The current power grid is set up to carry power from the current generating sources through a hierarchy of distribution systems to the consumer (i.e., your house).
If the solar panels that are opined are to be installed are on the consumers' houses, how will the power distribution grid need to be changed?
If solar panels are in the desert somewhere, will a new distribution system need to be built (along what right of way?) to carry the electricity from the desert to the consumers?
In other words, don't just look at the power generation source, also look at getting that generated power to the consumer.