Federal Reserve Chair Janet Yellen's Congressional testimony set off a market rally and pushed the Dow to notch new intraday and closing records. Yellen said the Fed would likely need fewer rate hikes to reach neutral. The Fed's Beige Book backed Yellen's confidence in economic strength. The U.S. economy grew at a "slight to moderate" pace over the six-week stretch, while wages and inflation rose "modestly." GrubHub (GRUB - Get Report) increased after Cowen upgraded its rating on the food delivery ordering service to outperform from market perform. The firm said demand for online delivery was on the rise, particularly among younger users. NRG Energy (NRG - Get Report) rocketed higher after outlining plans to raise $4 billion through asset sales. The power company also intends to pay down its debt by $13 billion.