61,984 articles
Energy Dome
Energy Dome is an Italian long-duration energy storage company founded in Milan in 2020, known for its CO2 Battery, which stores electricity by compressing carbon dioxide into a liquid.
Energy efficiency design index
The energy efficiency design index is a mandatory International Maritime Organization measure under MARPOL Annex VI that limits new ships' CO2 emissions per tonne-mile, in force since 2013.
Energy Efficiency Directive
The Energy Efficiency Directive is the European Union's framework law setting binding targets for reducing energy consumption, recast in 2023 under the Fit for 55 package.
Energy Efficiency First Principle
The Energy Efficiency First principle (EE1st) is a rule of European Union energy policy requiring cost-efficient efficiency measures to be considered as alternatives to new supply infrastructure.
Energy Harbor
Energy Harbor Corp. was an independent, privately held energy producer and retailer headquartered in Akron, Ohio, created in 2020 when FirstEnergy Solutions emerged from bankruptcy; Vistra acquired it in 2024.
Energy harvesting
Energy harvesting, also called energy scavenging, converts ambient mechanical, thermal, and radiative energy into usable electrical power, letting wireless sensors, wearables, and biomedical implants run without batteries.
Energy in Germany
Energy in Germany is supplied by a system in transition: it imports 67 percent of its energy, and renewables generated a record 54.4 percent of electricity in 2024.
Energy in the United Kingdom
Energy in the United Kingdom covers the production, import, conversion, and consumption of energy across electricity, gas, oil, and renewable systems, guided by the Clean Power 2030 target.
Energy in the United States
Energy in the United States, also called energy use in the US, comes mainly from petroleum and natural gas; 2024 production hit a record 103.3 quads.
Energy industry
The energy industry, also called the energy sector, is the economic sector that produces fossil fuels, generates and delivers electricity, and builds renewable energy equipment, and it is the largest source of global greenhouse gas emissions.
Energy Institute
The Energy Institute is a British chartered professional membership body for people across the whole energy sector, incorporated by Royal Charter in 2003 and counting more than 20,000 members worldwide.
Energy intensity
Energy intensity is the energy used per unit of economic output, measured as total energy supply divided by GDP, and the official indicator for SDG target 7.3.
Energy management (aeronautics)
Energy management in aeronautics is the planning and control of airspeed, altitude, thrust, drag, and trajectory to meet flightpath targets. Poor energy management contributes to the most common fatal aviation accidents.
Energy Market Regulatory Authority (Turkey)
The Energy Market Regulatory Authority (EMRA; Turkish: Enerji Piyasası Düzenleme Kurumu, EPDK) is Turkey's independent energy regulator, handling licensing and tariffs for electricity, natural gas, petroleum, and LPG markets.
Energy Northwest
Energy Northwest, formerly the Washington Public Power Supply System, is a Washington joint operating agency formed in 1957 that generates carbon-free electricity at cost for member utilities.
Energy Performance Certificate
An Energy Performance Certificate rates a building's energy efficiency on an A to G scale and recommends improvements, required when buildings are sold or rented across Europe.
Energy Performance Contracting
Energy performance contracting (EPC) is a service contract in which an energy service company guarantees specified energy savings, letting clients pay for improvements from the savings.
Energy Performance of Buildings Directive
The Energy Performance of Buildings Directive (EPBD) is the European Union's main law on building energy performance, first adopted in 2002 and requiring all new buildings to be zero-emission from 2030.
Energy Policy Act of 2005
The Energy Policy Act of 2005 is a United States federal law, signed by President George W. Bush on August 8, 2005, setting policy on energy production, efficiency, and electricity regulation.
Energy Policy and Conservation Act
The Energy Policy and Conservation Act (EPCA) is a 1975 United States federal law that created the Strategic Petroleum Reserve and CAFE fuel economy standards.
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.