This paper formulates a unit commitment optimisation problem for renewable energy sources distributed in a micro-grid formed by a complex of intelligent buildings of both office and residential characters, including a wide range of amenities. We present a description of the solution of this task using the simulated annealing heuristic optimisation technique. The simple experiment is performed in three different variants of acceptance of balanced power constraining condition. In one of the variants is used fuzzy model of mentioned constraining condition. The experiment was processed in the specialised computer programme. (C) 2013 Elsevier B.V. All rights reserved.