The ninth International Conference organized by the Technical Committee n 1 (TC1) of IMACS, ELECTRIMACS took place at Québec City, Canada, from June 9th to 11th 2008. The goal of this conference was to provide scientific and professional interaction for the advancement of the modeling and simulation in electrical power engineering. Approximately, 130 technical papers were presented in the areas of computer-aided design and optimization, control, modeling, simulation and monitoring of power systems, static power converters, electrical machines, electromechanical systems and drives. The IMACS TC1 members wish to express their deepest thanks to Prof. Hoang Le-Huy, Conference Chair, and Prof. Philippe Viarouge, Technical Program Chair, for their relentless efforts resulting in a successful event which took place in the beautiful city of Québec. This special issue of Mathematics and Computers in Simulation proposes 23 papers that were originally presented at the ELECTRIMACS 2008 conference. During the conference, the authors were invented to send a revised version of their paper. The final selection was made after submitting the revised papers to a thorough peer-review process. The Guest Editors express their deepest thanks to all the reviewers and to all the authors, successful or not, who submitted papers and contributed to this Special Issue. Next ELECTRIMACS Conference, will be held in Cergy-Pontoise, France in June 2011.