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This paper presents the Colombian Distributed Generation status as a first approach for establishing the interconnection requirements of small-scale generators in the Colombian distribution systems. A national and international standard bibliographical review about this topic was made, and the Distributed Generation technologies available now were identified. This topic has not been explored widely in this country; however, it is becoming an interest area for the regulators entities, because it is considered a great alternative for the electric power supply in Colombia.

In those countries where the electric production chain has been disintegrated, transportation utilities (transmission as well as distribution) are subject to regulation or are under supervised activity. Regulation of activities considered as natural monopolies in network economies requires knowing or assessing efficient capital and operating expenditures (CAPEX and OPEX) depending on the output levels. The problem of determining the tariffs that transmission utilities can charge is tightly related to efficient OPEX levels. This work discusses the use of Data Envelopment Analysis and Stochastic Frontier Analysis to determine efficient frontiers for electricity transmission activity. The results include relative efficiency and productivity indicators, as well as benchmarking peers. This information can be useful to the regulator to foster efficient performance of transmission utilities.