EX-21 16 c72977exv21.htm EXHIBIT 21 Filed by Bowne Pure Compliance
 

Exhibit 21
SUBSIDIARIES OF THE REGISTRANT
U.S. Subsidiaries
                 
Name of Subsidiaries   State of Organization     Trade Names  
 
                
Penn Wilson CNG, Inc.
   Delaware   None
Penn CNG Holdings, Inc.
   Delaware   None
Penn Octane International, L.L.C.
   Delaware   None
Rio Vista Energy Partners L.P.
   Delaware   None
Rio Vista GP LLC
   Delaware   None
Rio Vista Operating GP LLC
   Delaware   None
Rio Vista Operating Partnership L.P.
   Delaware   None