SAN JOSE -- Calpine Corp. shares surged 21 percent, leading a rally of energy company stocks on optimism their prices will recover after leading declines among U.S. equities last year, analysts said. Shares of Calpine rose 70 cents to 3.96 in New York Stock Exchange composite trading, the biggest one-day rise in almost two months. The company was among the 10 worst-performing stocks on the Standard & Poor's 500 last year along with Dynegy Inc., which rose 9.3 percent Thursday, and Mirant Corp., 8 percent higher. Companies that sell wholesale electricity or trade power and natural gas tumbled in value...