In an attempt to cut down the solar boom that hit the Czech Republic in 2009, the government decided last year to hit solar energy producers with a retroactive tax. The 26 percent tax levvied on all solar producers, with the exception of residential rooftop units producing less than 30kw, has been far more successful than anticipated. Ministry of Finance officials expected to pull in roughly CZK 4.3bn for the depleted state coffers, but it’s managed to collect CZK 5.9bn. State subsidies fueled a boom in the development and construction of solar energy farms that now dot the countryside.