For this reason battery performance is usually measured in watts (a unit of energy calculated by multiplying voltage x amperage) per liter or watts per kilogram.
It produces less carbon dioxide for a unit of energy than coal or oil, so the climate will benefit to the degree that gas replaces either of those: it will mostly substitute for coal, though some oil too, especially if gas-powered trucking becomes widespread.
To turn the ratio around: If you want to displace a unit of petroleum energy, you have to burn four-fifths of a unit in fossil fuels.
The IEA uses a complex calculation called the carbon intensity index to show how much CO2 is emitted to provide a given unit of energy.
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Notable additions include natural gas company Spectra Energy, ranked 734, which was a former unit of Duke Energy, ranked 233.
The latest orders are with two German companies, Belectric and Plain Energy, and with EDF Energies Nouvelles, a unit of the French energy giant.
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Azurix was a unit of the failed energy trader Enron, which went bankrupt last year.
But a recently published survey of the various conflicting engineering studies comes up with a plausible compromise estimate: Every unit of energy that goes into making ethanol from corn produces ethanol that yields 1.27 units of energy.
The i3 will be powered by huge lithium-ion batteries positioned under the floorboards (a distribution of weight that eases handling) with a drive system, chassis and energy storage unit all incorporated into a body module made of aluminium.
Crane devised a new measure of energy consumption: a three-dimensional unit he called a cubic mile of oil.
One of the largest employers was Sandia National Laboratories, a Department of Energy unit established in 1949 to develop nuclear weapons and now also working on solutions to nonmilitary problems in energy, computing and geologic sciences.
The much-maligned SUV may serve as a better unit of measure to frame the energy and political dynamic here.
Competitor GE Wind Energy, a unit of General Electric, ranked number one in wind turbines sales in the U.S. in 2009, according to a recent report from the American Wind Energy Association.
In 2006 China set a target of a 20% cut by 2010 of its energy intensity (the amount of energy consumed per unit of GDP).
There was also a slight increase in the CO2 intensity of U.S. energy supply (CO2 per unit of energy) in 2010, which is in contrast to a drop of 2.4% in 2009.
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Currently, natural gas is about one-third the price of crude oil on a per unit energy basis.
This extreme density reduces, per a given unit of work, the datacenter size, energy consumption, complexity and cost.
But while the country's energy intensity--the amount of energy required to produce a unit of economic growth--is improving, it is not improving enough to offset the pace of growth of the economy, the population and living standards.
And one of the things that a company like ARC Energy is doing is trying to bring down the unit cost for each of those light bulbs.
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Energy density refers to the quantity of energy that can be contained in a given unit of volume, area, or mass.
The carbon dioxide intensity of U.S. energy supply (CO2 per unit of energy) in 2009 also dropped as a result of lower natural gas prices relative to coal.
Power density refers to the energy flow that can be harnessed from a given unit of volume, area or mass.
MidAmerican Energy is the operator of a 1600 megawatt four unit coal-fired power plant in Council Bluffs, Iowa, commonly known as Walter Scott, Jr.
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In 2006, the first year of the plan, the country's reduction in energy intensity, which measures energy consumption per unit of economic output, was a mere 1.23%.
Last week, the regulator, Ofgem, published its simplification plan, which said suppliers would be forced to have no-frills tariffs, which would consist of a standing charge - fixed by the regulator - plus a unit charge for energy used.
But Prof David Elliott, co-director of the Energy and Environment Research Unit at the Open University, said a single barrage was "pretty hopeless" in energy provision terms as it would only produce power in two bursts during a 24-hour period.
Many consumers will just replace the outside compressor unit when it fails and limp along with a smaller interior evaporator coil, negating most of the energy savings.
Genesis Energy reported third quarter earnings per unit, excluding a one-time tax benefit, of 29 cents on November 6, matching the Zacks Consensus Estimate but beating the year-ago earnings by 7%.
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The power electronics unit integrated in the engine compartment operates at a level of around 370V and manages the flow of high-voltage energy to and from the battery and the electric motors.
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Vessels powered by LNG typically are less polluting that those using more traditional fossil fuels, and the Lockheed unit believes it can apply similar aerospace technologies to a wide range of supply-chain opportunities in the rapidly-expanding energy sector.
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