World total primary energy consumption by type in 2020
59-446: World total primary energy supply of 162,494 TWh (or 13,792 Mtoe ) by region in 2017 (IEA, 2019) Primary energy ( PE ) is the energy found in nature that has not been subjected to any human engineered conversion process. It encompasses energy contained in raw fuels and other forms of energy, including waste, received as input to a system . Primary energy can be non-renewable or renewable . Total primary energy supply ( TPES )
118-428: A battery is usually expressed indirectly by its capacity in ampere-hours ; to convert ampere-hour (Ah) to watt-hours (Wh), the ampere-hour value must be multiplied by the voltage of the power source. This value is approximate, since the battery voltage is not constant during its discharge, and because higher discharge rates reduce the total amount of energy that the battery can provide. In the case of devices that output
177-401: A change over time. For example: miles per hour, kilometres per hour, dollars per hour. Power units, such as kW, already measure the rate of energy per unit time (kW= kJ / s ). Kilowatt-hours are a product of power and time, not a rate of change of power with time. Watts per hour (W/h) is a unit of a change of power per hour, i.e. an acceleration in the delivery of energy. It is used to measure
236-442: A different voltage than the battery, it is the battery voltage (typically 3.7 V for Li-ion ) that must be used to calculate rather than the device output (for example, usually 5.0 V for USB portable chargers). This results in a 500 mA USB device running for about 3.7 hours on a 2,500 mAh battery, not five hours. The Board of Trade unit (B.T.U.) is an obsolete UK synonym for kilowatt-hour. The term derives from
295-437: A factor of about three. The false notion that all primary energy from thermal fossil fuel sources has to be replaced by an equivalent amount of non thermal renewables (which is not necessary as conversion losses do not need to be replaced) has been termed the "primary energy fallacy". Kilowatt hour#Watt hour multiples and billing units A kilowatt-hour ( unit symbol : kW⋅h or kW h ; commonly written as kWh )
354-487: A higher-capacity but non-Energy Star rated dehumidifier may be a more energy efficient alternative than an Energy Star rated but lower-capacity model. The Energy Star program's savings calculator has also been criticized for unrealistic assumptions in its model that tend to magnify savings benefits to the average consumer. Another factor yet to be considered by the EPA and DOE is the overall effect of energy-saving requirements on
413-452: A primary energy source. Primary energy is used as a measure in energy statistics in the compilation of energy balances , as well as in the field of energetics. In energetics, a primary energy source (PES) refers to the energy forms required by the energy sector to generate the supply of energy carriers used by human society. Primary energy only counts raw energy and not usable energy and fails to account well for energy losses, particularly
472-526: A product family are measured and reported against an allowance set by the maximum throughput of the device. Operation modes (OM) are measured and reported for devices such as inkjet products against an allowance set by the functions present in the EUT (equipment under test). Devices that included "adders" such as Ethernet, on-board memory, wireless, etc. are mathematically "added" to increase the OM allowance. On February 1, 2011,
531-780: A scale of 1 to 100, provide a means for benchmarking the energy efficiency of specific buildings and industrial plants against the energy performance of similar facilities. The ratings are used by building and energy managers to evaluate the energy performance of existing buildings and industrial plants. The rating systems are also used by EPA to determine if a building or plant can qualify to earn Energy Star recognition. In 2020 Energy Star released an updated guide for verifying Energy Star certifications. Energy Star ratings have been compared to other clean energy rating systems and green building certification systems such as those by independent firms like MiQ , or LEED certifications for office buildings. The number of space types that can receive
590-793: A typical value is three units of source energy for one unit of site energy. However, this can vary considerably depending on factors such as the primary energy source or fuel type, the type of power plant, and the transmission infrastructure. One full set of conversion factors is available as technical reference from Energy STAR . Either site or source energy can be an appropriate metric when comparing or analyzing energy use of different facilities. The U.S Energy Information Administration , for example, uses primary (source) energy for its energy overviews but site energy for its Commercial Building Energy Consumption Survey and Residential Building Energy Consumption Survey. The US Environmental Protection Agency 's Energy STAR program recommends using source energy, and
