as radial, in-line, V-type, or opposed, along with cooling method.
Engine control unit
An engine control unit (ECU), also called an engine control module, is the electronic controller that governs an internal combustion engine's fuel injection and ignition timing.
Engine department
The engine department, also called the engineering department, operates and maintains a ship's propulsion and support systems; one of three merchant-ship departments, it is headed by the chief engineer.
Engine displacement
Engine displacement, also called swept volume or engine capacity, is the total volume swept by all pistons in a piston engine, usually quoted in cc or liters.
Engine knocking
Engine knocking, also called pinging or spark knock, is abnormal combustion in spark-ignition engines where unburned fuel auto-ignites ahead of the flame front, producing a metallic pinging sound.