United Technologies Corp. (UTX:US) added 1.6 percent to $68.49 after rising as much as 2.4 percent, the most intraday since Nov. 9. The maker of power-generation equipment agreed to acquire a 49.5 percent stake in wind-turbine maker Clipper Windpower Plc (CWP:LN) for 166 million British pounds ($270 million) to enter the windpower market.