(Bloomberg) -- The worst-ever Texas wildfire sent shares of Xcel Energy Inc. plunging after a law firm said it might be linked to the disaster, the latest sign that potential ties between power companies and blazes are triggering volatility in once-sleepy utility stocks. Most Read from BloombergTrump Warns of Big Losses From Asset Sales During Property SlumpFed’s Preferred Inflation Metric Increases by Most in a YearStocks End Month at New Highs After Inflation Data: Markets WrapHow Much Wealth