Re: segway- whatever happened to it

In article <s-adnVoPHK73YRrVnZ2dnUVZ_r7inZ2d@xxxxxxx>,
"David L. Johnson" <david.johnson@xxxxxxxxxx> wrote:

Ryan Cousineau wrote:

Durability of the battery packs is a big deal, because electricity is
way cheaper per joule than the common fuels (gas, diesel, propane, CNG).

I don't get this. How can that be? Seeing as how electricity is often
generated by burning common fuels. In the US, that fuel is often coal
or natural gas, While it might be that coal is much cheaper per joule
than gasoline in an internal combustion engine, it's hard to see why
natural gas would be. And in the US, there is precious little
electricity generated by wind, direct solar, or nukes.

With most of the energy coming from the same process, and a lot more
inefficiency in battery-powered cars, how does it end up "way cheaper"?

1 gallon of gasoline has about 131 MJ of energy. This is equivalent to
36.4 kWh. Assuming the rate of electricity is $0.15* per kWh for the
end consumer, the energy equivalent of 1 gallon of gasoline is $5.50.
To achieve equivalence to the national average price of $4 per gallon of
gasoline, electricity need to cost $0.11 per kWh.

* This figure was used for convenience. It may be significantly lower
than peak rates in CA, but it also may be significantly higher than
off-peak rates.
.

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