You _might_ be able to convince the POCO and AHJ to let you run two separate services.

Instead of running a single 200A service, you would put the ordinary general lighting loads on a 100A service and any large appliance loads on a separate service sized appropriately. Then design for different voltage drops on these two services.

On the general lighting service you would size to get 3-4% VD at the calculated demand. When everything in the house is on, the lights might be a little dim, but they won't be flickering.

Then put things like the well pump, electric range, heat pump, etc. on the other service. Make sure that each of these components is suitably rated to tolerate large voltage drop. Motors draw large inrush current when starting, and voltage drop can make it difficult for the motor to start under load, which means more time spent in the high slip, low efficiency, high heating operating state. But when the load characteristics are suitable, 'reduced voltage' starting is a common technique used to reduce the inrush current going to large motors. IMHO if the large appliances are carefully selected, the startup voltage drop might be a good thing. Electric heat won't have a problem with voltage drop; the heating element will produce less heat, but the thermostat will keep it on longer.

You'd have to convince the AHJ to permit this under 230.2(D), different voltages [Linked Image] Seriously, read 230(2).

You'll want to make sure the meters are placed at the house if the POCO will allow this; otherwise the customer will be paying for the electricity burned in the voltage drop.

-Jon