Oh -- you meant independent of coal and nat gas and nuclear and hydro -- or something to that effect?

Because those the things that power the grid today. The things that wind/solar merely supplement.
With sufficient amounts of NEW 3rd gen nuclear we could shutter the coal plants and tear down the hydro plants.. Thus freeing the salmon and the rivers, cutting REAL pollution, and making a HUGE dent in CO2 emissions. Could do that in 4 or 5 years if we really wanted to..
Despite the obtuse response I would guess that you still understand this logic: Each house that has solar panels means one house less dependent on the grid and that much more power available for other uses That should be simple enough math for anyone to grasp.
Having home solar is really a commitment to be in the energy biz. You gotta wade thru the screwing that you get on surcharges for line maintenance, reduced reimbursements on the EXCESS the energy that you sell back into grid and design your system for energy "independence". Which means it has to be SCALED to provide WAYY more than what you need for the home. The game is to BE an energy provider during the peak day, to subsidize the 14 hours per day, when you must draw power from the grid. The math is NOT in your favor in MANY regions of the country. It's a REGIONAL option.
And then there is the reality that by YOU be an energy mogul for 6 or 8 hours a day -- you make it SOMEONE ELSE'S problem, to provide YOU energy for the other 18 or 16 hours of the day.. It's nice to THINK you've solved a problem, but solar is a Daytime PEAKING source. Meaning that the grid demand can be reduced only by the amount that the NOON PEAK is HIGHER than the usage at perhaps 10PM at night. And all the analysis of this "optimization" says that is about 15 to 20% of Daytime peak. Because the summer usage at 10PM is about 80% of Noon Peak. That's where the initial 20% renewable goal came from.
But SOMEONE has to invest in the MAIN GENERATORS that get you thru the night and thru a totally cloudy week like I've had in Tenn for the last 10 days. A week BTW -- where I'd be a solar popsicle if other adults weren't interested in backing up my home solar installation. Probably one of the HIGHEST energy bills for this winter that I'm gonna see.