That is why we have an Electrical GRID!
They will not be able to sell THEIR generated power, but the power will be made up from the rest of the non-solar powered grid ( gas, oil, coal, nuclear, hydroelectric, wind ..) as far as the consumer goes.
THINK ABOUT IT! The greatest use of power is at NIGHT (depending on season and location ...).
How much solar power is available at NIGHT?
ZERO.
The article is interesting ... but it is NOT NEWS.