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Posted

The world is in desperate need of new super efficient battery technology.  Right now to power a light bulb we pay something like, 10 cents per kilowatt hour (kwh).  The cost per kwh to power a flashlight by the use of batteries, is something like $1000.  The feasibility of Electric cars is questionable, but there may be other developments that come as a consequence of such a products development.  I'd bet the money is in the battery, but who knows-we definitely don't know enough information.  Buffett has been very consistent in allocating Berkshire's capital, but there have been times when a particular action causes confusion.  This I suspect is one of those times. 

Posted

Maybe I did't explain clearly.  The following is largely from Richard Muller.

 

  Here are a few costs of energy per kilowatt-hour from various sources:

 

Coal: 0.4¢ per kWh (coal costs $40 per ton)

Natural gas: 3.4¢ per kWh (gas costs $10 per million cubic feet)

Gasoline: 7.5¢ (at $2.50 per gallon; the price changes frequently)

Car battery: 21¢ per kWh (the cost is the $50 per battery to replace)

Computer battery: $4 per kWh (500 charges $100 per battery)

AAA battery: $1000 per kWh (cost is $1.50 per battery)

 

 

It's difficult to compare the costs of energy because different fuels and produce varying amounts of energy.  Below provides a cost comparison in terms of electricity.   

 

Fuel
market cost
cost per kWh (1000 Cal)
cost if converted to electricity

coal
$40 per ton
0.4¢
1.2¢

natural gas
$10 per million cubic feet

gasoline
$3 per gallon
27¢

electricity
$0.10 per kWh
10¢
10¢

 

 

 

For a good discussion on Electric Cars see:

http://muller.lbl.gov/teaching/physics10/old%20physics%2010/physics%2010%20notes/Electric%20cars%20.html

 

 

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