What is holding back the growth of solar power?

. What is holding back the growth of solar power? "...“You have a very strong seasonality in solar production. That is a problem at higher latitudes. If you would connect all the countries around the world then always somewhere the sun would shine and problem solved. But we are still quite far from that situation,” he said. Like other renewables that rely on weather, solar is held back by its “capacity factor”, essentially how often it is producing electricity..."
Reference: www.msnbc.com