649-451: A unit in the left column to the units in the top row, multiply by the factor in the cell where the row and column intersect. All the SI prefixes are commonly applied to the watt-hour: a kilowatt-hour is 1,000 Wh (kWh); a megawatt-hour is 1 million Wh (MWh); a milliwatt-hour is 1/1,000 Wh (mWh) and so on. The kilowatt-hour is commonly used by electrical energy providers for purposes of billing, since
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#1732858235162708-619: A variety of tests to prove that the products will display the following characteristics: New homes or apartments that earn the Energy Star label have been verified to meet energy efficiency requirements set by U.S. EPA. Energy Star certified homes are at least 10% more efficient than homes built to code and achieve a 20% improvement on average, while providing homeowners with better quality, performance, and comfort. Nearly 1.9 million Energy Star certified homes and apartments have been certified to date. These high-performing homes can be found across
767-476: A voluntary labeling program designed to identify and promote energy-efficient products, Energy Star began with labels for computers and their peripherals . In 1995 the program was significantly expanded, introducing labels for residential heating and cooling systems and new homes. In 2000, the Consortium for Energy Efficiency was directed by members to begin an annual survey of Energy Star impact. According to
826-485: A yearly basis, in units such as megawatt-hours per year (MWh/yr) gigawatt-hours/year (GWh/yr) or terawatt-hours per year (TWh/yr). These units have dimensions of energy divided by time and thus are units of power. They can be converted to SI power units by dividing by the number of hours in a year, about 8760 h/yr . Thus, 1 GWh/yr = 1 GWh/8760 h ≈ 114.12 kW . Many compound units for various kinds of rates explicitly mention units of time to indicate
885-575: Is a non-SI unit of energy equal to 3.6 megajoules (MJ) in SI units, which is the energy delivered by one kilowatt of power for one hour . Kilowatt-hours are a common billing unit for electrical energy supplied by electric utilities . Metric prefixes are used for multiples and submultiples of the basic unit, the watt-hour (3.6 kJ). The kilowatt-hour is a composite unit of energy equal to one kilowatt (kW) sustained for (multiplied by) one hour. The International System of Units (SI) unit of energy meanwhile
944-566: Is an energy-efficiency program administered by the U.S. Environmental Protection Agency (EPA) in partnership with the U.S. Department of Energy (DOE). The EPA establishes energy efficiency specifications, and those that meet these specifications are eligible to display the ENERGY STAR logo. More than 75 product categories are eligible for the ENERGY STAR label, including appliances, electronics, lighting, heating and cooling systems, and commercial equipment such as food service products. In
1003-484: Is another example of secondary energy. According to the laws of thermodynamics , primary energy sources cannot be produced. They must be available to society to enable the production of energy carriers. Conversion efficiency varies. For thermal energy, electricity and mechanical energy production is limited by Carnot's theorem , and generates a lot of waste heat . Other non-thermal conversions can be more efficient. For example, while wind turbines do not capture all of
1062-529: Is calculated by multiplying the device's power consumption in kilowatts by the operating time in hours, and by the price per kilowatt-hour. The unit price of electricity charged by utility companies may depend on the customer's consumption profile over time. Prices vary considerably by locality. In the United States prices in different states can vary by a factor of three. While smaller customer loads are usually billed only for energy, transmission services, and
1121-636: Is limited by the current specifications. Standby power consumption for televisions must be 3 watts or less. A wider range of Energy Star qualified televisions will be available. Other qualified home electronics include cordless phones, battery chargers, VCRs and external power adapters, most of which use 90% less energy. The Energy Star Program Requirements for Imaging Products are focused on product families such as electrophotographic (EP) printers, inkjet printers (e.g., thermal), copiers, facsimile machines and other imaging equipment including MFD 's (multifunctional devices). Typical Electrical Consumption (TEC) of
1180-450: Is measured in watts , or joules per second . For example, a battery stores energy. When the battery delivers its energy, it does so at a certain power, that is, the rate of delivery of the energy. The higher the power, the quicker the battery's stored energy is delivered. A higher power output will cause the battery's stored energy to be depleted in a shorter time period. Electric energy production and consumption are sometimes reported on
