Fuel Cell Performance

>An off-grid PV home would first be energy efficient and superinsulated
>in Amory Lovins' _Soft Energy Paths_ scenario so energy use for electric
>would be closer to 24kWh/day for a four person home.
>
US housing is $10 trillion of sunk capital. We have houses near us that
are close to 100 years old. New houses being built today are double the
size of old single-family houses, and not terribly energy-efficient. If
your energy scenario requires $10 trillion worth of replacement costs
and enforcement of draconian limitations on new home buyers, I think the
rest of us are quite happy to plan for energy needs in the real world,
thankyou very much.