Generators and UPS are current alternatives. However Generators, very loud and expensive to purchase, are dependent on fossil fuel (dirty) prices, which are very low at the moment but fluctuate routinely. UPS devices produce square wave outputs that damage appliances permanently. Convincing the market to go solar instead because of these reasons is the eventual sales challenge for sure.
Transmission losses (including electricity theft) are part of the sales pitch. They are a big reason why Supply doesn't meet Demand and Load Shedding has to be enforced.
Also, midrange UPS don't output square wave, I fact solar systems include a UPS for night time power. So, you could sell a ~3k, UPS system with bult in solar hookups where people can add pannels over time.