The article approaches issues regarding the decisions to invest in projects concerning the area of renewable energy resources. The decisions have been taken on the basis of the cost- benefit analysis. The central issue, that arises inhere, concerns the foundation of the investment decision in terms of an EU funded project through structural funds, if the financial analysis indicators are sufficiently relevant for the decision, or when it should or should not resort to indicators of economic analysis for this, even for private investors, as if these projects should not be financed solely by public beneficiaries as infrastructure projects and not in the context of economic competitiveness, respectively.