1239-445: Is often expressed as terawatt-hours (TWh) for a given period that is often a calendar year or financial year . A 365-day year equals 8,760 hours, so over a period of one year, power of one gigawatt equates to 8.76 terawatt-hours of energy. Conversely, one terawatt-hour is equal to a sustained power of about 114 megawatts for a period of one year. In 2020, the average household in the United States consumed 893 kWh per month. Raising
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#17328582351621298-488: Is the exergy of a system. Site energy is the term used in North America for the amount of end-use energy of all forms consumed at a specified location. This can be a mix of primary energy (such as natural gas burned at the site) and secondary energy (such as electricity). Site energy is measured at the campus, building, or sub-building level and is the basis for energy charges on utility bills. Source energy, in contrast,
1357-474: Is the joule (symbol J). Because a watt is by definition one joule per second , and because there are 3,600 seconds in an hour, one kWh equals 3,600 kilojoules or 3.6 MJ. A widely used representation of the kilowatt-hour is kWh , derived from its component units, kilowatt and hour. It is commonly used in billing for delivered energy to consumers by electric utility companies, and in commercial, educational, and scientific publications, and in
1416-441: Is the sum of production and imports, plus or minus stock changes, minus exports and international bunker storage. The International Recommendations for Energy Statistics (IRES) prefers total energy supply ( TES ) to refer to this indicator. These expressions are often used to describe the total energy supply of a national territory. Secondary energy is a carrier of energy, such as electricity. These are produced by conversion from
1475-487: Is the term used in North America for the amount of primary energy consumed in order to provide a facility's site energy. It is always greater than the site energy, as it includes all site energy and adds to it the energy lost during transmission, delivery, and conversion. While source or primary energy provides a more complete picture of energy consumption, it cannot be measured directly and must be calculated using conversion factors from site energy measurements. For electricity,
1534-467: Is used with loads or output that vary during the year but whose annual totals are similar from one year to the next. For example, it is useful to compare the energy efficiency of household appliances whose power consumption varies with time or the season of the year. Another use is to measure the energy produced by a distributed power source. One kilowatt-hour per year equals about 114.08 milliwatts applied constantly during one year. The energy content of
1593-541: The US Department of Energy uses site energy in its definition of a zero net energy building . Where primary energy is used to describe fossil fuels , the embodied energy of the fuel is available as thermal energy and around two thirds is typically lost in conversion to electrical or mechanical energy. There are very much less significant conversion losses when hydroelectricity, wind and solar power produce electricity, but today's UN conventions on energy statistics counts
1652-433: The annual electricity generation for whole countries and the world energy consumption . A kilowatt is a unit of power (rate of flow of energy per unit of time). A kilowatt-hour is a unit of energy. Kilowatt per hour would be a rate of change of power flow with time. Work is the amount of energy transferred to a system; power is the rate of delivery of energy. Energy is measured in joules , or watt-seconds . Power
1711-606: The ENERGY STAR NextGen Certified Homes and Apartments, will be launched in 2023. This new certification uses a baseline of the ENERGY STAR Single-Family and Multifamily certification, with additional requirements such as heat pump water heaters and EV-ready charging capabilities. The Energy Star program has developed energy performance rating systems for several commercial and institutional building types and manufacturing facilities. These ratings, on
1770-752: The ENERGY STAR program are implemented in Canada, Japan, and Switzerland. In 2018, a 15-year long agreement with the European Union expired. A previous agreement with the European Free Trade Association also ended. The Energy Star program was established by the Environmental Protection Agency in 1992 and operates under the authority of the Clean Air Act , section 103(g), and the 2005 Energy Policy Act , section 131 (which amended
