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Transformers are cheap but most residences are not equipped to handle that much current in a short while. I think what they do is put an equivalent capacitor bank in your garage which charges over time via the transformer.
When you plug in, the charge is transferred fairly quickly to your car.
They claim that the charge dissipation rate is low, as little as 0.1% per month which is better than any other storage medium out there.
Because a charge can be transferred in only 5 minutes, the charging could be done at vehicle stations and remove the garage requirement completely.
Moreover, the components of the EESU are all non-toxic which is more than can be said for other storage media.
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