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Research on reconfiguration focused on the final configuration that reported the lowest losses. However, loads are growing rapidly, which is an important aspect that was not considered. This paper discusses an effective loadability approach to obtain the maximum load that could be added to any network. The main goal of this paper is to minimize power losses, enhance voltage index and achieve the maximum network loadability through simultaneous optimal size and location of distributed-generations (DGs), network reconfiguration and tab changer adjustment. A multi-objective decision approach integrated with weight factors that consider the maximum network loadability with the minimum loss and best voltage profile is the methodology adopted. Firefly (FA) was the selected optimization technique. The weight factors of the optimization function are determined using analytic hierarchy process. To assess the capabilities of the proposed method, simulations using MATLAB software are carried out on different networks. The obtained outcomes prove that integrating optimal placement and sizing of DGs in the system and network reconfiguration incorporating tap changer adjustment simultaneously yields a remarkable enhancement in voltage profile index, the minimum losses and the maximum bus loadability. The active and reactive power loss reductions for scenario 5 are 72.40% and 66.59% for IEEE 33-bus networks. Part of the output results is compared with other published works, and the proposed approach obtains a better result. The results report a high-power loss reduction of 71.55% for IEEE 33-bus systems. The proposed method also produces a better voltage profile compared with other published works. [ABSTRACT FROM AUTHOR]