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Energy policy of India
India's energy policy governs how India's central and state governments manage energy production, pricing, and decarbonization, pursuing 500 GW of non-fossil capacity by 2030 and net zero by 2070.
Energy policy of the European Union
The energy policy of the European Union is the body of EU law and funding combining an internal energy market with decarbonisation, under a shared competence since 1951.
Energy price cap
The energy price cap is a maximum on unit rates and standing charges that Ofgem sets for domestic energy tariffs in Great Britain, in force since January 2019.
Energy recovery ventilator
An energy recovery ventilator (ERV) is a balanced mechanical ventilation device that supplies fresh air to a building while transferring heat and moisture between air streams.
Energy security
Energy security is the ability of a country to ensure uninterrupted energy availability at affordable prices, a concept originating in oil policy after the 1973 oil embargo.
Energy Security Strategy (Australia)
Australia's Energy Security Strategy is the set of Commonwealth laws, market rules, and reserves keeping liquid fuel, electricity, and gas available through disruptions and the transition to net zero.
Energy Star
Energy Star, also known as the Energy Star rating, is a voluntary US government labeling program launched by the EPA in 1992 that identifies energy-efficient products, homes, and buildings.
Energy storage
Energy storage, also called electricity storage, holds energy for later use, led worldwide in 2025 by lithium-ion batteries at 56% of capacity and pumped hydro at 43%.
Energy Storage Grand Challenge
The Energy Storage Grand Challenge (ESGC) is a US Department of Energy program announced in January 2020 to coordinate energy storage research, development, commercialization, and manufacturing.
Energy subsidy
An energy subsidy is any government action lowering energy costs, from direct cash payments to tax breaks and uncharged environmental damage; estimates range into the trillions of dollars.
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-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.
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 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.
Engine-generator
An engine-generator, or genset, is a generating set in which an internal combustion engine drives an AC generator to convert fuel into electrical power, from small residential units to large standby diesels.
Engineered barrier system
An engineered barrier system is the set of engineered materials in a geological repository, including canisters, buffer, and backfill, that isolates radioactive waste from the biosphere.
Engineering Recommendation G99
Engineering Recommendation G99, also known as EREC G99, is an Energy Networks Association standard governing connections of solar, wind, and battery generation to Great Britain's distribution networks.
Engro Elengy FSRU
The Engro Elengy FSRU is the floating storage and regasification vessel Exquisite at Pakistan's first LNG import terminal, at Port Qasim, operational since March 2015.