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Topics referred to by the same term
Energy efficiency may refer to: Energy efficiency (physics), the ratio between the useful output and input of an energy conversion process Electrical
Energy_efficiency
Discussing what form of transport is the most fuel efficient and economical
The energy efficiency in transport is the useful travelled distance, of passengers, goods or any type of load; divided by the total energy put into the
Energy efficiency in transport
Energy_efficiency_in_transport
Methods for higher energy efficiency
Efficient energy use, or energy efficiency, is the process of reducing the amount of energy required to provide products and services. There are many
Efficient_energy_use
Ratio between the useful output and the input of a machine
Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well
Energy_conversion_efficiency
Ratio of energy extracted from sunlight in solar cells
Solar-cell efficiency is the portion of energy in sunlight that is converted into electricity by a solar cell. Efficiency, in combination with latitude
Solar-cell_efficiency
Energy consumption labelling scheme
Energy Label clearly displayed when offered for sale or rent. The energy efficiency of the appliance is rated in terms of a set of energy efficiency classes
European_Union_energy_label
Vehicle propelled fully or mostly by electricity
intermediate mechanical step, the energy conversion efficiency can be improved compared to hybrids by avoiding unnecessary energy conversions. Furthermore, electro-chemical
Electric_vehicle
Performance measure of a device that uses thermal energy
the thermal efficiency ( η t h {\displaystyle \eta _{\rm {th}}} ) is a dimensionless performance measure of a device that uses thermal energy, such as an
Thermal_efficiency
Assembly of photovoltaic cells used to generate electricity
microinverter. Solar-cell efficiency is the portion of energy in sunlight that is converted into electricity by a solar cell. Efficiency, in combination with
Solar_panel
Indian government agency
The Bureau of Energy Efficiency is an agency of the Government of India, under the Ministry of Power, created in March 2002 under the provisions of the
Bureau_of_Energy_Efficiency
Appliance for cold food storage
mandatory energy efficiency rating label, with A being the most efficient, instead of the Energy Star. For US refrigerators, the Consortium on Energy Efficiency
Refrigerator
Technology of indoor and vehicular environmental comfort
filtration, and humidity control. HVAC design considerations include energy efficiency, indoor air quality, maintenance, and environmental impact, particularly
Heating, ventilation, and air conditioning
Heating,_ventilation,_and_air_conditioning
Efficiency leads to increased demand
rebound effects from improved energy efficiency. In addition to reducing the amount needed for a given use, improved efficiency also lowers the relative cost
Jevons_paradox
Cooling output divided by electricity input, as a standard for HVAC systems
In the United States, the efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER) which is defined by the Air Conditioning
Seasonal energy efficiency ratio
Seasonal_energy_efficiency_ratio
Form of thermal efficiency
that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may vary per device, which in
Fuel_efficiency
reporting requirements, energy-efficiency standards, and broader transparency measures for AI-related resource use. AI-related energy use arises at multiple
Environmental_impact_of_AI
CRC Energy Efficiency Scheme, the Energy Savings Opportunity Scheme, and Climate Change Agreements. In tackling the energy trilemma, saving energy is the
Energy_in_the_United_Kingdom
Engine in which fuel combusts with an oxidizer
superheat water steam to run a steam turbine. Thus, the efficiency is higher because more energy is extracted from the fuel than what could be extracted
Internal_combustion_engine
Facility used to house computer servers
energy consumption, but this share fell sharply to about 10% by 2023 as workloads migrated to hyperscale and colocation facilities. Energy efficiency
Data_center
Form of electric spacecraft propulsion
overall efficiency drops because ionization takes up a larger percentage energy and at the high end propulsive efficiency is reduced. Optimal efficiencies and
Ion_thruster
Aircraft engine that produces thrust by emitting a jet of gas
turbojets, energy efficiency and propellant (fuel) efficiency are much the same thing, since the propellant is a fuel and the source of energy. In rocketry
Jet_engine
Degree to which a process minimizes waste of resources
Efficiency is the often measurable ability to avoid making mistakes or wasting materials, energy, efforts, money, and time while performing a task. In
Efficiency
US EPA program and certification
Energy Star (trademarked ENERGY STAR) is an energy-efficiency program established in 1992. It is administered by the U.S. Environmental Protection Agency
Energy_Star
Useful power output per electrical power consumed
units, efficiency is a dimensionless number. Where it is not customary or convenient to represent input and output energy in the same units, efficiency-like
Electrical_efficiency
Indian energy organisation
Energy Efficiency Services Limited is a joint venture of state-run power companies, responsible for implementation of the Unnat Jyoti by Affordable LEDs
Energy Efficiency Services Limited
Energy_Efficiency_Services_Limited
Wind turbine in Bristol, England
focused on developing local energy supplies for the community. ALW had also engaged with the Cold Home Energy Efficiency Survey Experts (CHEESE) group
