Joint Venture Wins Enron Pipeline Auction  NEW YORK (Reuters) - Enron Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ENRNQ.PK target=/stocks/quickinfo/fullquote"&gt;ENRNQ.PK&lt;/A&gt; on Wednesday  said a joint venture of Southern Union Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SUG.N target=/stocks/quickinfo/fullquote"&gt;SUG.N&lt;/A&gt; and a  General Electric Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GE.N target=/stocks/quickinfo/fullquote"&gt;GE.N&lt;/A&gt; unit won the auction for its crown  jewel U.S. pipelines with a \$2.45 billion cash and assumed debt  bid.