There are parts of the
There are parts of the country that do not use fossil fuels for power generation, in those regions electricity costs very little. I pay 7.2 cents a kwhr in eastern washington where I live and in seattle where I work I pay 11 cents a kwhr for my apartment. There are areas close to dams in washington that dip below 4 cents a kwhr.
As green power installations age beyond their financed life span you can expect to see massive price drops. All those windmills that are going up all over the country have huge loans to finance their construction. Once those are paid off they will be able to massively undercut coal and gas plants. Granted they have to outlive their financing but more than likely many installations will.