Lawrence_Weston_Wind_Turbine
Measure of efficiency in aerospace engineering
system efficiency η {\displaystyle \eta } is the efficiency with which the energy contained in a vehicle's fuel is converted into kinetic energy of the
Propulsive_efficiency
Energy efficiency, or efficient energy use, describes an optimization of the power requirements and environmental impacts of energy systems. This includes
Energy efficiency in Pennsylvania
Energy_efficiency_in_Pennsylvania
Reducing energy consumption
which consume renewable energy or energy with more efficiency). Energy conservation can be achieved through efficient energy use, which has some advantages
Energy_conservation
Autonomous intergovernmental organisation
avoid future shocks by helping to ensure reliable energy supplies, promote energy efficiency, ensure energy security and encourage technological research
International_Energy_Agency
Electric convertible sports car (2008–2012)
(Microsoft Excel), FuelEconomy.gov, U.S. Department of Energy Office of Energy Efficiency and Renewable Energy, 2011 Thiel, Christian; Krause, Jette; Dilara,
Tesla Roadster (first generation)
Tesla_Roadster_(first_generation)
stations have raised energy conservation awareness. In 1992 the U.S. Congress, as part of the Energy Policy Act (EPAct) set minimum efficiency levels (see Table
Premium_efficiency
Efficiency of energy transfer from one trophic level to next
efficiency is the efficiency with which energy is transferred from one trophic level to the next. It is determined by a combination of efficiencies relating
Ecological_efficiency
Type of flow battery technology
energy efficiency. In comparison, other long duration storage technologies such as pumped hydro energy storage provide around 80% round trip energy efficiency
Iron_redox_flow_battery
Machine that washes clothes
machines display an EU Energy Label with grades for energy efficiency, washing performance, and spin efficiency. Grades for energy efficiency run from A to G
Washing_machine
water, and geothermal power. As a result of energy saving measures, energy efficiency (the amount of energy required to produce a unit of gross domestic
Energy_in_Germany
Energy supply company based in Bristol, United Kingdom
OVO Energy is an energy supplier based in Bristol, England. It was founded by Stephen Fitzpatrick and began trading energy in September 2009, buying and
OVO_Energy
Computer energy efficiency
In computing, performance per watt is a measure of the energy efficiency of a particular computer architecture or computer hardware. Literally, it measures
Performance_per_watt
Measure of lifetime average net present cost of electricity generation
making. The energy efficiency gap phenomenon suggests demand-side energy conservation should also be considered in investment strategies and energy policy
Levelized_cost_of_electricity
Improvement potential of energy efficiency
Energy efficiency gap refers to the improvement potential of energy efficiency or the difference between the cost-minimizing level of energy efficiency
Energy_efficiency_gap
Program office of the U.S. Department of Energy
Office of Critical Minerals and Energy Innovation (CMEI) formerly known as the Office of Energy Efficiency and Renewable Energy (EERE) is an office within
Office of Energy Efficiency and Renewable Energy
Office_of_Energy_Efficiency_and_Renewable_Energy
Measure of thermal efficiency
average efficiency of that piece of equipment, including the operating transients. It is a dimensionless ratio of useful energy output to energy input,
Annual fuel utilization efficiency
Annual_fuel_utilization_efficiency
New Zealand crown agency
Energy Efficiency and Conservation Authority (EECA; Māori: Te Tari Tiaki Pūngao) is a New Zealand government/Crown agency responsible for promoting energy
Energy Efficiency and Conservation Authority
Energy_Efficiency_and_Conservation_Authority
Australian government department
Renewable energy Renewable energy target policy, regulation and co-ordination Renewable energy technology development Industrial energy efficiency Energy efficiency
Department of Climate Change, Energy, the Environment and Water
Department_of_Climate_Change,_Energy,_the_Environment_and_Water
Broad field of engineering dealing with energy
storage, energy conversion, energy materials, energy systems, energy efficiency, energy services, facility management, plant engineering, energy modelling
Energy_engineering
2002 energy review was that: The immediate priorities of energy policy are likely to be most cost-effectively served by promoting energy efficiency and
Nuclear power in the United Kingdom
Nuclear_power_in_the_United_Kingdom
Australian cabinet position
and Energy. The precursor to the department was led by Secretary Blair Comley who reported to the Minister for Climate Change and Energy Efficiency, Greg
Minister for Climate Change and Energy
Minister_for_Climate_Change_and_Energy
purpose of energy conservation, including energy audit and energy efficiency standards for certain electrical and electronic products. The Energy Commission
Energy_in_Taiwan
Energy efficiency standard for buildings
or in other definitions by renewable energy sources offsite, using technology such as heat pumps, high efficiency windows and insulation, and solar panels
Zero-energy_building
Environmentally sustainable computing and information technology
of green computing include optimising energy efficiency during the product's lifecycle; leveraging greener energy sources to power the product and its
Green_computing
ideas about energy consumption and behavior that argue that increased energy efficiency paradoxically tends to lead to increased energy consumption.
