Solar can be an alternative source but not as reliable as most. For example, I would think of geothermal to be more useful, or landfill gas generators.
Also, another thing to consider. If your average power bill is 10 cents, the value of the energy from solar is not 10 cents. If it is a cloudy or rainy day, where will you get electricity? There has to be a generator, transmission line, substations, distribution systems, conversion & protection systems, service people, etc all allocated to still serve you on a rainy day. The actual value of the energy piece is only a part of the 10 cents you pay on average. The top of stack embedded energy may only cost 3 or 4 cents for coal or even a penny or less for nuke.
In Georgia, market energy used to be in the 3 cent range, now it is in the 5 and 6 cent range. If the poco is in the market, they may can avoid some of this 5 and 6 cent energy. The problem is, the solar energy is not a very reliable source so the value is actually less than market. You can buy guarantees with the market energy.
If the poco is facing a market spike of 50 cents/kWh or even $50/kWh. They are going to cut a deal with a reliable source to avoid paying this high price. I don't see how solar can't provide this kind of value, unless it has some way to store the energy. If you can store it, then you can also provide some demand value.