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They had those things (electric heat, electric A/C, etc.) with the EV1.
The have electric accessories for their fuel celled vehicles.
It seems odd that only now do they say that this is slowing them down.
2002: GM's Skateboard From Planet Zog | Road Tests, Auto Features
"The 42-volt electrical system includes a docking port in the centre of the chassis, to which the electronically operated steering, brakes, heating, air conditioning, central locking, window opening and so on are linked."