Khazzoom–Brookes_postulate
Worldwide consumption of electricity
update] Treemap showing U.S. energy consumption by sector and source in 2021 Looking forward, increasing energy efficiency will result in less electricity
Electric_energy_consumption
the energy efficiency of a dwelling is not a priority for buy to let investors. The Green Deal provided low-interest loans for energy efficiency improvements
Housing_in_the_United_Kingdom
Energy per volume
the kinetic energy of motion. Energy density differs from energy conversion efficiency (net output per input) or embodied energy (the energy output costs
Energy_density
American politician (born 1966)
projects. Ma launched the Small Business Energy Efficiency Financing and the Affordable Multifamily Energy Efficiency Financing programs in October 2019 to
Fiona_Ma
United States law
mandates, and amended utility laws to increase clean energy use and improve overall energy efficiency in the United States. The Act consists of twenty-seven
Energy_Policy_Act_of_1992
American physicist
California energy commissioner, dubbed the "Godfather of Energy Efficiency", for developing new standards which helped improve energy efficiency in California
Arthur_H._Rosenfeld
Italian natural gas company
Network Tech Company operating in the gas distribution, water services, energy efficiency, and IT sectors. Following the acquisition of 2i Rete Gas, its main
Italgas
U.S. government department regulating energy production and nuclear material handling
Energy Efficiency and Renewable Energy (EERE). That budget aimed to substantially expand the use of renewable energy sources while improving energy transmission
United States Department of Energy
United_States_Department_of_Energy
The energy efficiency implementation industry pertains to the firms which retrofit or replace inefficient equipment with the goal of reducing energy consumption
Energy efficiency implementation
Energy_efficiency_implementation
Measure of an economy's energy inefficiency
or cost of converting energy into GDP. The energy intensity of a country or region differs from its energy efficiency. Energy intensity is affected by
Energy_intensity
Architecture designed to minimize environmental impact
minimizing their negative environmental impact by enhancing efficiency, reducing material and energy consumption, and minimizing the disturbance to the surrounding
Sustainable_architecture
Table of electric car efficiency data
Real-world EV efficiency can also be expressed in miles per kilowatt-hour (mi/kWh), which converts EPA MPGe values into direct electrical energy consumption
Electric_car_EPA_fuel_economy
Overview of energy supply and use in the Philippines
government enacted the Energy Efficiency and Conservation Act (Republic Act No. 11285), which institutionalized policies on energy efficiency and conservation
Energy_in_the_Philippines
Eurovent standards for air conditioner performance depending on time of year
the seasonal efficiency of refrigeration equipment, chillers and air conditioners is often rated by the European seasonal energy efficiency ratio (ESEER)
European seasonal energy efficiency ratio
European_seasonal_energy_efficiency_ratio
The Northwest Energy Efficiency Alliance (NEEA) is a non-profit organization working to accelerate energy efficiency in the Pacific Northwest through the
Northwest Energy Efficiency Alliance
Northwest_Energy_Efficiency_Alliance
Italian utilities company established in 2017
acquiring Demand Energy (DEN) and eMotorWerks in the United States. On 20 December 2018, Enel X and Infracapital signed a deal for energy efficiency projects
Enel_X
Mode of transport
about 8% of passenger and freight transport globally, thanks to its energy efficiency and potentially high speed. Additionally, the track spreads the weight
Rail_transport
Consumption of energy by animals and societies
kinetic energy (motion) and heat. Understanding energy consumption is crucial for analyzing the efficiency of various systems and processes, as the ultimate
Energy_consumption
Multinational energy and services company
Centrica plc is a British multinational energy and services company with its headquarters in Windsor, Berkshire, England. It is the largest supplier of
Centrica
requirements for energy efficiency since the 1970s (see the history section below), it might be expected that a significant cut in domestic energy use would
Energy efficiency in British housing
Energy_efficiency_in_British_housing
Australian government program for energy efficiency rating
greenhouse gas emissions, energy efficiency, water efficiency, waste efficiency and indoor environment quality. There are also energy/greenhouse and water
