Investors who were attracted to the brief window of quick-profit opportunity at the end of the last decade will be annoyed to learn that they might have to pay the so-called solar tax even after 2013, when the levy was supposed to have ended. But this will depend on various project parameters, according to the Industry and Trade Minister Martin Kuba. He said that the burden on the economy was so great that the government is being forced to come up with new revenues to pay for it. The high price promised for solar energy spurred the construction of a flurry of solar farms, making it an expensive promise to uphold.