The average house, even in your 'green' region, can support itself with solar panels on the roof but it is presently cost prohibitative.
Define average. My electricity needs vary radically. Summer usage is typically 2 1/2 times winter. Water usage is similar. Much more in the summer. Natural gas usage peaks in January and is at a minimum in the summer.
Trying to run solar panels with snow and temperatures that can drop to -20 F isn't reasonable.