NABERS
Rating scheme to summarise the energy efficiency of buildings or devices
An energy performance certificate (EPC) is a rating scheme to summarise the energy efficiency of buildings or devices. In the European Union, EPCs are
Energy performance certificate
Energy_performance_certificate
Driving using techniques that reduce fuel consumption
Energy-efficient driving techniques are used by drivers who wish to reduce their fuel consumption, and thus maximize fuel efficiency. Many drivers have
Energy-efficient_driving
American light transport truck model
March 11 - Dec 11 (PDF) (Report). U.S. Department of Energy, Energy Efficiency & Renewable Energy: Vehicle Technologies Program. January 9, 2012. INL/MIS-11-21835
Grumman_LLV
Cruise ship
Cruises. The ship is the first in a new class for the cruise line, with energy efficiency in mind that debuted in March 2025. The ship was ordered by TUI Cruises
Mein_Schiff_Relax
Inspection, survey and analysis of energy flows in a building
cost-effective opportunities for energy savings. A home energy audit is a service where the energy efficiency of a house is evaluated by a person using professional
Energy_audit
Scheme for rating the energy efficiency of buildings
Energy performance certificates (EPCs) are a rating scheme to summarise the energy efficiency of buildings. The building is given a rating between A (Very
Energy Performance Certificate (United Kingdom)
Energy_Performance_Certificate_(United_Kingdom)
American politician (born 1967)
appliance energy rules". Cleveland.com. April 2025. "Husted appliance law energy efficiency". Spectrum News 1. May 15, 2025. "Husted appliance law energy efficiency"
Jon_Husted
Multilateral agreement for energy
treaty covers all aspects of commercial energy activities including trade, transit, investments and energy efficiency. The treaty contains dispute resolution
Energy_Charter_Treaty
Environmentally responsible construction principles
on low consumption, high efficiency, economy, environmental protection, integration and optimization. Leadership in Energy and Environmental Design (LEED)
Green_building
Devices that affect energy consumption, and are subject to Energy Efficiency requirements
These products, along with energy-using products (EuP)—which rely directly on energy input—are subject to energy efficiency regulations within the European
Energy-related_products
such as energy efficiency that affects how effective a bicycle is. Bicycles are extraordinarily efficient machines; in terms of the amount of energy a person
Bicycle_performance
Building in Cambridge, England
2019. "In pictures: How Cambridge Computer Lab changed the world". BBC News. 24 April 2013. Retrieved 20 June 2019. Energy efficiency Energy efficiency
William Gates Building, Cambridge
William_Gates_Building,_Cambridge
Infrastructure Law. State and local energy policies typically relate to efficiency standards and/or transportation. Federal energy policies since the 1973 oil
Energy policy of the United States
Energy_policy_of_the_United_States
Element of walking
walking, recent studies point that arm swing improves the stability and energy efficiency in human locomotion. Those positive effects of arm swing have been
Arm_swing_in_human_locomotion
Energy supplier in the United Kingdom
Octopus Energy Group Limited (formerly Octopus Energy Limited and Octopus Energy Holdings Limited), known as Octopus Energy, is a British company operating
Octopus_Energy
Measure of energy loss in storage systems
Roundtrip efficiency is a key performance metric for an energy storage system (ESS) that characterizes the loss energy during a full cycle of charge and
Roundtrip_efficiency
Type of economic analysis that compares costs and outcomes
CEA has been applied to energy efficiency investments in buildings to calculate the value of energy saved in $/kWh. The energy in such a calculation is
Cost-effectiveness_analysis
its energy transition towards cleaner energy, Singapore will use four supply sources, supported with efforts in energy efficiency to reduce energy demand
Energy_in_Singapore
Information Administration (EIA)". "EBRD celebrates energy efficiency in Kosovo". EBRD. Retrieved 6 May 2015. "Energy Use Per Capita". World Development Indicators
List of countries by energy consumption per capita
List_of_countries_by_energy_consumption_per_capita
Energy that responsibly meets social, economic, and environmental needs
modern energy for all", including universal access to electricity and to clean cooking facilities by 2030. Energy efficiency—using less energy to deliver
Sustainable_energy
Power generation via movement of water
