Will the sunshine on this solar subsidy?

I spotted this article in the Guardian from a little while back - “The largest rooftop solar power station in the world is being built in Spain. With a capacity of 12 megawatts of power, the station is made up of 85,000 lightweight panels covering an area of two million square feet” It brings into play three important economic concepts - renewable energy as a factor resource, economies of scale in production and also the costs and benefits of government subsidy - Spain has introduced subsidies of €0.42 per kilowatt per hour for investment in solar power - though the level of subsidy may be lowered in the months ahead.