Billionaire Paul Desmarais’ Power Corp. of Canada and its subsidiary, Power Financial Corp., used to live up to their names by powering up their dividends every year. Those hikes stopped when financial markets melted down in 2008 and aren’t likely to resume any time soon. But yield-seeking investors looking for a jolt should consider adding some Power to their portfolios: The dividends may not be growing, but they are compellingly valued nonetheless.