total electrical energy produced with the theoretical potential energy of the water passing through the turbine to calculate efficiency. Procedures and
Hydropower
United States national laboratory
Renewable Energy Laboratory (NREL), in the United States specializes in the research and development of renewable energy, energy efficiency, energy systems
National Laboratory of the Rockies
National_Laboratory_of_the_Rockies
Efficiency of charge transfer in an electrochemical reaction
Faraday efficiency (also called faradaic efficiency, faradaic yield, coulombic efficiency, or current efficiency) describes the efficiency with which
Faraday_efficiency
heat engine where the bullet has a function of a piston. The energy conversion efficiency of a firearm strongly depends on its construction, especially
Physics_of_firearms
Energy recovery mechanism
overall conversion see Embodied energy#Embodied energy in the energy field). Consider the electric motor efficiency η eng = 0.5 {\displaystyle \eta _{\text{eng}}=0
Regenerative_braking
Method of reusing thermal energy in a building
and have significantly improved the energy efficiency of buildings. Energy recovery ventilation (ERV) is the energy recovery process in residential and
Heat_recovery_ventilation
Swedish Energy Agency (Energimyndigheten in Swedish) is a government agency in Sweden responsible for the nation's energy systems, energy efficiency, and
Swedish_Energy_Agency
Voluntary computer power supply certification program
efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50%
80_Plus
ENERGY EFFICIENCY
ENERGY EFFICIENCY
Boy/Male
Indian, Sanskrit
Life's Energy; Energy of Life
Boy/Male
Tamil
Energy
Boy/Male
Tamil
Radiant energy
Boy/Male
Tamil
Energy
Girl/Female
Indian
Energy, Enthusiasm
Boy/Male
Hindu
Radiant energy
Boy/Male
Tamil
Energy
Boy/Male
Muslim
Liveliness. Energy.
Boy/Male
Hindu
Energy
Boy/Male
Hindu, Indian
Energy
Girl/Female
Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Energy
Girl/Female
Tamil
Chithanya | சீதாநà¯à®¯
Energy, Enthusiasm
Chithanya | சீதாநà¯à®¯
Male
English
English surname transferred to forename use, derived from the German personal name Emeric, EMERY means "work-power."
Boy/Male
Hindu
Energy
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi
The Energy
Girl/Female
Tamil
Energy
Girl/Female
Tamil
The energy
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Energy
Boy/Male
Bengali, Hindu, Indian, Kannada, Marathi, Telugu
Energy
Boy/Male
Hindu, Indian
Energy
ENERGY EFFICIENCY
ENERGY EFFICIENCY
Biblical
as though understanding
Boy/Male
Hindu
Blue
Boy/Male
German
Horse mighty.
Girl/Female
Greek
defender of mankind.
Boy/Male
Arabic
Ruler; Governor
Girl/Female
Tamil
Aishmani | à®à®·à¯à®®à®¾à®¨à¯€
Boy/Male
Hindu
Powerful Lord Indra bow
Boy/Male
French, German
Mind; Little Hugh; Intellect; Small Intelligent One
Girl/Female
Indian
Goddess Parvati
Boy/Male
British, English
From the People's Estate
ENERGY EFFICIENCY
ENERGY EFFICIENCY
ENERGY EFFICIENCY
ENERGY EFFICIENCY
ENERGY EFFICIENCY
n.
The privilege or benefit of clergy.
adv.
Without energy.
a. & a. pron.
Every one. Cf.
n.
Animation; spirit; vivacity; vigor; energy.
superl.
Having nervous energy; forceful; cogent.
n.
One hostile to another; one who hates, and desires or attempts the injury of, another; a foe; an adversary; as, an enemy of or to a person; an enemy to truth, or to falsehood.
v. t.
Briskness; vigor; energy; decision.
v. i.
To rise out of a fluid; to come forth from that in which anything has been plunged, enveloped, or concealed; to issue and appear; as, to emerge from the water or the ocean; the sun emerges from behind the moon in an eclipse; to emerge from poverty or obscurity.
v. t.
To apply with energy.
pl.
of Energy
n.
Power efficiently and forcibly exerted; vigorous or effectual operation; as, the energy of a magistrate.
n.
Strength of expression; force of utterance; power to impress the mind and arouse the feelings; life; spirit; -- said of speech, language, words, style; as, a style full of energy.
a.
Having no energy; sluggish.
n.
Want of vigor or energy.
n.
The act of entering or passing into or upon; entrance; ingress; hence, beginnings or first attempts; as, the entry of a person into a house or city; the entry of a river into the sea; the entry of air into the blood; an entry upon an undertaking.
n.
energy; pep.
n.
the combined healthy action of every organ of a particular system; as, the digestive synergy.
a.
Of godlike energy; inspired.
n.
Capacity for performing work.
n.
Internal or inherent power; capacity of acting, operating, or producing an effect, whether exerted or not; as, men possessing energies may suffer them to lie inactive.