1.5 kw. not kwh. kw x hours = kwh

You haven't asked, "What are people for?" before asking whether they need robots. There's the crux of the biscuit. Most of the things people do now (moving 5000 lbs of steel and rubber back and forth to jobs to sell steel and rubber) are stupid and useless as far as future people will be concerned.

Future people will be asking, "What the F were they thinking?"

The typical answer will be, "They weren't. They had advertisers for that."