1829-527: The EPA. Energy Star 4.0 specifications for computers became effective on July 20, 2007. The requirements are more stringent than the previous specification and existing equipment designs can no longer use the service mark unless re-qualified. They require the use of 80 Plus Bronze level or higher power supplies . Energy Star 5.0 became effective on July 1, 2009. Energy Star 6.1 became effective on September 10, 2014. Energy Star 7.1 became effective on November 16, 2018. The Version 8.0 specification for computers
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1888-615: The EPA/DOE added the requirement that all products registered under the Energy Star service mark, must be tested by an AB (Accredited Body) or CB (Certification Body) Laboratory. The Energy Star is awarded to only certain bulbs that meet strict efficiency, quality, and lifetime criteria. Energy Star qualified fluorescent lighting uses 75% less energy and lasts up to ten times longer than normal incandescent lights . Energy Star Qualified light-emitting diode (LED) Lighting: To qualify for Energy Star certification, LED lighting products must pass
1947-648: The Energy Policy and Conservation Act, section 324). Since 1992, Energy Star and its partners are estimated to have reduced various energy bills by at least $ 430 billion. The EPA manages Energy Star products, as well as home and commercial/industrial programs. The EPA develops and manages Energy Star Portfolio Manager, an online energy tracking and benchmarking tool for commercial buildings. The DOE manages Home Performance with Energy Star and provides technical support, including test procedure development for products and some verification testing of products. Initiated as
2006-528: The Energy Star program. The award was established in 1999. In March 2010, the Government Accountability Office (GAO) performed covert testing of the Energy Star product certification process and found that Energy Star was for the most part a self-certification program that was vulnerable to fraud and abuse. While the GAO demonstrated, by submitting fake products from made-up companies, that cheating
2065-415: The SI. An electric heater consuming 1,000 watts (1 kilowatt) operating for one hour uses one kilowatt-hour of energy. A television consuming 100 watts operating continuously for 10 hours uses one kilowatt-hour. A 40-watt electric appliance operating continuously for 25 hours uses one kilowatt-hour. Electrical energy is typically sold to consumers in kilowatt-hours. The cost of running an electrical device
2124-506: The U.S. Energy and Employment Report for 2016, 290,000 American workers are involved in the manufacture of Energy Star certified products and building materials. The report also projects that employment in energy efficiency will grow much faster than other areas of the energy sector—9 percent in 2017 vs. average projected growth of 5 percent across all of the energy sector—and that Energy Star will be an integral part of that market. Energy Star specifications differ with each item, and are set by
2183-548: The U.S. and include a complete thermal enclosure system, a high-efficiency heating, ventilation and cooling system, a comprehensive water management system, and energy-efficient lighting and appliances. Together, U.S. homeowners living in certified homes saved $ 360 million on their energy bills in 2016 alone. In 2020, ENERGY STAR separated single-family and multifamily construction types into their own programs: Single-Family New Construction (SFNC) and Multifamily New Construction (MFNC). A new tier of ENERGY STAR certification, called
2242-517: The United States, the ENERGY STAR label often appears with the EnergyGuide label of eligible appliances to highlight energy-efficient products and compare energy use and operating costs. One of the most successful voluntary initiatives introduced by the U.S. government, the program has saved 5 trillion kilowatt-hours of electricity, more than US$ 500 billion in energy costs, and prevented 4 billion metric tons of greenhouse gas emissions. Elements of
2301-873: The category, including floor area , occupancy and energy consumption data into a free online tool provided by Energy Star. Energy Star energy performance ratings have been incorporated into some green buildings standards, such as LEED for Existing Buildings. In the U.S., builders of energy efficient homes are able to qualify for Federal Income tax credits and deductions. Energy Star estimated in 2020 that energy use in commercial buildings accounts for 20% of greenhouse gas emissions, costing more than $ 100B per year. Some examples of specialised industrial facilities which Energy Star has designed specific performance ratings for include: The U.S. Environmental Protection Agency (EPA) annually recognizes small businesses that demonstrate abilities to reduce waste, conserve energy, and recycle. The businesses use resources and ideas outlined in
