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Distributed generation systems composed of non-renewable and renewable power sources is one of the best approaches for reducing greenhouse gas emissions. Nevertheless, uncontrolled integration of power sources in the distribution system may have negative effects on efficiency and working parameters. Global optimization of distributed generation in the system is not available, but microgrids arrangements make it possible to the design management systems which are able to control their working parameters and give fast responses to internal events without affecting the distribution system. This work presents a new active-power dispatch algorithm capable of adjusting microgrid generation to demand on-line in grid-connected-mode. It also reduces the greenhouse gas emissions to a minimum, and optimizes running costs of microsources. The algorithm uses a heuristic approach based on cost functions of microsources and has been tested to solve different power dispatch cost optimization problems. The results obtained are superior to those obtained by applying state-of-the-art optimization methods, in terms of global cost and emissions, system stability, and computational resources requirements. This reduction of the requirements of computational resources makes it possible to run the algorithm on-line, using an off-the-shelf programmable logic controller or microcontroller. Thus, the infrastructure requirements and new investments are reduced and the penetration of microgrids based on renewable energies is improved.