Hi Norbert: Thanks for your thoughts.
A little OT: Norbert's comments help me return to the favorite subject of energy intensity. I think that energy consumption per capita (i.e. per person) is not a very useful measure IMHO. Instead, I like to look at Energy Intensity, that is the amount of energy consumed to produce per unit of Global GDP. This way, we take the obvious bias of low energy consumption of countries where people are going hungry and not productive because of that. You can find the energy intensity measure defined and shown here.
- This article is about the term energy intensity as used in economics. For the physics concept of joules per square metre, see fluence.
Energy Intensity of different economies The graph shows the amount of energy it takes to produce a US $ of GNP for selected countries. GNP is based on 2004 purchasing power parity and 2000 dollars adjusted for inflation. Source:
Energy Information Administration Energy intensity is a measure of the energy efficiency of a nation's economy. It is calculated as units of energy per unit of GDP.
- High energy intensities indicate a high price or cost of converting energy into GDP.
- Low energy intensity indicates a lower price or cost of converting energy into GDP.
Many factors influence an economy's overall energy intensity. It may reflect requirements for general standards of living and weather conditions in an economy. It is not atypical for particularly cold or hot climates to require greater energy consumption in homes and workplaces for heating (furnaces, or electric heaters) or cooling (air conditioning, fans, refrigeration). A country with an advanced standard of living is more likely to have a wider prevalence of such consumer goods and thereby be impacted in its energy intensity than one with a lower standard of living.
Energy efficiency of appliances and buildings (through use of building materials and methods, such as insulation), fuel economy of vehicles, vehicular distances travelled (frequency of travel or larger geographical distances), better methods and patterns of transportation, capacities and utility of mass transit, energy rationing or conservation efforts, 'off-grid' energy sources, and stochastic economic shocks such as disruptions of energy due to natural disasters, wars, massive power outages or unexpected new sources or efficient uses of energy may all impact overall energy intensity of a nation.
Based on the energy intensity measure, US seems to be in the middle of the pack. US has a lower (meaning better) energy intensity than Norway, Netherlands, Iran. However, it is less efficient than Germany, UK, Japan & India. It is about par with China, thus suggesting that even this measure may have some inherent bias. However, I find it a better measure than energy consumption per capita. So, it is true that US has some ways to go before it can claim to be in the top quartile on energy intensity. I think improving energy efficiency and energy intensity is the best way to reduce energy dependence. The alternative fuels such as those derived from biofuels are just a mirage.
For example, hydrogen is a complete lost cause because in producing fuel hydrogen, you lose roughly half the energy in the processing. That is energy efficiency of hydrogen as a transportation fuel will always be less than hydrocarbon fuels (which do not carry this large an efficiency loss). And "Hard Stops" (thermodynamic limitations) eliminate the possibility of improving the hydrogen production technology thru innovation, unless we have nuclear fusion based "free" energy to break water into hydrogen and oxygen. If we have unlimited "free" fusion energy, then we won't want to even bother with hydrogen and just go straight to using electricity so generated!
We instead need to focus on improving the most inefficient links in the chain : Motive power for transport (avoid the Internal Combustion Engine which has less than 20% energy efficiency) and the generation of electricity. Anyway, I think I have digressed enough from the original thread. JMHO .... Anil