2360-558: The daily variation of demand (e.g. the slope of the duck curve ), or ramp-up behavior of power plants . For example, a power plant that reaches a power output of 1 MW from 0 MW in 15 minutes has a ramp-up rate of 4 MW/h . Other uses of terms such as watts per hour are likely to be errors. Several other units related to kilowatt-hour are commonly used to indicate power or energy capacity or use in specific application areas. Average annual energy production or consumption can be expressed in kilowatt-hours per year. This
2419-594: The durability and expected service life of a mass-market appliance built to a consumer-level cost standard. For example, a refrigerator may be made more efficient by the use of more insulative spacing and a smaller-capacity compressor using electronics to control operation and temperature. However, this may come at the cost of reduced interior storage (or increased exterior mass) or a reduced service life due to compressor or electronic failures. In particular, electronic controls used on new-generation appliances are subject to damage from shock, vibration, moisture, or power spikes on
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2478-570: The electrical circuit to which they are attached. Critics have pointed out that even if a new appliance is energy efficient, any consumer appliance that does not provide customer satisfaction, or must be replaced twice as often as its predecessor contributes to landfill pollution and waste of natural resources used to construct its replacement. Energy Star qualified heat pumps, boilers, air conditioning systems, and furnaces are available. In addition, cooling and heating bills can be significantly lowered with air sealing and duct sealing. Air sealing reduces
2537-425: The electricity made from hydroelectricity, wind and solar as the primary energy itself for these sources. One consequence of employing primary energy as an energy metric is that the contribution of hydro, wind and solar energy is under reported compared to fossil energy sources, and there is hence an international debate on how to count energy from non thermal renewables, with many estimates having them undercounted by
2596-533: The energy performance rating in Portfolio Manager is expanding and now includes housing, bank/financial institutions, courthouses, hospitals (acute care and children's), hotels and motels, houses of worship, K-12 schools, medical offices, offices, residence halls/dormitories, retail stores, supermarkets, warehouses (refrigerated and non-refrigerated), hotels (see hotel energy management ) , data centers, senior care facilities, and wastewater facilities. See
2655-553: The field of energetics , these forms are called energy carriers and correspond to the concept of "secondary energy" in energy statistics. Energy carriers are energy forms which have been transformed from primary energy sources. Electricity is one of the most common energy carriers, being transformed from various primary energy sources such as coal, oil, natural gas, and wind. Electricity is particularly useful since it has low entropy (is highly ordered) and so can be converted into other forms of energy very efficiently. District heating
2714-631: The label. In order to be recognized, labs and certification bodies must meet specified criteria and be subject to oversight by a recognized accreditation body. In addition, a percentage of Energy Star certified product models in each category are subject to off-the-shelf verification testing each year. As of 2017, there are 23 independent certification bodies and 255 independent laboratories recognized for purposes of Energy Star product certification and testing. Most cover multiple product types. In 2016, 1,881 product models were subject to verification testing with an overall compliance rate of 95%. In March 2017
2773-523: The large losses in thermal sources. It therefore generally grossly undercounts non thermal renewable energy sources . Primary energy sources should not be confused with the energy system components (or conversion processes) through which they are converted into energy carriers. Primary energy sources are transformed in energy conversion processes to more convenient forms of energy that can directly be used by society, such as electrical energy , refined fuels , or synthetic fuels such as hydrogen fuel . In
2832-526: The media. It is also the usual unit representation in electrical power engineering. This common representation, however, does not comply with the style guide of the International System of Units (SI). Other representations of the unit may be encountered: The hour is a unit of time listed among the non-SI units accepted by the International Bureau of Weights and Measures for use with
