I do like the decentralising nature of this, but I'm not too sure that the costs of domestic power would be low enough for a ROI in a reasonable time frame. Also, domestic power supplies are rated at under 10 kW and a 'Rig' is going to pull about 1/3 of that, so one would have to use high power domestic appliances (your electric oven / hob, your shower, your washer / dryer, etc) on a roat system, which would be easy to manage for a couple of folks living together, but a PITA for a larger group.