My home has a 0.5-0.7kWh idle load, with the varying 0.2kWh being from the refrigerators cycling. I tried shutting down my NAS and Home server and it was less than 0.1kWh.

I'm at a loss to explain exactly what is drawing 0.4kWh of power but my neighbor has a similar load on his. I'm suspecting all of the fancy and useless motion/astro light switches installed are partially to blame but there's no easy way to verify that.