By Reuters Staff (Adds power resumed, UMC comment) TAIPEI, May 13 (Reuters) - Taiwan Semiconductor Manufacturing Co Ltd (TSMC), the world’s biggest contract chipmaker, said some of its facilities experienced a “brief power dip” on Thursday after an island-wider power outage, raising concerns that a global chip shortage could worsen. The shortage began late last year and has since affected several industries, from automobiles to smartphones and home appliances, forcing many car makers to halt production lines. It was worsened in recent months by a fire at a chip plant in Japan and blackouts in Texas, where a number of chipmakers have factories.