steady rate of high power for one. except for hydro and geothermal, but those doesn't fit or scale everywhere.
solar and wind are great to supply additional power, to cover spikes, and a large residential setup will stabilize the old grid. however they don't have a constant high power output and have to be built at 30-50% over capacity to get to the minimum useful outputs.
that said most homes should have a 3-5 kw solar setup that feed right back into the grid. The power generated would be enough to run their home air-conditioning setups in the hot summer months and a bit of electric heating in the winter. if 50% of homes in a given neighborhood loop had that the spikes would even out during the summer.