This paper proposes a methodology to identify and assess the impacts of Distributed Generation interconnection in distribution systems, using Monte Carlo techniques. This methodology is composed of two major analysis schemes: a technical analysis, which evaluates the reliability conditions of the distribution system; on the other hand, an economic analysis that evaluates the financial impacts on the electric utility and its customers, according to the reliability level of the system. The proposed methodology was applied to an IEEE test distribution system, considering different operation schemes for the distributed generation interconnection. The application of each one of these schemes, brought significant improvements in the reliability supplied and important economic benefits to the electric utility. However, such schemes resulted in negative profitability levels for certain customers, therefore, it was proposed regulatory measures and bilateral contracts, which would allow to provide a solution to this kind of problems.