Of course wind and solar becomes "efficient" when the state arbitrarily funds and supports it. I am certain there is an entire mafia behind this, from the energy companies all the way to the politicians, ensuring that our public funds flow into their hands and that other forms of energy are properly discredited and taxed.
With a gas power station their is a point at which the fuel is too expensive to compete and the plant is turned off.
With renewable energy the cost is in capital expenditure rather than fuel. It makes sense to run the generator as much as possible, regardless of how little money it makes. In a market dominated by fossil fuels the effective price is therefore always slightly less than the cheapest fossil fuel available. It becomes more valuable as oil or coal prices rise and less valuable as they drop.
Of course that is a ridiculous situation to be in. The only real reason to ever promote renewable energy/ or nuclear is because it is a better product with less negative impact. It is perfectly reasonable that this would cost more than fossil fuel. The only way for a private company to pay off the debt is to charge more than market rates for the energy produced.
Also PV is the simplest, least maintenance power generation source if you need <few KW.