NEW YORK ( TheStreet) -- Energy Transfer Partners L.P (NYSE: ETP) is trading at unusually high volume Monday with 3.5 million shares changing hands. It is currently at four times its average daily volume and trading up $1.35 (+2.8%) at $49.27 as of 3:15 p.m. ET. Energy Transfer Partners L.P has a market cap of $10.78 billion and is part of the basic materials sector and energy industry. Energy Transfer Partners, L.P. engages in the natural gas midstream, and intrastate transportation and storage businesses in the United States. TheStreet Ratings rates Energy Transfer Partners L.P as a buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth and good cash flow from operations. We feel these strengths outweigh the fact that the company has had lackluster performance in the stock itself. You can view the full Energy Transfer Partners L.P Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.