All articles starting with E
17,681 articles
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 filtering (electron microscopy)
Energy filtering, known as energy-filtered TEM (EFTEM), is a transmission electron microscopy technique that removes inelastically scattered electrons or uses them to form elemental maps.
Energy flow (ecology)
Energy flow (ecology): one-way transfer of solar energy through trophic levels, from producers to consumers and decomposers. Key figures: Lindeman's 1942 trophic-dynamic concept, the 10% rule, and measured mean transfer efficiency of 5.92%.
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 France
Energy in France is dominated by nuclear power, which supplies about two thirds of its electricity and 41% of primary energy, reaching 95% low-carbon generation in 2024.
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 Italy
Energy in Italy is characterized by heavy import dependency, with over 74% of net energy consumed imported and 92% of fossil fuel supplies covered by imports.
Energy in Japan
Energy in Japan describes how the country supplies its power and fuels, importing most of them, with fossil fuels at 88% of supply in 2019.
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 Information Administration
The U.S. Energy Information Administration (EIA), established in 1977, is the independent statistical agency of the Department of Energy, collecting and publishing energy data for the public.
Energy Innovation Capital
Energy Innovation Capital is an American venture capital firm, founded in 2016 and headquartered in Orinda, California, that invests in next-generation energy technology companies across the United States.
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 Intake
Energy intake (EI): energy consumed in food and drink, in kcal or MJ/day. Measured by self-report (recalls, records, FFQs) and validated against doubly labeled water; self-reports under-report by roughly 1–47%.
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 Land
Energy Land (白浜エネルギーランド, Shirahama Energy Land) is an experiential theme park in Shirahama, Wakayama Prefecture, Japan. Opened in 1981, it teaches energy through gravity and optical illusions.
Energy level
An energy level, also called an energy state, is one of the allowed values of the total energy of a quantum system such as an atom or molecule.
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 medicine
Energy medicine: complementary practices based on an invisible biofield or vital energy, including Reiki, Therapeutic Touch, and Healing Touch; unvalidated premise, mixed clinical evidence, strongest signal for pain reduction.
Energy method
The energy method is a technique in the analysis of partial differential equations in which an estimate for a nonnegative quantity, called an energy, is derived from the equation itself.
Energy minimization
Energy minimization, also called geometry optimization, is the computational search for a local minimum of potential energy on a potential energy surface, using algorithms such as L-BFGS.
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 Plant Collection
Energy Plant Collection (能源植物园) is a living collection at Xishuangbanna Tropical Botanical Garden, CAS, built in 2010 on about 85 mu, holding 360+ energy plant species in 52 families across six biomass-type zones including fuelwood, starch, fiber, oil, and hydrocarbon plants.