2891-485: The minimum guidelines, purchasing an Energy Star labeled product does not always mean one is getting the most energy efficient option available. For example, dehumidifiers that are rated under 25 US pints (12 L) per day of water extraction receive an Energy Star rating if they have an energy factor of 1.2 (higher is better), while those rated 25 US pints (12 L) to 35 US pints (17 L) per day receive an Energy Star rating for an energy factor of 1.4 or higher. Thus
2950-478: The minimum standard. Dishwashers need at least 41% savings. Most appliances as well as heating and cooling systems have a yellow EnergyGuide label showing the annual cost of operation compared to other models. This label is created through the Federal Trade Commission and often shows if an appliance is Energy Star rated. While an Energy Star label indicates that the appliance is more energy efficient than
3009-403: The monthly energy consumption of a typical residential customer ranges from a few hundred to a few thousand kilowatt-hours. Megawatt-hours (MWh), gigawatt-hours (GWh), and terawatt-hours (TWh) are often used for metering larger amounts of electrical energy to industrial customers and in power generation. The terawatt-hour and petawatt-hour (PWh) units are large enough to conveniently express
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#17328582351623068-543: The name of the Board of Trade which regulated the electricity industry until 1942 when the Ministry of Power took over. This should not be confused with a British Thermal Unit (BTU) which is 1055 J. In India, the kilowatt-hour is often simply called a unit of energy. A million units, designated MU , is a gigawatt-hour and a BU (billion units) is a terawatt-hour. Energy Star Energy Star (trademarked ENERGY STAR )
3127-498: The outdoor air that penetrates a building, and duct sealing prevents attic or basement air from entering ducts and lessening the heating/cooling system’s efficiency. Energy Star qualified room air conditioners are at least 10% more energy efficient than the minimum U.S. federal government standards. Energy Star qualified televisions use 30% less energy than average. In November 2008, television specifications were improved to limit on-mode power use, in addition to standby power which
3186-423: The rated capacity, larger consumers also pay for peak power consumption, the greatest power recorded in a fairly short time, such as 15 minutes. This compensates the power company for maintaining the infrastructure needed to provide peak power. These charges are billed as demand changes. Industrial users may also have extra charges according to the power factor of their load. Major energy production or consumption
3245-403: The technical descriptions for models used in the rating system at. These documents provide detailed information on the methodologies used to create the energy performance ratings including details on rating objectives, regression techniques, and the steps applied to compute a rating. Energy Star maintains a 1–100 national benchmarking rating for buildings based on building attributes depending on
3304-403: The temperature of 1 litre of water from room temperature to the boiling point with an electric kettle takes about 0.1 kWh. A 12 watt LED lamp lit constantly uses about 0.3 kW⋅h per 24 hours and about 9 kWh per month. In terms of human power , a healthy adult male manual laborer performs work equal to about half a kilowatt-hour over an eight-hour day. To convert a quantity measured in
3363-443: The wind's energy, they have a high conversion efficiency and generate very little waste heat since wind energy is low entropy. In principle solar photovoltaic conversions could be very efficient, but current conversion can only be done well for narrow ranges of wavelength, whereas solar thermal is also subject to Carnot efficiency limits. Hydroelectric power is also very ordered, and converted very efficiently. The amount of usable energy
3422-776: Was finalized on October 15, 2019 and became effective on October 15, 2020. The EPA released Version 1.0 of the Computer Server specifications on May 15, 2009. It covered standalone servers with one to four processor sockets . A second tier to the specification adding active state power and performance reporting for all qualified servers, as well as blade and multi-node server idle state requirements became effective December 16, 2013. The Version 2.0 Energy Star specification for Computer Servers came into effect on December 16, 2013. The Version 3.0 Energy Star specification for Enterprise Servers came into effect on June 17, 2019 [1] . As of early 2008, average refrigerators need 20% savings over
3481-410: Was possible, they found no evidence of consumer fraud relating to the quality or performance of Energy Star qualified products. In response, the Environmental Protection Agency instituted third-party certification of all Energy Star products starting in 2011. Under this regime, products are tested in an EPA-recognized laboratory and reviewed by an EPA-recognized certification body before they can carry
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